Pipe Final Coaching

The type of condenser combines the functions of condenser and cooling tower is called Answer: Evaporative Condenser An expansion valve with fluid charge remote valve that maintains a constant degree of superheat in the evaporator is called

A constant restriction expansion device in refrigeration system which is a long tube with narrow bore is called Answer: Capillary Tube Mixtures of refrigerants that which behave like pure substance are called

Answer: Thermostatic Expansion valve

Answer: Azeotropes

A refrigeration system ideally suited for use in air craft because it is light in weight and requires less space is called

In refrigeration compression that has an electric motor and the compressor built into an integral housing is commonly called

Answer: Air Cycle

Answer: Hermetic Compressor

Refrigerant with chemical formula CHCLF 3 is designated by

Compounds with the same chemical formula but different molecular structure such as R – 134A and R – 134 are called

Answers: R-22 Refrigerant with chemical formula CF3CH2F is designated by Answer: R-134A Carbon Dioxide refrigerant is designated by Answer: R-744 Piping, fittings and valve materials found suitable for use in Ammonia refrigerant are manufactured from Answer: Iron and Steel Which statement is incorrect with WaterCooled Shell – and – Tube type of Ammonia Answer: Water flowing through passes inside tubes and the refrigerant condensing in the shell In Vapor Absorption Refrigerant system utilizing ammonia as refrigerant and the absorbent is Answer: Water The most common secondary refrigerant medium used in indirect refrigeration system such as in industrial ice plants and cold storages Answer: Brine

Answer: Isomers An expansion valve used for flooded type of evaporator in a refrigeration system is called Answer: Float Valve An atom in the refrigerant molecule consider responsible for the depletion of ozone layer in upper atmosphere (stratosphere) Answer: CL Atom A vapor compression system used for production of low temperature in which a series of refrigerant with compressively low boiling point are used in series of single stage units is called Answer: Cascade System Which statement is correct on the effect of liquid subcooling in a vapor compression system Answer: Subcooling decreases the flashing of the liquid during expansion and increase the refrigerating effect Which statement is correct on the effect of suction vapor superheating in a vapor compression system Answer: Superheating both increases specific compressor work and refrigerating effect

Which statement is correct on the effect of increasing condensing pressure in a vapor compression system Answer: Increasing condensing pressure increases specific compressor work and decreases the refrigerating effect Freezing method utilizes the combined effect of low temperature and high air velocity to produce a high rate of heat transfer from products Answer: Blast Freezing A component installed a refrigeration system to ensure that no liquid enters the compressor and subcooled the liquid from condenser to prevent bubbles of vapor from impending a flow of refrigerant through expansion valve is called Answer: Liquid Exchanger

to

Suction

Heat

Refrigerant used in steam jet refrigeration is

Which refrigerant is completely miscible with oil Answer: R – 12 Ammonia is not used in domestic refrigeration and comfort air conditioning because Ammonia

A very important consequence of ideal gas model is that the internal energy of an ideal gas is a function of __________ only Answer: Temperature At what temperature do the Fahrenheit and Celsius scales have the same value Answer: - 40 degrees States that if the temperature of a given quantity of gas is held constant, the volume of the given gas varies inversely with absolute pressure during the change of state Answer: Boyle’s Law A unit of force that produces unit acceleration in ft/sec2 and in a unit of mass in lbs Answer: Poundal Why does the cube of ice float in water? Answer: The density of ice is lesser that water

Answer: Water

Answer: toxic

Answer: Solenoid Valve

is

flammable

and

Refrigerant – 22 which is an HCFC has 1/20 th the ozone depletion potential (ODP) of R – 11 and R – 12, hence it can be continue to be use for quite sometime however all these have global warming potential (GWP) because of this R – 22 will have to be phase out by year Answer: 2030 AD Which of the following is incorrect regarding the function of the liquid receiver Answer: Stores oil that is carried along the refrigerant Shut – off valve that is actuated by an electro – magnetic coil is called

The work done in fusion a fluid across a boundary usually into or out of the system is called Answer: Flow Energy States that energy is neither created nor destroyed but it can only change in forms Answer: 1st Law of Thermodynamics Heats is defined as form of energy that is transferred between two system by the virtue of __________ Answer: Temperature Difference The usual energy transferred in BTU/hr provided by input of power in Watts, this is just the coefficient of performance expressed in mixed units Answer: Energy Efficiency Ratio (EER) If EER is the energy coefficient ratio the COP is the coefficient of performance then Answer: EER = 3.41 COP

Which of the following is the reverse rankine vapor cycle Answer: Vapor compression Cycle The most common type refrigeration application in household refrigerators, air conditioning for cars and houses, chillers and so on Answer: Vapor Compression Cycle Which of the following is a reversed Brayton Cycle Answer: Air Refrigeration Cycle

Coolers and chillers for water generally operates with an average temperature difference of Answer: 3 0C to 110C To avoid freezing refrigerant should be

problems,

entering

Answer: Above -2 0C Suction line should not be filled to large as reasonable velocity which needed to carry oil from the evaporator back to the compressor for horizontal suction lines, the recommended minimum velocity is

Which of the following cycle is bulky and involves toxic fluids hence it is unsuitable for home and autopulling

Answer: 3.8 m/s

Answer: Absorption Cycle

Type of turbine used for low heads, high rotational speed and larger flow rate

Which of the following refrigeration cycle is practically when large quantity of waste or inexpensive heat energy area available Answer: Cycle

Heat

–

Driven

Refrigerating

A product of computer aided manufacturing and precision machining when introduce commercially in the late 1980’s as replacement for reciprocating compressors in small residential air conditionings Answer: Scroll Compressor Condenser used in small and medium size up approximately 100 tons of refrigerators Answer: Air – Cooled Condensers For efficient operation the condensing temperature should not be lower than Answer: 5 degrees Celsius For efficient operation the condensing temperature should not be more than Answer: 17 degrees Celsius Condenser used refrigerators

for

larger

Answer: Axial Flow Turbine To keep the deflected jet out of the way of the incoming jet, the actual angle is limited to approximately Answer: 165 degrees Which of the following turbines are centrifugal pumps operating on reverse Answer: Reaction Turbine Also known as Francis Turbine or Radial Flow Turbine Answer: Reaction Turbine The turbine draft tube and all related part comprise what is known as Answer: Setting When forbay is not part of generating plant design, it will be desirable to provide a _______ in order to relieve the effect of rapid changes in flow rate Answer: Surge Chamber

capacity

Answer: Water – Cooled Condensers

To keep the deflected jet out of the way on the incoming jet, the actual angle is limited to approximately Answer: 165

0

The minimum fluid energy required at the pump inlet for satisfactory operation is known as Answer: NPSHR Throttling the input line to a pump and a venting evacuating the receiving pump Answer: Both increase cavitation Traditional reciprocating pumps with pistons and rod can be either single acting or double acting and or suitable up to approximately

A close heat exchanger that transfer heat from compressed air to cooler air Answer: Aftercooler At the control stand, each of the turbine blades must be adjusted manually by a Answer: Sensor The most commonly used adjusted blade propeller turbine Answer: Kaplan Turbine

Answer: 2000 psi

Runner blades are adjusted automatically in synchronization with turbine wicket gates by

Plunger pumps are only single acting are suitable up to approximately

Answer: Oil Servomotor

Answer: 10000 psi

What is applied to the servomotor from the turbine governor oil system through a generator shaft and through a control valve

The ratio of the actual to ideal heat transfer coefficient

Answer: Oil

Answer: Cleanliness Factor The ratio of the maximum and minimum mass stream flow rates at which the temperature can be accurately contained by the desuperheater Answer: Turndown Ratio With the reversible generator, the thermal efficiency of ericsson cycle is _______ to that of the carnot cycle Answer: Equal Use to describe the act of flowing the exhaust product cut with air fuel mixture Answer: Scavenging Which of the following compresses and increases the amount of air that enters the cylinder per stroke Answer: Supercharging A form of supercharging in which the exhaust gases drive the supercharger Answer: Turbocharging

Used to exhaust air from the casing for starting Answer: Ejectors Advantageous for propeller turbine of all types Answer: Siphon Setting Turbine setting where one disadvantage is a difficulty of lubricating operating mechanism with consequent relatively rapid wear Answer: Open Flume Setting A patent device combining expansion and compression function in a single rotor permitting higher cycle temperature Answer: Comprex A rough measure of physical sides of the equipments with must handle the specified quantity of the fluid Answer: Air Rate The ratio of the highest mean compressor discharge pressure to the lowest mean compressor inlet pressure

Answer: Cycle Pressure Ratio

Answer: Grand Sensible Heat Ratio

The ratio of the maximum pressure in the cycle to the atmospheric pressure

The slope of the line between the apparatus dew point on the saturation line and to design conditions of the condition space

Answer: Cycle Pressure Level The ratio of the actual partial pressure exerted by the water vapor in any volume of air to the partial pressure that would be exerted by the water vapor if the water vapor in the air is saturated at the temperature of the air Answer: Relative Humidity An expression of the mass of water vapor per unit mass of dry air is Answer: Humidity Ratio Which of the following is equivalent to 1 lb Answer: 7000 grains The locus that states that have the same value of stagnation enthalpy and mass flux is called

Answer: Effective Sensible Heat Ratio The sensible heat ratio is a Answer: Psychrometric Slope The percentage of the air that is not cold or heated is Answer: Bypass Factor The bypass factor for large commercial units Answer: Around 10% The bypass factor for residential units are approximately Answer: 35% The compliment of the bypass factor is Answer: Coil Efficiency

Answer: Fanno Line Combining the conservation of mass and momentum equation into a single equation and plotting it on the h – s diagram yield a curve called

The mass of water sprayed to the mass of air passing through the washer per unit time

Answer: Rayleigh Line

In cooling tower, the water passes over staggered flats or interior fills also known as

Across the shaft, the stagnation temperature of an ideal gas Answer: Remains Constant The locus of point where condensation will take place regardless of initial temperature and pressure at the nozzle entrance Answer: Wilson Line The enthalpy of a substance at specified state due to its chemical composition Answer: Enthalpy of formation Since the air – conditioning apparatus usually removes heat and moisture from both the conditioned room and from outside make – up air, the sensible heat ratio that can be used is

Answer: Spray Ratio

Answer: Packing The ratio of total dissolve solids in the recirculating water to the total dissolve solids in the makeup water Answer: Ratio of Concentration Through windage removed some of the solids most must be removed by bleeding some of the water off, this known as Answer: Drift A Tri – cooling tower where steam travels through large diameter ‘Trunks’ to a cross flow heat exchanger where it is condense at cooling by the cooler air

Answer: Direct Condensing Tower Which of the refrigerant of choice in uniting air – conditioners Answer: R – 22 In new equipment, which of the following replaces R – 11?

temperature, average efficiency are only?

annual

thermal

Answer: 10-15 % A filled of heliostats or tracking mirrors concentrates solar energy into a receiver on a central tower? Answer: Power Tower System

Answer: R – 123 New combustion turbines on cutting edge of technology (advance turbine system) are available to achieve Answer: 38 – 38.5% How many percent of solar energy survives absorption and reflection? Answer: 40 – 70% Which of the following collect used mirrors and over or lenses to focus the suns energy in a small absorber area? Answer: Concentrating Collectors Which of the following collectors are useful when extremely hot transfer fluid is needed and or generally limited to commercial project? Answer: Evacuated Tube Collectors

In a power tower system typical thermal efficiency is in the range? Answer: 15 to 20 % A flash steam cycle can be used in hot water temperature is approximately? Answer: 165 degrees C or higher A binary cycle using separate heat transfer fluid which the temperature of the cooling water is between approximately? Answer: 165 and 120 degrees C In hot rock system water is injected through injection wells into artificial made fracture rock of how many km below the surface? Answer: 1 to 6 km What temperature is required to ignite the fuel oil?

The ratio of energy absorbed by the transfer fluid to the original incident energy striking the collector

Answer: 800 to 1000 degrees F

Answer: Collector Efficiency

What air pressure is required to produce the required ignition temperature?

The shading factor in calculating the heat absorbed by the solar collector has a value approximately

Answer: 350 to 500 psi

Answer: 0.95 to 0.97 Which of the following approaches to the solar energy generating systems describe the parabolic tracking though concentrators focus sunlight on the evacuated glass tubes that run along the collectors focal line? Answer: Through Electric System Through electric relatively mature

energy technology is but due to the low

The portion of the piston which extends below the piston pin and serve as a guide for the piston and connecting rod? Answer: Piston Skirt Binding of the piston and the cylinder wall as the result of the lubrication having been destroyed by excessive temperature and friction? Answer: Piston Seizure

Combination of liquids which do not mixed or combined chemically?

Is that rely on natural draft are sometimes referred to as:

Answer: Emulsion

Answer: Gravity chimney

At what temperature cartridge ignite?

will

self

igniting

For realistic problems the achievable stack effect probably should be considered to be?

Answer: about 190 degrees F

Answer: 80% of the ideal

A fuel is supplied by a single pump and switch to which cylinder by a multi outlet rotating valve or distributor?

In a balance system, the available draft is?

Answer: Distributor System

It is a device use for atomizing or cracking fuel oil and trough which a fuel oil is injected into the working cylinder of diesel engine?

A chamber so designed that injection takes place directly opposite its outlet the chamber extending backward from the outlet? Answer: Ante combustion chamber A cylindrical vessel connected in the fuel system to absorb the shaft of the injection pump and to provide a reservoir at high pressure for supply an even flow of fuel to the cylinders? Answer: Accumulator Which of the following is used to improve cold weather starting? Answer: Glow plug

Answer: 0 (zero)

Answer: Atomizer What is the proper seat width of a spray valve? Answer: 1/16 in. A device which automatically governs or controls the speed of engine? Answer: Governor The term enthalpy? Answer: Will measure by its change, the quantity of heat added when refrigerant is vaporized at constant pressure.

The rated power that the manufacturer claims to engine is available to provide or a continues basis without incurring damage?

When heat is added to moisture air in an air conditioning process?

Answer: Continuous duty rating

Answer: the absolute humidity remains constant

The peak power that can be produced on an occasional basis? Answer: Intermittent Rating A value of a property that include the effect of friction is knows as? Answer: Brake value Forced draft fan are run at relativity high speed the range of? Answer: 1200 to 1800 rpm

Air having a relative humidity of 50% is heated in an air conditioning apparatus after having it will be found that? Answer: its absolute humidity remains constant The ton of refrigeration equivalent to?

is

a

heat

unit

Answer: 12000 Btu/hr In the process of heating atmospheric air in an air conditioning apparatus? Answer: the absolute or the specific humidity remains constant

The temperature at which the vapor in the mixture is cooled at constant pressure is called? Answer: Dew point temperature Refers to the amount of air that has not been in contact during the sensible cooling process in the surface of the cooler coil? Answer: coil bypass factor The process that the body uses to convert energy into heat and work or the process that determines the rate at which energy is converted from chemical to thermal form within the body? Answer: Metabolism It is a body in insulation that is usually describes as a single equivalent uniform layer over the whole body? Answer: Clothing It is the basic index used to describe the radiant conditions in a space. It is the mean temperature of individual exposed surfaces in the environment? Answer: Mean radiant temperature It is the most common instrument used to determine the mean radiant temperature. It consist of a hollow sphere 6 inches in diameter flat lock paint coating and a thermocouple or thermometer valve at its center? Answer: Vermon’s globe thermometer It is the mechanism of heat transfer between parts of a continuous because of transfer of energy between particles or group of particles the atomic level, it is the mode of heat transmission through the building structure like the wall due to the temperature diff. between surface of the wall? Answer: Thermal conduction It is a transport of energy by mixing in addition to conduction. It is associated with fluids in motion generally through a pipe or duct along a surface? Answer: Thermal convection

A form of thermal convection when the fluid is moving relative to transfer surface because such usually caused by a blower fan or forcing the flow

the bulk of the heat motion is pump that

Answer: Force convection A form of thermal convection when the motion of the fluid is due to entirely to buoyancy forces usually confined to a layer near a heated or a cooled surface? Answer: Free convection A mode of heat transfer by the electro magnetic waves an entire diff. phenomenon from conduction and convection it can occur in perfect vacuum and its usually impeded by an intervening medium? Answer: Thermal conduction radiation An envelope area with significantly higher rate of heat transfer than the contagious enclosure is called? Answer: Air conditioned room It is the total thermal radiation that impinges on a surface from all direction and all sources Answer: Total or Global irradiation Transformation of the radiant energy into thermal energy stored by molecules is known as? Answer: Radiation It is a return of radiation by a surface w/c change of surface frequency the radiation is bounced off the surfaces? Answer: Reflection In a refrigeration system the heat absorb in the evaporator per kg of refrigerant passing through? Answer: Equals the increase in enthalpy It is the passage of radiation through a medium w/o change of frequency? Answer: Transmission

It refers to any glaze aperture in a building envelope the components of each include glazing material either glass or plastic flaming mull ones, muntins and dividers external shading devices and integral shading system between glass? Answer: Fenestation The rate at which energy is transferred to or generated within a space is called? Answer: Heat gain It is the rate at which energy must removed from a space to maintain the temperature and humidity at the design values? Answer: Cooling Load It is the rate at which energy removed from a space by cooling and dehumidifying equipment. This rate must be equal to the cooling load when the space conditions are constant when the equipment operating? Answer: Heat extraction rate It is a computer or hand circulation procedure where energy requirement are determine at many outdoor temp, conditions. It is used for the energy calculation of air conditioning system? Answer: Bin method It is the temperature of uniform environment at 100% relative humidity in which a person or occupant losses the same total amount of heat from the skin as in the actual environment? Answer: Humid Operative Temp. It is the ratio of the total evaporative heat loss required for the thermal equilibrium to the maximum evaporative heat loss possible to the environment multiplied by 100 for the steady state conditions and with the skin temperature constant at 95%? Answer: Heat stress index It is the temperature of a uniform environment at 0% relative humidity in which a person or occupant causes the same total

amount of heat from the skin as in the actual environment? Answer: temperature

Adiabatic

equivalent

Heat added to or removed from a substance that causes a change in temperature? Answer: Sensible heat It is an environment heat stress index that combines the dry bulb temperature a naturally ventilated wet bulb temperature and the globe temperature? Answer: Wet bulb globe temperature It is an empirical index for the combined effect of wind and low temperature? Answer: Wind chill index A method of air handling to air conditioned room that produces more economical performances as compared with system where heat might be required is called? Answer: Re-circulated air with external bypass It is the ratio of the air humidity ratio to the humidity ratio of saturated air at the same temperature? Answer: Percent saturation It is the ratio of the actual partial pressure of vapor and the saturation pressure vapor corresponding to the actual temperature of the mixture? Answer: Humidity ratio Heat gain or heat loss due to the temperature diff. across the building element? Answer: Transmission 1 ton of refrigeration is equivalent to? a. b. c. d.

12000 BTU/hr 50.4 kcal/min 200 BTU/ min All of the above

Air whose condition is such that any decrease in temperature will result in condensation of the water vapor into liquid? Answer: Saturated air The binary mixture of dry air and water vapor is known as? Answer: Moist air In compressing air in water jacketed air compressor the power required to drive it? Answer: depend on the temperature change of the air for a given pressure range.

Answer: Evaporation The common term for process using only pressure suction or decantation Answer: Dewatering The process of removing moisture in varying amount from solids or semi fluid material. The process may be accomplished by pressure suction decantation or evaporation Answer: Drying

An instrument used in the study of the properties of air?

A type of dryer that may have to flame from combustion impinging on the material being dried or the gasses of combustion may be mixed with additional air so that mixture in contact with the material is reduced in temperature

Answer: hydrometer

Answer: Direct Type Dryer

The difference between dry bulb and the wet bulb temperature?

The most commonly used dryer that consist of a rotating cylinder inside each the material so while getting in contact with hot gasses, the cylinder is tilted at the right angle and fitted with lifting flights. This dryer is used for copra, sand or wood chips

Answer: Wet bulb depression The transmission of heat from one place to another by fluid circulation between spots of different temperature is called? Answer: Convection A machine or equipment used for drying process? Answer: Dryer Water occurring when chemical component of the material changes its chemical composition by heat or other means is called Answer: Chemically combined water A wet type mechanical classifier (solid separator) in which solids settles out of the carrier liquid and are concentrated is known as Answer: Dewaterer A term used for describing the moisture in the mass that is not on the surface of material Answer: Inherent Moisture The main principle of the term drying process

Answer: Rotary Dryer A dryer where the material is in contact with steam pipes or the air is passed over steam heaters and then over or to the material being dried Answer: Steam Heated Dryer A dryer that consists of a centrifuge revolving at high speed causing the separation by centrifugal force of the water from the material. This dryer is used for drying fertilizer, salt and sugar Answer: Centrifugal Dryer A Dryer type in which material to be dried is supported on a floor through which the hot gasses passed, this dryer is used for copra, coal and enamel wares Answer: Hearth Dryer Those substance that are particularly variable in the moisture content that they can passes at different times

Answer: Hygroscopic Materials

Answer: 23% O2

The hygroscopic moisture content of a substance expressed as a percentage of the bone dry weight of the material

An instrument used to determine the specific gravity of a solution

Answer: Regain A dryer that consists of a trace carrying the material to be dried placed in compartment or moving conveyor, this type of dryer is used for ipil – ipil leaves and grains Answer: Tray Dryer 1 ton of refrigeration is a heat equivalent to

Answer: Hydrometer The type of heat that changes the physical state of a substance Answer: Latent Heat Refers to the temperature at which all molecular motion ceases according to the kinetic theory of heat Answer: Absolute Zero

Answer: 12000 BTU/hr A type of dryer that consists of a vertical shaft in which the wet feed is introduced at the top and falls downward over baffles while coming in contact with the hot air that rises and exhaust at the top. This type of dryer is used for drying palay wheat and grains Answer: Tower Dryer The temperature to which air must be cooled at constant pressure to produced saturation is called Answer: Dew Point The mass of water vapor per unit volume of air Answer: Absolute Humidity When the expansion of compression of gas takes placed without transfer of heat to or from the gas the process is called

Is one whose temperature is below the saturated temperature of one gram of water to 1 degree? Answer: Subcooled Weight per unit volume is termed as Answer: Weight Density Measure of hotness or coldness of the body Answer: Temperature The temperature at which the water vapor in the air begins to condense or the temperature of which the relative humidity of air becomes 100 % Answer: Dew Point It consist of a wet and dry bulb thermometers mounted on a strip of a metal

Answer: Adiabatic

Answer: Sling Psychrometer

Weight per unit volume is termed as

A manometer is an instrument that is used to measure

Answer: Weight Density The designed of an air supplied duct of an air conditioning system Answer: Affects the distribution of air Atmospheric pressure at sea level is Answer: 14.7 psi Air contains by weight

Answer: Air Pressure The relationship of water vapor in the air at the dew point temperature to the amount in the air if the air is saturated at the dry bulb temperature is Answer: Point

Partial

Pressure

Actual

Dew

All of the following statements about WB temperature are true except Answer: WB temperature lies numerically between dew point and dry bulb temperature for unsaturated system Heat added to or removes from a substance that causes a change of temperature? Answer: Sensible heat In a sensible heating process, humidity ratio is?

the

final

Answer: the same In an adiabatic saturation process, the final relative humidity is?

Answer: refrigeration The process of treating air so as to control simultaneously its temperature humidity cleanliness and distribution to meet the requirement of the condition phase? Answer: Air-conditioning An appliance used to dehumidifying air in homes and buildings which uses refrigerant unit? Answer: Dehumidifier A component of vapor compression refrigerant system which is used to compressed refrigerant vapor from evaporator to the condenser? Answer: Compressor

Answer: Increase Cooling and dehumidifying commonly used for?

process

is

One of the components at the high pressure side of the vapor compression refrigerant system?

Answer: Summer Air-conditioning

Answer: Condenser

An adiabatic saturation process is also known as?

The thermal state of a body considered with reference to its ability to communicate heat to the other bodies?

Answer: process

Constant

WB

temperature

Answer: Temperature

The process of simultaneous heating and dehumidifying is known as?

A form of energy that flow at higher temperature body to lower temperature body

Answer: Chemical Dehumidifying

Answer: Heat body

The process of increasing the dry bulb temperature without changing the humidity ratio is known as?

A thermodynamic quantity that measured the fraction of the total energy of a system that is not available for doing work?

Answer: Sensible heating

Answer: Entropy

The process of cooling without changing the humidity ratio is as known as?

The total volume of a mixture of gases is equal to the sum of the volume that would be occupied by the various components each at the pressure and temperature of the mixture?

Answer: Sensible cooling The process of simultaneous heating and humidifying is known as? Answer: Heating and Humidifying The process of cooling and maintaining the temperature of space or material below its surrounding?

Answer: Amagat’s law The total pressure of a mixture of gases is the sum of the pressure that each gas would exert for it to occupy the vessel alone at the volume and temperature of the mixture? Answer: Dalton’s law of partial pressure

The total ratio of the actual partial pressure of vapor and saturation pressure of vapor corresponding to actual temperature of the mixture? Answer: Humidity ratio Steady flow process at total pressure to a control volume for which there is no heat and in which a liquid and the gas flowing to a right at a local equilibrium state containing saturated vapor before the exit section is reached? Answer: Adiabatic saturation process The actual temperature of air which is measured by an ordinary thermometer or the temperature of the gas or mixture of gases indicated by an accurate thermometer after correction for radiation?

Answer: Dew point temperature The ratio of the air humidity ratio to the humidity ratio of saturated air at the same temperature? Answer: Percent saturation At constant temperature the absolute pressure of gas varies inversely as its volume? Answer: Boyle’s law At constant pressure the volume of gas is proportional to its absolute temperature at constant volume the pressure is proportional to its absolute temperature? Answer: Charles’s law A part of refrigerating unit in which refrigerant vaporizes to absorb heat?

Answer: Dry bulb temperature

Answer: Evaporator

An instrument of two thermometers one used to measure the dry bulb temperature and other one used to measure wet bulb temperature of air?

A part of refrigerating unit in which refrigerant undergoes transformation from gas to liquids?

Answer: Barometer

If the dry and wet bulb temperature readings of the sling psychrometer are identical?

In an adiabatic saturated process the relative humidity is? Answer: Increase The ratio of the mass of water vapor and the mass of dry air in the mixture? a. b. c. d.

humidity ratio specific humidity mixing ratio all of the above

The sum of the internal energy and the product of pressure and specific volume? Answer: Enthalpy The temperature at which the condensation of water vapor in space begins? Answer: Dew point temperature The temperature of moist air which is equal to the saturation temperature of the partial pressure of the vapor?

Answer: Condenser

Answer: The air is saturated The temperature at which the water vapor in the air begins to condense or the temperature at which the relative humidity of the air becomes 100%? Answer: Dew point temperature Refers to the temperature at which all molecular motion ceases according to the kinetic theory of heat? Answer: Zero absolute temperature Heat gain or heat loss due to the temperature difference across a building elements? Answer: Transmission Heat gain due to transmission of solar energy through a transparent building component or absorption by an opaque? Answer: Solar

A mixture of oxygen and nitrogen plus small amount of rare gases such as argon is known as? Answer: Air What is the insulating value of clothing? Answer: Clo units If two identical centrifugal pumps are installed in series, the system flow rate? Answer: Remains the same The formation at collapse of vapor bubbles that occurs when pump inlet suction pressure falls to or below the vapor pressure of the liquid is called? Answer: Cavitation The process done in centrifugal pump by a filling up the suction line and pump casing with liquid to removed air or vapors from the water waste of the pump is called? Answer: Priming Which term does not belong to the group? Answer: Diaphragm pump The power output of the plant depends on the water flow in the river at low river flows, the output decrease accordingly? Answer: Run-of-River Plant A kind of fluid flow where in the fluid travels parallel to the adjacent layers and the paths of individual particles do not cross or intersect? Answer: Laminar flow This is a type of reaction turbine usually with typical spiral casings where water enters the runner radically at its outer peripheral and changes direction (imparting energy to the runner) while flowing along the complex shape profiles to discharge axially. It is the most widely used type of hydraulic turbine for modern powered generation process? Answer: Francis Turbines

It is the expanding tube connecting the outlet passage of turbine with the tail water? Answer: Draft tube It is hydro-electric plant in which excess water pump to an elevated space during off peak period and the stored water will be used to dry hydraulic turbine during the peak period to meet peak demand? Answer: Pump storage plant It is channel the conducts water away from the turbine? Answer: Tail race This is a grid or screen compose of parallel bars to catch floating debris. It prevents, leaves broaches and other water contaminant from entering the penstock? Answer: Trash pack It is the term used that refers to water in the reservoir? Answer: Head water This is a propeller type reaction turbine with both adjustable guide vanes and runner blades? Answer: Kaplan turbine It is basically hydro-electric power utilizing the difference in elevation between high and low tide to produced energy? Answer: Tidal power The intake pipe to a hydraulic turbine to a dam? Answer: Penstock Conducts the water around the turbine? Answer: Spiral casing These are removable vertical vanes that are actuated by the governor to control the flow of water and therefore the energy supplied to the runner Answer: Wicket gate

The speed of hypothetical model turbine having the same configuration as the actual turbine when the model would be of the proper size to develop 1 HP at the head of 1 ft

The information and collapse of vapor bubbles that occurs when the pump inlet suction pressure falls to or below the vapor pressure of liquid is called

Answer: Specific speed

Answer: Cavitation

The difference in elevation between the head water and tail water or tail race

A property of lubricating oil that measures the thickness of the oil and will help determine how long oil will flow at a given temperature is known as

Answer: Gross Head The ratio of the effective head to the gross head Answer: Penstock Efficiency The ratio of the head utilized to the effective head Answer: Hydraulic Efficiency Heads between 70 and 800 ft generally indicate this type of turbine Answer: Reaction Turbine Heads below about 70 ft fall this type of turbine Answer: Propeller Turbine The functions of this hydraulic turbine part are [1] it enables the turbine to be set above the tail water level without losing any head thereby and [2] it reduces the head loss at the merge discharge to increase the net head of available to the turbine runners Answer: Draft Tubes It is a tank with free surface provided at the transition from the low pressure head raise or tunnel to the penstock it protects the head raise pipe or tunnel from excessive changes in pressure in supplying or storing water as required Answer: Surge tank

The rotating part of the turbine where the water impart its energy into the turbine shaft Answer: Runner

Answer: Viscosity A flow at low Reynolds number with smooth stream lines and shear and conduction effects flowing entirely to the fluids molecular viscosity and conductivity Answer: Laminar The fact that the buoyant force of the floating object is equal to the weight of displaced liquid is known as Answer: Archimede’s Principle The primary purpose of a turbine in a fluid loop is to Answer: Extract Energy from the flow It provides an efficient safe means on releasing flow water that exceeds the design capacity of the dam Answer: Spill way The power required to deliver a given quantity of fluid against a given head with no losses in the pumps Answer: Hydraulic Power The velocity of fluid is zero at the wall and the maximum at the center because of the Answer: Viscous effect The work termed for pumps, compressor, fans and blowers is negative since work Answer: done on the fluid This is a type water turbine where a jet of water is made to fall in the blades or buckets and due to the impulse of water, the turbine will start moving

Answer: Pelton Wheel Turbine A device used to prevent water hummer in turbine

It is an air pollution control device that works by electrically charging the particles of fly ash in the flue gas and collecting them by attraction to charge metal plate

Answer: Surge tank

Answer: Electro static precipitator

It is a vent or hole in the earth surface usually in volcanic region from which stream gaseously force or hot gases issue

This nuclear reactor component which is made up of carbon and beryllium slows down the fast neutrons that are born during the fission process

Answer: Fumarole The typical depth of geothermal production well in meters Answer: 3000 A wind energy system transforms the _______ of the wind into mechanical or electrical energy that can be harness for practical used Answer: Kinetic Energy It is the rhythmic rise and fall of the ocean water Answer: Tide The power available in the wind proportional to the ________ of its speed

is

Answer: Cube It is the maximum tidal range Answer: Spring Tide Natural gas is considered ________ when it is almost pure methane Answer: Dry Also known as brown coal, it is the lowest rank of solid coal with the calorific value of less 8300 BTU/lb on a moist mineral matter free basis Answer: Lignite In this type of reactor the water is heated by the nuclear fuel and boils to steam directly into the reactor vessel it is then pipe directly to the turbine, the turbine spins driving the electrical generator producing electricity Answer: Boiling Water Reactor

Answer: Moderator This boron coated steel rods are used to regulate the rate of fission chain reaction they are withdrawn from the core to start a chain reaction and inserted all the way into the core to stop it Answer: Control rods In general usage the term combine cycle plant describes the combination of a gas turbines generator ________ cycle with turbine exhaust waste boiler the steam turbine generator (Rankine Cycle) for the production of electric power Answer: Brayton Natural gas is a fossil fuel formed when the layers of buried plants and animals are exposed to intense heat and pressure. It has been club as the fuel of the future or green fuel and comprises mainly of Answer: Methane If fall ash that exits the combustion chamber in the flue gas and is captured by air pollution control equipment such as hydrostatic precipitators, bag houses and wet scrubbers Answer: Fly Ash It means using the same energy source for more than one purpose such as using the waste heat from an engine for space heating Answer: Cogeneration The minimum amount of air required for the complete combustion of fuel Answer: Stoichiometric Air

The device or instrument used for measuring the calorific value of a unit mass of fuel is called Answer: Calorimeter When water in the products of combustion is in the vapor or gaseous form the heating value is known as Answer: Lower Heating Value The percent excess air is the difference between the air required divided by Answer: the theoretical air supplied During the combustion process the components which exists before the reaction are called

Why does older type of economizers where constructed in variable of cast iron Answer: because cast iron resist corrosion better than mild steel and the pressure where comparatively low It is an accessories often installed on modern boilers to preheat air for combustion before it enters the boiler furnace Answer: Air Preheater What components are included approximate analysis in solids fuel?

in

the

Answer: Fixed Carbon, Volatile Matter, Ash and Moisture Which element of fuel is not combustible?

Answer: Reactants

Answer: Oxygen

The minimum amount if air needed for the complete combustion of fuel oil is

A device or an instrument used to recover the cylinder pressure of an engine piston travel in an x – y graph where pressure forms the vertical axis and piston travels forms the horizontal axis

Answer: Theoretical Air A gas which will not be found in the flue gasses produced from the complete combustion of fuel oil is Answer: Hydrogen The higher heating value is determined when the water in the product of combustion is in Answer: Liquid form The amount of heat liberated by the complete combustion of a unit weight or a volume of fuel is known as

Answer: Engine Indicator This diagram is used by the operating engineer to determine leaky piston packing, sticking piston, incorrect valve timing, loosing bearings restricted and or outlet piping, etc Answer: Indicator Diagram The effective weight of the brake arm when the brake bond is lose Answer: Tare Weight

Answer: Heating Value

The power output of the generator

An atemporator is another name for

Answer: Electric Power

Answer: Desuperheater

The amount of fuel needed to perform a unit of power

What is the fundamental indicator of good combustion? Answer: presence of minimum oxygen, maximum carbon dioxide and nitrogen combustibles in the flue gas It is a solidified mass of fused ash Answer: Carbon Residue

Answer: Specific Fuel Consumption The ratio of heat converted to useful power to the heat supplied Answer: Thermal Efficiency The ratio of actual power of the engine to its ideal power

Answer: Engine Efficiency The ratio of the cylinder volumes after and before the combustion process Answer: Cut – off Ratio

The power develop in the engine cylinder as obtained from the pressure in the cylinder Answer: Indicated Power

The position of the piston when it forms the smallest volume in the cylinder

The pressure and torque spent in overcoming friction of reciprocating and revolving parts of the engine and the automobile before it reach the drive shaft.

Answer: Head End Dead Center Position

Answer: Friction Power

The position of the piston when it forms the largest volume in the cylinder Answer: Crank End Dead Center Position When four events takes place in one revolution of a crank shaft of an engine, the engine is called Answer: Two stroke cycle engine What is the model cycle for spark ignition engine? Answer: Otto Cycle

Answer: Cetane no.

It is the indicator used to determine the anti knock characteristics of gasoline Answer: Octane Number

Answer: Fuel Transfer Pump

The distance that the piston can travel in one direction Answer: Stroke

Acts as a balancer and provide momentum during dead stroke in a cycle Answer: Flywheel

The minimum volume formed in the cylinder when the piston is at the top dead center Answer: Clearance Volume

Passage of coolant from the engine block to the cylinder head Answer: Water jacket

Answer: Mean Effective Pressure The ratio of constant pressure specific heat to the constant volume specific heat

Are used to cool incoming air so that the volume of air available is inc. Answer: After cooler

Answer: Specific Heat Ratio compression

Are steel tubes with sit at both end and bridge the motion from cam shaft to rocker arm? Answer: Push rod

It is a fictitious pressure if it acted stroke would produce the same amount of network as that produce during actual cycle.

Answer: Diesel Cycle

Answer: Dynamometer

Draws fuel from tank to the primary fuel filter, this provides flow throughout the low portion of the fuel system.

Diesel Engine fuel is rated in terms of:

Ideal Cycle of the reciprocating engines

It is an instrument for determining brake power usually by independent measurement of force, time and distance through which the force is moved.

ignition

The difference between the maximum and minimum volume. Answer: Displacement Volume This are used to seal the gasses within the cylinder and to keep oil out

Answer: Piston Rings

Answer: Mechanical Efficiency

Process where heat is added in the Otto Cycle

The ratio of the combined engine efficiency to the brake engine efficiency

Answer: Constant Volume Process where heat is added in the Diesel Cycle Answer: Constant Pressure It is used to reduce the piston bearings and sliding surfaces in machine and does diminish the wear, heat and possibility of seizure of the parts. Answer: Lubricant In a heat engine the ratio of brake power to the indicated power is called Answer: Mechanical Efficiency The efficiency of Otto cycle depends upon the Answer: Compression Ratio The maximum temperature of diesel cycle will occur. Answer: at the end of Isobaric heating The ratio of the average load to the peak load over the designated period of time Answer: Load Factor The ratio of the sum of the individual maximum demands of the system to the overall maximum demands of the whole system Answer: Diversity Factor

Answer: Generator Efficiency The ratio of the average load to that of the peak load of plant is called Answer: Load Factor

The ratio of the peak load to the connected load is called Answer: Capacity Factor The difference between the power plant installed capacity and the peak load is called Answer: Reserved Peak Load A series of processes during when the initial state point and the final state point are the same Answer: Cycle The compressibility factor of an ideal gas is equal to Answer: 1.00 The relation PV=C represents a process or change of state which is known as Answer: Isothermal Process In the relation PVn = C, if the value of n = 0, the process is said to be Answer: Isobaric Compression

The sum of continuous ratings of all equipments and outlets on the customers circuits

In a carnot cycle heat rejection is the ______ process

Answer: Connected Load

Answer: Isothermal Compression

The ratio of the duration of the actual service of the machine or equipment to the total duration of a period of time considered is called

The system in which the mass flow rate out flow are not equal or vary with time and in which the mass within the system changes with time

Answer: Operational Factor

Answer: Unsteady Flow System

The ratio of the brake mean effective pressure to the indicated mean effective pressure

A form of energy that is a sole function of temperature for perfect gasses and strong

function of temperature and weak function of pressure for non perfect gasses, vapors and liquid Answer: Internal Energy It is that portion of the universe an atom a certain quantity of matter or certain volume in space is that one wishes to study

It is a substance existing in the gaseous phase of relatively near its saturation temperature Answer: Vapor The point at which the saturated liquid and saturated vapor states are identical Answer: Critical Point

Answer: System

The point at which heat transfer stops

It is the force of gravity per unit volume of a substance

Answer: Thermal Equilibrium

Answer: Specific Weight

It is an instrument used for determining the specific gravity if a solution Answer: Hydrometer

It is a kind of thermodynamic system whose mass does not cross its boundaries Answer: Closed System Which laws states that acceleration of a particular body is directly proportional to the resultant force acting on it and inversely proportional to its mass? Answer: Newton 2nd Law of Motion

It refers to the temperature at which all molecules motion ceases according to the kinetic theory of heat a. b. c. d.

0K R -273 All of the Above

A substance that receives transport and transfers energy

The area under curve in a pressure volume diagram represents

Answer: Working Substance

Answer: Non Flow Work

The Law of thermodynamics that deals with law of conservation of energy which states that energy can neither be created or destroyed

A boiler steam pressure gage should have a range of at least ______ times the max allowable working pressure

Answer: First Law of Thermodynamics An ideal gas is compressed isothermally the enthalpy change is equal to Answer: Zero It states that in any mechanical mixture of gasses and vapors those that do not combined chemically the total pressure of the gaseous mixture such as moist air is equal to the sum of the partial pressure exerted by the individual gasses or vapors Answer: Daltons Law

Answer: 1.50 It is a valve designed to allow a fluid to pass through in one direction only Answer: Check Valve The ________ is constant in an adiabatic throttling process Answer: Enthalpy It is an ideal cycle for gas turbine plant Answer: Brayton Cycle

It is the most thermal efficient cycle consisting of two isentropic process and two isothermal process Answer: Carnot Cycle How can the average temperature during heat rejection process of a rankine cycle be decreased? Answer: Reduce Turbine Exit Pressure What is commonly done to a vapor power cycle when the turbine has excessive moisture? Answer: Reheating A form of energy that is transferred between two system by virtue of temperature difference Answer: Heat

Answer: less than the amount of heat input The sum of all energies of all the molecules in the system, energy that appears in several complex forms Answer: Internal energy Is a liquid whose temperature below the saturation temperature corresponding to its pressure? Answer: Subcooled liquid A device that violates the thermodynamics is called a

1st

law

of

Answer: perpetual motion machine of the 1stkind The difference of the superheated temperature and saturation temperature at that pressure is known as Answer: Degree of superheat The paraons reaction turbine has

A Themodynamic transfer a. b. c. d.

process

with

no

heat

Isentropic Process Adiabatic Process Throttling Process All of the above

An energy interaction that is not caused by a temperature difference between a system and its surroundings Answer: Work Changing of solid directly to vapor without passing through the liquid state is called

Answer: blades

identical

fixed

and

moving

The maximum efficiency of the de – laval turbine in terms of nozzle angles is Answer: Cos2 L Curtis turbine is a Answer: pressure velocity compounded turbine The compounding of turbine is done in order to Answer: Reduce speed rotor

Answer: Sublimation

The Reheat Factor is the ratio of

A rigid container is heated by the sun, there is no shaft work associated with the container. From the first law of thermodynamics, you determine the resulting work to be

Answer: commulative heat drop to the isentropic heat drop

Answer: Equal to zero The network output of a heat engine is always ______.

The function of a distributor in coil ignition system of internal combustion engine is Answer: to time to spark The knocking tendency in spark ignition engine maybe decreased by

Answer: reducing the compression ratio

An Electrolux refrigerator is called a

The volumetric efficiency of a well designed engine

Answer: three fluids absorption system

Answer: 75% to 90%

For steam

The morsetest is used to find the indicated power of a

Answer: the critical temperature is 374.15°C and critical pressure is 221.2 bar

Answer: Multi cylinder engine

With the increase in pressure

The volume of air compressor is called

delivered

by

the

Answer: Compressor capacity

Answer: the boiling point of water increase and enthalpy of vaporization decreases

The rotary compressors are use for delivering

The specific volume of water when heated from 0°C

Answer: Large quantities of air at low pressure

Answer: First increases

In a centrifugal compressors, an increased in speed at a given pressure ratio causes

The fuel mostly used in boilers is

Answer: Increase in flow and decrease in efficiency Which of the following statement is correct as regard to centrifugal compressor

decreases

and

the

Answer: Non-caking bituminous coal Steam coal is a Answer: Non-caking bituminous coal

Answer: The static pressure of air in the impeller increases in order to provide centripetal force on the air

A process of heating crude oil to a high temperature under a very high pressure to increase the yield of lighter distillates is known as

The volumetric efficiency of compressor

Answer: Cracking

Answer: Decreases compression ratio

with

increase

in

The sub-cooling is a process of cooling the refrigerant in vapor compression refrigeration system Answer: before throttling When food products or other hygroscopic material kept in different compartment are to be maintained at same temperature then the evaporator Answer: none of these The refrigerant commonly used in vapor absorption system is... Answer: Aqua ammonia A vapor absorption system Answer: gives quiet operation

Which of the following statement is incorrect? Answer: the solid fuel efficiency than liquid fuel

have

higher

1kg of carbon monoxide requires 4/3 kg of oxygen and produces Answer: 77/7 kg CO2 1kg of ethylene requires 2kg of carbon oxygen and produces 22/7 kg of carbon dioxide Answer: 9/7 kg of water The mass of carbon per kg of flue gas is given by Answer: 11/3 CO2 + 3/7 CO A safety valve mainly used with locomotive and marine boilers is

Answer: Spring loaded safety valve A device used in boiler to control the flow of steam from the boiler to the main pipe and to shut-off the steam completely when required is known as Answer: Stop valve

A refrigerant temperature is

with

the

highest

critical

Answer: Ammonia Which of the following is an azeotropes refrigerants Answer: R-502

A device used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit

The color of the flame of halide torch incase leakage of Freon refrigerant will change to

Answer: Fusible plug

Answer: Bright green

In a boiler, various heat loss take place the biggest loss is due to

Which of the following refrigerant is highly toxic and flammable?

Answer: Dry flue gasses

Answer: Ammonia

The draft in locomotive boilers is produce by a Answer: Steam jet

In large industrial and commercial reciprocating compression system the refrigerant widely used is

Which of the following statement is wrong?

Answer: Ammonia

Answer: the natural draft reduces the fuel consumption

Environmental protection agencies advise against the used of chlorofluorocarbon refrigerant since

The average value of diagram factor lies between Answer: .65 to .9 The missing quality per stroke is equal to Answer: Cylinder feed-indicated mass of steam The ratio of actual vacuum to the ideal vacuum in a condenser is Answer: Vacuum efficiency The flow of steam is supersonic Answer: in the divergent portion of the nozzle Comparing the mechanical vapor compression refrigeration system with absorption refrigeration the compressor of the former is the case in the latter by Answer: an absorber, a generator, liquid pump and a pressure reduction valve The Freon group of refrigerants are Answer: Halocarbon refrigerants*

Answer: these reacts with ozone layer Most air-cooled condensers are designed to operate w/ a temperature difference of Answer: 14°C The pressure in the capillary tube due to Answer: both A and B a. Fractional resistance offered by the tube wall b. Acceleration of the refrigerant in the tube Capillary tube is not used in large capacity refrigeration system because Answer: Capacity control is not possible

The thermostatic expansion valve operates on the change in the Answer: Degree of superheat at exit from the evaporator Most thermostatic expansion valve are set for superheat of

Answer: 5°C The process of removing the moisture from the food product is called Answer: Dehydration In air blast freezing method Answer: a very low temperature air is circulated w/ a very high velocity In air blast freezing the velocity of air varies from Answer: 30 to 120 m/min

Answer: Eliminate discharge air

spiral

flow

of

The axial flow fans are particularly suitable for handling Answer: Large volume of air at relative low pressures The room air conditioner controls the Answer: Temperature and humidity of air The milky white ice is obtained if Answer: Air is present in it

The difference between the DB temperature and WB

The dry ice is produced by

Answer: WB Depression

Answer: by solidifying liquid CO2

The WB depression is zero when the relative humidity is equal to

The process of heating and immediately cooling the milk for controlling the bacteria growth is known as

Answer: 1.0

Answer: Pasteurization

The minimum temperature to which moist air can be cooled under ideal conditions in a spray washer is

Ice of portable water can crack if frozen at a temperature lower than

Answer: WB Temperature of inlet air

Answer: -12°C

The bypass factor of a cooling decreases with Answer: Decreases in min spacing and increase in no. of rows In order to cool and dehumidify a steam moist air it must passed over a coil at the temp. Answer: which is lower than the dew point temp.of the incoming steam The index which correlates the combined effects of air temperature relative humidity and air velocity on the human body is known as Answer: Effective Temperature

For rectangular duct the aspect ratio is equal to Answer: Ratio of longer and shorter sides The air guide vanes are sometimes installed in axial flow fans in order to

If the compressor runs continually, the cause might be the: a. high-pressure cutout switch is jammed shut b. low pressure switch is jammed shut c. thermal bulb is not operating properly d. scale trap is clogged Answer: B * If the temperature in the icebox is too high, the trouble could be: a. a clogged scale trap b. air in the system c. automatic controls not functioning properly d. insufficient cooling water to the condenser Answer: C * If frost forms on the cylinders, the cause would be: a. expansion valve not open wide enough b. charging valve open too wide c. expansion valve open too wide d. dehydrator not working properly Answer: C * The most likely cause of high superheat would be: a. too much refrigerant b. expansion valve open too wide c. expansion valve closed in too much wide d. back-pressure valve set too high Answer: C * Short-cycling means that the machine: a. grounds out frequently b. stops and starts frequently c. runs too fast d. runs too slow Answer: B *

As a general rule, the cooling water side of the condenser should be schedule for inspection for every: a. month b. 3 months c. 6 months d. year Answer: B *

If the cooling water to the condenser should suddenly fail: a. the solenoid valve will close b. the compressor will shut down c. the expansion valve will close

d. an alarm engineer

will

ring

to

notify

the

c. ultimate d. pour point

Answer: B *

Answer: A *

The phenomenon in which air enters a submerged suction pipe from the water surface is called a: a. whirlpool b. vacuum c. vortex d. thixotropic

The water added to boiler feed to compensate for the water lost through blowdown, leakage, etc a. condensate b. make-up c. sulfur d. economizer

Answer: C *

Answer: B *

The memory lost when the operating power is removed a. power memory b. volatile memory c. initial memory d. quick data

An automatic pressure-relieving device that opens in proportion to the increase in pressure over its opening pressure a. pressure gauge b. relieve valve c. ammeter d. calorimeter

Answer: B * A small fitting with a double offset, or shaped like the letter U with the ends turned out a. elbow tee b. expansion loop c. spigot joint d. cross-over Answer: D * The condition in which droplets of water are carried by steam in the boiler a. priming b. breeching c. carryover d. condensation Answer: A * Analysis of solid fuel to determine moisture, volatile matter, fixed carbon, and ash expressed as percentage of the total weight of the sample a. viscometer b. proximate analysis c. ultimate d. pour point Answer: B *

Answer: B * A rotating device used to convert kinetic energy into mechanical energy a. turbine b. generator c. pump d. vacuum Answer: A * ___________ is obtained by mixing and burning precisely the right amount of fuel and oxygen so that products are left once combustion is complete a. perfect combustion b. burning combustion c. firing combustion d. burning combustion Answer: A * What type of boiler commonly used in industrial and heavy commercial application due to less expensive to make low pressure, easier to maintain and repair? a. water tube boiler b. fire tube boiler c. air tube boiler d. marine water Answer: B *

A gas analysis apparatus in which the percentage of oxygen, carbon dioxide and neonoxide in the gas measured by absorption in separate chemical solutions a. orsat b. proximate

During the emergency operation of the boiler, when there is no water in the gauge glass and steam comes out of the bottom trycock, the water level cannot be determined. What

preventive measure the operator does to save the boiler a. shutdown the boiler and do not add water b. add water to compensate the water losses c. increase the firing rate d. continue to operate the boiler and add water Answer: A * A common test and very important when a boiler is being repaired and or replaced before being back in operation or in service is known as a. hydrostatic test b. water level test c. test clamp d. acid test Answer: A * Why should you avoid bending or twisting of fan blades in an air conditioning unit? a. it will not cause ice build up b. it will wear out the motor bearings and cause noise c. it may not slice suction line d. it decreases the volume flow of refrigerant Answer: B * What is the chemical formula of ozone? O3 a. b. DO2 O2 c. O1 d. Answer: A * It is a form of oxygen photochemicallly produced in nature a. ozone b. oxidizing agent c. oxidation D20 d. Answer: A * In the upper atmosphere, ozone is made by ultraviolet light reacting with a. oxygen b. nitrogen c. hydrogen d. water vapor Answer: A *

The ozone concentration of parts per million(ppm) is generally considered maximum permissible for how many hours of exposure? a. 8 hrs b. 7 hrs c. 4 hrs d. 3hrs Answer: A * In cooling cycle, the dry bulb temp (db) of the air is lowered, what will happens to the relative humidity a. increased b. decreases c. remains constant d. increases or decreases depending on the temperature at which it is cooled Answer: A * What is the effect refrigerant? a. it increases performance b. it decreases performance c. it lowers the refrigerant d. it increases the refrigerant

of

superheating

the

the

coefficient

of

the

coefficient

of

boiling point of the suction pressure of the

Answer: A * A patented device combining expansion and compression function in a single rotor permitting higher cycle temperatures a. comprex b. compressor c. expander d. single-shaft Answer: A * Large-bulb alcohol thermometer used to measure air speed or atmospheric condition by means of cooling. a. Kata thermometer b. JJ Thompson Thermometer c. Kelvin Thermometer d. Wet Bulb Thermometer Answer: A * The ratio of the actual partial pressure exerted by the water vapor in any volume of air to the partial pressure that would be exerted by the water vapor if the water vapor in the air is saturated at the temperature of the air

a. b. c. d.

relative humidity absolute humidity humidity ratio saturation ratio

Answer: A * In sensible heating the absolute humidity remains constant but the relative humidity a. increases b. remains constant c. decreases d. zero Answer: C * The relative humidity becomes 100% and where the water vapor start to condense a. dew point b. saturated point c. cloud point d. critical point Answer: A * A type of refrigerant that will not damage the ozone layer. a. Hydrofluorocarbons (HCF’s) b. R-22 c. Hydrochlorofluorocarbons (HCHF’s) d. R-12 Answer: A * Which of the following is the type of refrigerant that damages Ozone layer? a. Hydrocholorofluorocarbons (HCHF’s) b. R-22 c. R-12 d. All of these Answer: D * All the control stand, pitch of the turbine blades must be adjusted manually by a. a. Sensor b. Float valve c. Gate d. Switch Answer: D * The most commonly used adjustable-blade propeller turbine. a. Francis turbine b. Kaplan turbine c. Impulse turbine d. Pelton wheel Answer: B *

Runner blades are adjusted automatically in synchronism with turbine wicker gates by a/an. a. Control valve b. Governor c. Oil servomotor d. Manual operation Answer: C * What is supplied to the servomotor from the turbine governor oil system through the generator shaft and through a control valve? a. Water b. Air c. Steam d. Oil Answer: D * Used to exhaust air from the casing for starting. a. Ejectors b. Dearator c. Injector d. Blower Answer: A * Advantage for propeller turbines of all types a. open flumes setting b. siphon setting c. cost setting d. capacity setting Answer: B * A large paper plant uses its own cogeneration power plant to generate its electricity because. a. It permits the use of a more efficient generator b. The company can better control the voltage c. It does away with high power lines leading to the plant d. It provides a more efficient conversion of fuel Answer: D * The volumetric output of a centrifugal pump is reduced by closing a valve part way on the intake side of the pump, throttling the intake. The reduction of flow is accompanied by “popping” noises which seem to come from inside the case.What is the probable cause? a. The impeller has broken

b. Dirt particles have got into the pump intake c. The intake valve flow seal is loose and vibrates d. The fluid is cavitating Answer: D * If a man touches two metals which were kept together at room temperature, why would one metal feel colder that the other? a. One has a high temperature coefficient b. One has a lower temperature c. One has a high thermal conductivity d. One has a high temperature Answer: C * The ratio of the internal thermal resistance of a solid to the boundary layer thermal resistance is described by: a. Biot number b. Nusselt number c. Prandtl number d. Reynolds number Answer: A * An instrument which is commonly used to measure the most important characteristics of fuel oil which is viscosity is known as; a. SayboltViscosimeter b. Ph-meter c. Acid Testmeter d. Gravity meter Answer: A * Equipment designed to reduce the amount of water vapor in the ambient atmosphere; a. Blower b. Condenser c. Dehumidifier d. Cooling tower Answer: C * In a refrigerator, this is a chamber for storing low-side liquid refrigerant in a system, which also serves as a surge drum. a. Condenser b. Evaporator c. Compressor d. Accumulator Answer: D * When drying banana chips under the sun, the rate of drying is faster a. On a slightly breezy day b. On a calm day

c. On a cloudy day d. On a hot and windy day Answer: D * An office air conditioning system drew in a quantity of hot air from outside, cooled it to 1 deg C, and mixed it with the internal air of a building. Care was taken to supply enough fresh air to eliminate objectionable odors. The temperature of the space was maintained constant, and yet some people became uncomfortable in the afternoon, why? a. The relative humidity had dropped b. When a person spends a long time at a constant temperature that person becomes uncomfortable c. Radiant heat from others in the office made the space uncomfortable d. The complainers were not really uncomfortable, they were just bored Answer: A * A mechanical device used to burn solid fuel specifically used in coal power plant. a. Stoker b. Boiler c. Staybolt d. Condenser Answer: A * The chemically correct ratio of air fuel a mixture capable of perfect combustion with no unused air or fuel, a. Fuel point b. Pour point c. Stoichiometric ratio d. Stack Answer: C * What is absorbed by sulphites in boiler water treatment? a. Carbon dioxide b. Oxygen c. Carbon monoxide d. Impurities settled in mud drums Answer: D * A hot block is cooled by blowing cool air over its top surface. The heat that is first transferred to the air layer close to the block is by conduction. It is eventually carried away from the surface by: a. Convection b. Radiation c. Conduction d. Thermal

Answer: A *

Answer: C *

In a cooling tower, the water is cooled mainly by; a. Condensation b. Evaporation c. Convection d. Conduction

The compression ratio in an air-standard Otto cycle is 10. At the beginning of the compression stroke the pressure is 120 kpa and the temperature is 15 degree C. Calculate the pressure and the temperature at the end of the compression process. a. 4,000 kPa b. 3,500 kPa c. 3,014 kPa d. 3,200 kPa

Answer: C * A temperature above which a given gas cannot be liquefied; a. Cryogenic Temperature b. Absolute Temperature c. Vaporization d. Critical Temperature Answer: D * What is the color code of steam line in geothermal power plant? a. Green b. Blue c. Silver Gray d. Red Answer: C * Find the thermal efficiency of an air-standard Otto power cycle with a compression ratio of 7. a. 60% b. 50% c. 65% d. 54% Answer: D *

Answer: C * Newton said that a projectile if given enough horizontal velocity will not fail to the earth. Instead, it moves along a path around the earth. The 1st artificial satellite that verified Newton’s statement is a. Apollo 1 b. Houston 1 c. Sputnik 1 d. None of these Answer: C * A rigid contains gas a 100 kpa and 10 degrees C. the gas is heated until the temperature reaches 100 degree C. Calculate the work done by the system. a. 2 b. 0 c. 1 d. 1.5 Answer: B *

A flow volume in which the fluids flow upward through a tapered tube lifting a shaped weight to a position where the upward force just balances to weight. a. Rotameter b. Thermometer c. Viscometer d. Ammeter

At the beginning of the compression stroke in a standard Otto cycle. The pressure is 100 kPa and the temperature is 15 degree C. the compression ratio is 8 and work is 1,017.7 KJ/kg. Determine the mean effective pressure. a. 1,406 kPa b. 1,500 kPa c. 1,350 kPa d. 1,550 kPa

Answer: A *

Answer: A *

An instrument that register total pressure and static pressure in a used to determine velocity. a. Ammeter b. Rotameter c. Pitot tube d. Pour point

The compression ratio in an air standard diesel cycle is 20. At the beginning of the compression process the pressure and the temperature are 0.12 Mpa and 15 degree C respectively. What is the pressure at the end of the compression process? a. 8,500 kPa

b. 7,955 kPa c. 8,300 kPa d. 8,200 kPa Answer: B * Low temperature heat exchanger that is used to absorb heat from the refrigerated space and transfer it to the refrigerant in its tubes so that it can be transported to another and released. a. Condenser b. Evaporator c. Capillary tube d. Compressor Answer: B * The substance employed as cooling effect to absorb heat from the refrigerated space in called a. Condensate b. Feedwater c. Refrigerant d. Moisture Answer: C * A solid of diameter D=0.5 m and surface emissivity of 0.8 contains electrons that dissipate 100 W of heat. If it does not receive radiation from the surroundings, what is the surface temp? a. 300 deg C b. 280 deg C c. 230 deg C d. 270 deg C Answer: C * Where groundwater (wells and springs) or surface water (streams and lakes) are used for feedwater, water hardness of ___ and alkalinity of pH 10 to be ph 11 should be considered a. 0-10 ppm b. 10-20 ppm c. 20-30 ppm d. 30-40 ppm Answer: A * Plunger pumps are only single-acting and are suitable up to approximately a. 2000 psi b. 4000 psi c. 8000 psi d. 10,000 psi Answer: D *

The minimum fluid energy required at the pump inlet for satisfactory operation is known as a. NPSHR b. NPSHA c. Velocity head d. Friction head Answer: A * The actual fluid energy at the inlet a. NPSHR b. NPSHA c. Velocity head d. Friction head Answer: B * Traditional reciprocating pumps with pistons and rods can be either single-acting or double acting and are suitable up to approximately a. 2000 psi b. 4000 psi c. 8000 psi d. 10,000 psi Answer: A * Throttling the input line to a pump and venting or evacuating the receiver tank a. Both increase cavitation b. Both decrease cavitation c. Both eliminate cavitation d. Both drive cavitation Answer: A * The ratio of the actual to the ideal heat transfer coefficient. a. Fouling factor b. Sensible heat ratio c. Cleanliness factor d. Biot number Answer: C * In a typical hydroelectric generating plant using reaction turbines, the turbine is generally housed in a a. Powerhouse b. Penstock c. Forbay d. Setting Answer: A * The ratio of the maximum to minimum mass steam flow rates at which the temperature can be accurately contained by the desuperheater. a. Cleanliness factor

b. Capacity factor c. Turndown ratio d. Fouling factor

After the water passes through the turbine, it is discharges through the draft tube to the receiving reservoir known as the a. Tail race b. Tail water c. Draft tube d. Setting

Answer: C *

Answer: A * Which a. b. c. d.

of the following is equivalent to 1 lb? 5000 grains 6000 grains 7000 grains 8000 grains

Answer: C * The geometrical electricity generating plants that employs a closed-loop heat exchange system in which the heat of the primary fluid is transferred to a secondary fluid, which is thereby vaporized and used to drive a turbine generator set a. Binary cycle plant b. Dual cycle plant c. Double cycle plant d. Cascade cycle

The geothermal solution which contains appreciable amounts of sodium chloride or other salts is called a. Sulfur dioxide b. Potassium silicate c. Sea water d. Brine Answer: D * The quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit at standard conditions. a. Btu b. Calorie c. Joule d. Centigrade Answer: A *

Answer: B *

Answer: C * The spontaneous vaporization of the fluid, resulting in a degradation of pump performance. a. Cavitation b. Vapor lock c. Available head d. Net head Answer: A *

Answer: A *

A structure that removes condensate is called a. Desuperheater b. Cooling tower c. Evaporator d. Condenser

The turbine, draft tube and all related parts comprise what is known as a. Powerhouse b. Forbay c. Setting d. Surge chamber

heat

from

In new equipment, which of the following replace R-11? a. R-12 b. R-123 c. R-502 d. R-22 Answer: B * The very hot steam that doesn’t occur with a liquid a. Pure steam b. Saturated vapor c. Critical steam d. Dry steam Answer: D * The steam produced when the pressure on a geothermal liquid is reduced a. Low pressure steam b. High quality steam c. Sub pressure steam d. Flashed steam Answer: D * The vent or hole in the Earth surface, usually in a volcanic region, from which, gaseous vapors, or hot gasses issue. a. Fumaroles b. Crater

c. Hot spot d. Hot spring Answer: A *

b. 6.1 m/s c. 7.1 m/s d. 4.8 m/s Answer: A *

The earth interior heat made available to man by extracting it from hot water or rocks. a. Geological heat b. Geothermal heat c. Volcanic heat d. None of these

Coolers and chillers for water generally operate with an average temperature difference of a. 3 to 11 C b. 5 to 8 C c. 6 to 22 C d. 10 to 16 C

Answer: B *

Answer: A *

If EER is the energy efficiency ratio, and COP is the coefficient of performance then a. EER = 3.41COP b. COP = 3.41EER c. EER x COP = 3.41 d. 3.41EER x COP = 1

To avoid freezing refrigerant should be a. Below-2 C b. Above-2 C c. Equal to-2 C d. 0 C

Answer: A *

Answer: B *

The spring that shoots jets of hot water and steam into the air is called a. Geyser b. Hot jet c. Thermal jet d. Guyshen

Type of turbine used for low heads, high rotational speeds and larger flow rates a. Axial flow turbines b. Reaction turbines c. Radial flow turbines d. Impulse turbines

Answer: A *

Answer: A *

Which of the following is a reversed Rankine vapor cycle? a. Carnot refrigeration cycle b. Vapor compression cycle c. Air refrigeration cycle d. Absoption cycle

To keep the deflected jet out of the way of the incoming jet, the actual angle is limited to approximately a. 135 deg. b. 150 deg. c. 165 deg. d. 175 deg.

Answer: B * Which cycle? a. b. c. d.

of the following is a reserved Brayton Carnot refrigeration cycle Vapor compression cycle Air refrigeration cycle Absoption cycle

Answer: C * Suction lines should not be sized too large, as reasonable velocity is needed to carry oil from the evaporator back to the compressor. For horizontal suction lines, the recommended minimum velocity is a. 3.8 m/s

problems,

entering

Answer: C * Condensers used for larger refrigerators. a. Air-cooled condensers b. Water-cooled condensers c. High side condensers d. Low side condenser

capacities

Answers: B * Which of the following is an advantage of hydro-plants? a. Hydro plants provide ancillary benefits like irrigation, flood control, aquaculture navigation etc.

b. Modern hydro generators give high efficiency over considerable range of load. This helps in improving the system c. Due to its great ease of taking up and throwing off the load, the hydro power can be used as the ideal spinning reserve in a system mix of the thermal, hydro and power station d. All of the above

should be in the air if the air were saturated at the dry-bulb temperature is: a. Partial pressure actual dew point b. Percentage humidity c. Relative humidity d. Run faster Answer: A *

Answer: B * A form of supercharging in which the exhaust gases drive the supercharger a. Lugging b. Honing c. Turbocharging d. Blower charging

A manometer is an instrument that is used to measure: a. Air pressure b. Condensate water level c. Heat radiation d. Air volume

Answer: C *

Answer: A *

The maximum speed of the turbine under no and no governing action is called a. Runaway speed b. Pre governing speed c. Governing speed d. No load governing

It consists of a wet and dry bulb thermometers mounted on a strip of metal a. Manometer b. Gyrometer c. Pyrometer d. Sling psychrometer

Answer: A *

Answer: D *

Dams constructed primarily to store flood waters called a. Storage dams b. Diversion dams c. Detention dam d. None of the above

Which of the following turbines are centrifugal pumps operating in reverse? a. Reaction turbines b. Impulse turbines c. Tangential turbines d. Axial flow turbines

Answer: C *

Answer: A *

The hole area behind the dam draining into a stream or river across which dam has been constructed is called a. Lake b. Forbay c. Catchment area d. Reserve potential

Measure of hotness or coldness of the body a. Pressure b. Temperature c. Energy d. Entropy

Answer: C *

Weight per unit volume is termed as: a. Specific gravity b. Specific density c. Weight density d. Pressure

Used to described the act of blowing the exhaust product out with the air-fuel mixture a. Supercharging b. Scavenging c. Honing d. Choking Answer: B * The relationship of water vapor in the air at the dew point temperature to the amount that

Answer: B *

Answer: C * The temperature at which the water vapor in the air begins to condensed, or the temperature at which the relative humidity of air becomes 100%. a. Flash point b. Boiling point

c. Dew point d. Freezing point Answer: C *

a. b. c. d.

90 deg. 135 deg. 165 % 175 deg.

Answer: C *

The useful energy transfer in Btu/hr divided by input power in watts. This is just the coefficient of performance expressed in mixed units. a. Energy efficient ratio b. Coil efficient c. Bypass factor d. Sensible heat ratio

The regulation of the water in the form of a relatively small pond of reservoir provided at the plant is called a. Pondage b. Water storage c. Reservoir d. Lake

Answer: A *

Answer: A *

What is the proper seat width of a spray valve? a. 1/16 in. b. 1/32 in. c. 1/8 in. d. 1/4 in.

The bypass factor for large commercial units a. Around 20% b. Around 30% c. Around 10% d. Around 50%

Answer: A * Which of the following is the refrigerant “of choice” in uniting air conditioners? a. R-22 b. R-123 c. R-11 d. R-502 Answer: A * When a forbay is not part of the generating plant’s design, it will be desirable to provide a ________ in order to relieve the effects of rapid changes in flowrate. a. Forbay b. Draft tube c. Surge chamber d. Penstock

Answer: C * A vertical turbine pump with the jump and motor closed coupled and design to be installed underground, as in the case of a deepwell pump. a. Horizontal split case pump b. Booster pump c. Submersible pump d. Vertical shaft turbines pump Answer: C * An underground formation that contains sufficient saturated permeable material to yield significant quantities of water. a. Aquifer b. Ground water c. Wet pit d. Well water

Answer: C *

Answer: A *

The water formed by condensation of steam is called a. Distilled water b. Condensate c. Dew d. Condenser

A timber, concrete or masonry enclosure having a screened inlet kept partially filled with water by an open body of water such as pond, lake, or steams. a. Aquifer b. Ground water c. Wet pit d. Well water

Answer: B * To keep the deflected jet out of the way of the incoming jet, the actual angle is limited to approximately

Answer: C *

Water which is available from well, driven into water bearing subsurface strata (aquifer) a. Aquifer b. Ground water c. Wet pit d. Well water Answer: B * Imparts velocity to the liquid, resulting from centrifugal force as the impeller is rotated. a. Impeller b. Stuffing box c. Casing d. Shaft sleeve Answer: A * A means of throttling the leakage which would otherwise occur at the point of entry of the shaft into the casing. a. Impeller b. Stuffing box c. Casing d. Shaft sleeve Answer: B * Protect the shaft where it passes through the stuffing box. a. Impeller b. Stuffing box c. Casing d. Shaft sleeve Answer: D *

b. Headrace c. Penstock d. Tunnel Answer: D * The small reservoir in which the water level rises or falls to reduce the pressure swings so that they are not transmitted to the closed conduit is called a. Penstock b. Power reservoir c. Pressure tank d. Tunnel Answer: D * A structure used to relieve the reservoir of excess water a. Spillway b. Diversion channel c. Butress dam d. Arch dam Answer: A * An ordinary thermometer whose bulb enclosed in a wetted cloth sac or wick a. Dry bulb thermometer b. Wet bulb thermometer c. Ordinary thermometer d. Mercury thermometer

is

Answer: B *

The ratio of the actual vapor density to the vapor density at the saturation a. Relative humidity b. Absolute humidity c. Humidity ratio d. Saturation ratio

Device that takes advantage of the relatively constant temperature of the Earth’s interior, using it as a source and sink of heat for both heating and cooling. a. Geothermal devices b. Geothermal generator c. Geothermal heat pumps d. Geothermal turbines

Answer: A *

Answer: C *

An expression of the mass of water vapor per unit mass of dry air a. Relative humidity b. Absolute humidity c. Humidity ratio d. Saturation ratio

If the heat is being removed from water, the device is known as a. Chiller b. Cooler c. Air conditioner d. Air cooler

Answer: C *

Answer: A *

A closed channel excavated through an obstruction such as a ridge of higher land between the dam and the powerhouse is called a. Canal

The process that uses a stream of geothermal of hot water or stream to perform successive task requiring temp is called a. Diminishing heat b. Decreasing heat

c. Cascading heat d. Negative gradient process Answer: C * The locus of states that the same value of stagnation enthalpy and mass flux is called. a. Fanno line b. Reyleigh line c. Willian’s line d. Mollier’s line Answer: A * Combining the conservation of mass and momentum equations into a single equation and plotting it on the h-s diagram yield a curve called a. Fanno line b. Reyleigh line c. Willian’s line d. Mollier’s line Answer: B * Fluids that are pumped in processing work are frequently more viscous than water. Which of the following statement is correct? a. Reynolds number varies directly as the viscosity b. Efficiency of a pump increases as the viscosity increases c. Increased fluid friction between the pump parts and the passing fluid increases useful work d. Working head increases as the viscosity Answer: C * The law that states “Entropy of all perfect crystalline solids is zero at absolute zero temperature” a. Zeroth law of thermodynamic b. First law of thermodynamics c. Second law of thermodynamics d. Third law of thermodynamics Answer: D * When two bodies, isolated from other environment, are in thermal equilibrium with a third body, the two are in thermal equilibrium with each other. a. Zeroth law of thermodynamic b. First law of thermodynamics c. Second law of thermodynamics d. Third law of thermodynamics Answer: A *

The sum of the energies of all the molecules in a system where energies appear in several complex forms is the a. Kinetic energy b. Internal energy c. Potential energy d. Friction energy Answer: B * The Carnot refrigeration cycle includes all of the following process except a. Isentropic expansion b. Isenthalpic expansion c. Isothermal expansion d. Isentropic compression Answer: B * The following factors are necessary to define a thermodynamic cycle expect a. The working substance b. High and low temperature reservoirs c. The time it takes to complete the cycle d. The means of doing work on the system Answer: C * A dry cooling tower where steam is condensed by cold water jets (surface or jet condenser) a. Direct condensing tower b. Indirect condensing dry cooling tower c. Evaporative cooling tower d. Atmospheric cooling tower Answer: B * The measure of the ability of a goal to withstand exposure to the environment elements without excessive crumbling a. crumbling coefficient b. weatherability c. cohesiveness d. attrition coefficient Answer: B * A type of coal that produced a fused coal mass as it burns. a. plastic coal b. caking coal c. soft coal d. high-moisture coal Answer: B * A combustible coal content that produces a major atmospheric pollutant consequently, it

is important that coal has a low percentage of this component. a. nitrogen b. sulfur c. carbon d. hydrogen

temperature at the same point, converted to liquid. a. NPSH b. specific head c. pump operating head d. suction head

Answer: B *

Answer: A *

Which of the following statement is/are true regards to the first law of thermodynamics for a change in state of a control mass? a. since heat and work are path function Q-W must also be a path function b. Q-W is an inexact differential c. A and B d. Q-W is a point function Answer: D * Which of the following statements is/are true with regards to heat and work? a. heat and work are both transient phenomena b. both heat and work are boundary phenomena c. both heat and work are path function d. all of the above

The algebraic difference of the discharge and suction heads. a. pump operating head b. TDH c. A and B d. NPSH Answer: C * The transfer of the heat energy from exhaust gases to compressed air flowing between the compressor and combustion chamber. a. intercooling b. convection c. regeneration d. economics

Answer: D *

Answer: C *

The height of the surface of the water above the gage point a. pressure head b. velocity head c. dynamic head d. static head

The removal of heat from compressed air between stages of compression. a. regeneration b. exhaustion c. heat evacuation d. intercooling

Answer: D *

Answer: D *

The head required to produce a flow of the water. a. static head b. pressure head c. velocity head d. dynamic head

Which a. b. c. d.

Answer: C * The sum of the pressure head and velocity head. a. static head b. pressure head c. velocity head d. dynamic head Answer: D * The dynamic pressure of the liquid at pump section less the corresponding to the

of the following is not a solid fuel? peat briquettes tar coke

Answer: C * Which of the following is basically a jet engine that exhausts into a turbine generator? a. aeroderivative gas turbine b. brayton engine c. industrial gas turbine d. joule turbine Answer: A * It is referred to as the maximum continuous power available from a hydroelectric power plant even under the most adverse hydraulic condition

a. b. c. d.

primary power continuous base power continuous peak power firm power

Answer: D *

How may moisture be removed from air? a. condensation b. adsorption c. A and B d. none of these Answer: C *

Working fluids used in refrigeration cycle decreases in temperature as they pass through the throttle valve. The JouleThompson coefficient of these fluids is a. negative b. zero c. positive d. none of the above

The ratio of the highest main compressor discharge pressure as the lower main compressor inlet pressure a. cycle pressure ratio b. cycle pressure level c. work ratio d. air ratio

Answer: C *

Answer: A *

Exergy is always a. being produced b. being destroyed c. not changing d. none of the above

The ratio of the maximum pressure in the cycle to the atmospheric pressure a. cycle pressure ratio b. cycle pressure level c. regenerator effectiveness d. thermal efficiency

Answer: B * In heat transfer by conduction, due to symmetry the heat flow as a point is perpendicular to the isothermal surface through the point. This mode of conduction is a characteristic of a. non-isotropic b. isotropic c. insulators d. conductors Answer: B * The heat transferred radially across insulated pipe per unit area a. remain constant b. inversely proportional to the thermal conductivity c. decrease from pipe wall to insulated surface d. increase form pipe wall to insulated surface Answer: C * A change of phase directly from vapor to solid without passing through the liquid state is called as a. sublimation b. vaporization c. solidification d. deposition Answer: D *

Answer: B * The phenomenon that warm air rise and cold air settle is called a. Stratification b. Setting Due c. Sedimentation d. Ventilation Answer: A * A cooled heat exchanger that transfer heat from compressed air to cooler air. a. Intercooler b. Refrigerator c. Economizer d. Aftercooler Answer: D * The measure of a fluids resistance to flow(the internal friction of a fluid) as temperature increase. a. Density b. Viscosity c. Specific gravity d. Temperature Answer: B * When a solid material is said to be “dry” it means that a. The solid does not contain any moisture

b. The solid still contains very small amount of moisture c. The solid contains equilibrium moisture d. The weight of the solid is the same as the bone dry weight

b. Triple shaft c. Single shaft d. Quadruple shaft Answer: C *

Answer: B *

Reflector of a nuclear reactor are made up of a. Boron b. Cast iron c. Beryllium d. Steel Answer: C * The function of a moderator in a nuclear reactor is a. To slow down the fast moving electrons b. To speed up the slow moving electrons c. To start the chain reaction d. To transfer the heat produced inside the reactor to a heat exchanger Answer: A * Which of the following is the most commonly used moderator? a. Graphite b. Sodium c. Deuterium d. Heavy water Answer: A * Ammonia leaks in the condenser can be detected by: a. Smelling the discharge water b. Applying litmus paper to the circulating water discharge c. Adding oil of peppermint to the system and tracing the small d. Applying a soapy mixture to the condenser heads and looking for bubbles Answer: B * Control rods for nuclear reactors are made of a. Graphite b. Concrete c. Cadmium d. Lead Answer: C * Heavy duty gas turbines typically have a. Double shaft

Which of the following statements is not a key feature of fourier’s heat conduction. a. It is phenomenological b. It defines an important material property called thermal conductance c. It is vector expression indicating that the heat flux is normal and the direction of decreasing temperature. d. Assume that the thermal conductivity is constant with respect to temperature of the material Answer: D * A heat engine whose thermodynamic efficiency is greater than that of a Carnot device using the same energy reservoir is known as: a. A perpetual machine of the zeroth kind b. A perpetual machine of the second kind c. A perpetual machine of the first kind d. A perpetual machine of the third kind Answer: B * The degrees of power interval in 4-stroke cycle of a six-cylinder engine is a. 60 degrees b. 180 degrees c. 90 degrees d. 120 degrees Answer: D * The portion of sunlight, rich in ultraviolet rays, which has a strong effect on photographic plate. a. Gamma rays b. X-rays c. Beta rays d. Actinic rays Answer: D * Which of the following does not illustrate the effect of temperature or pressure on gas solubility? a. Air bubbles from on the sides of a warm glass of water b. Soda pop is bottle under pressure

c. Boiling frees water gases d. Air is more humid on rainy days

d. shape and size of coal Answer: C *

Answer: D *

Which of the following is the major consideration while selecting the nuclear power plant? a. Safety b. Load center c. Disposal of waste d. Availability of water

A boiler horsepower is equal to the evaporation of 3405lbs of 100 degrees c water per hr. how much steam in lb per hour a 700 horsepower boiler can generate? a. 24150 lb / hr b. 21000 lb/ hr c. 18000 lb/hr d. 30000 lb/hr Answer: B *

A moderator is used to: a. Slow down neutrons b. Slow down electrons c. Accelerate neutrons d. Direct flow of electron

If a pressurized water reactor (PWR) a. the coolant water is pressurized to work as moderator b. the coolant water boils in the core of the reactor c. the coolant water is pressurized to prevent boiling of water in the core d. no moderator is used

Answer: A *

Answer: C *

Which of the following material is not used as moderator? a. Graphite b. Beryllium c. Aluminum d. Light water

A turbine setting where one disadvantage is the difficulty of lubricating the operating mechanism, with consequent relatively rapid water a. siphon setting b. open fume setting c. cast setting d. capacity setting

Answer: C *

Answer: C * In nuclear power plant which of the following is used to slow down the fast neutron? a. Reflector b. Shield c. Control rod d. Moderator Answer: D * The amount of chemical energy in a given mass or volume of fuel. a. Heating value b. Energy storage c. Calorific value d. A and C Answer: D * Which of the following property of coal has major influence on the design and operation of a steam power plant? a. density of coal b. carbon content of coal c. ash content of coal

Answer: B * It is inversely proportional to the power required to grind the coal to certain fitness a. Pulverizing index b. Fireness index c. Grindability index d. Inverse power coefficient Answer: C * The accounting of all energy units involved in a system a cycle of a piece of equipment a. Thermodynamic solution b. Equilibrium condition c. Summation of energy units d. Heat Balance Answer: D * Air arrangement of headwater tubes located in the boiler a. Economizer b. Condenser

c. Evaporator d. Boiler Answer: A * At the start of the compression process of an air-standard diesel power cycle the pressure is 100kpa and the temp is 15 deg C. for a mean effective pressure of 1362 kpa and compression ratio of 18 the heat of combustion developed is 1800 kj/kg. What is the thermal efficiency of the cycle? a. 65 % b. 59 % c. 55% d. 68% Answer: B * Which of the following cycle is bulky and involves toxic fluids hence it is unsuitable for home and autocooling a. Carnot refrigeration cycle b. Absorption cycle c. Vapor and compression cycle d. Air refrigeration cycle Answer: B * For efficient operation, the condensing temperature should not be lower than a. 5 C b. 17 C c. 10 C d. 20 C Answer: A * For efficient operation, the condensing temperature should not be more than a. 5 C b. 17 C c. 10 C d. 20 C Answer: B * Condensers used in small and medium sized up to approximately 100 tons refrigerators. a. Air-cooled condensers b. Water cooled condensers c. High side condensers d. Low side condensers Answer: A * The peak power that can be produced on an occasional basis a. Brakepower b. Intermittent rating

c. Continuous duty rating d. Power rating Answer: B * A value of a property that includes the effect of friction is known as: a. Brake value b. Indicated value c. Friction value d. Actual value Answer: A * Undergrounds system of hot water and / or steam a. Hydrothermal resource b. Geothermal resource c. Hot water resource d. High pressure water system Answer: A * The capacity of a substance to transmit a fluid is called a. Fluidity b. Permeability c. Porosity d. Smoothness Answer: B * The ratio of the aggregate volume pore spaces in rock or soil to its total volume is called a. Porosity b. Sphericity c. Permeability d. Salinity Answer: A * A dry-cooling tower where steam travels through large diameter “trunks” to a crossflow heat exchanger where it is condensed and cooled by the cooler air a. Direct condensing tower b. Indirect condensing dry cooling tower c. Evaporative cooling tower d. Atmospheric cooling tower Answer: A * The electron magnetic radiation emitted from the daughter nucleus when an alpha particles leaves the patent atom a. Neutron b. Position c. Gamma ray d. K-capture

Answer: C *

d. 3 kg

The electricity generating units that are operated to meet the constant or minimum load on the system is called a. Constant load plants b. Baseload plants c. Invariable load plants d. Steady load plants

Answer: C * Determine the quantity of latent heat transferred to an evaporator when 5 kg of water undergoes those changes from a liquid at 0˚C to ice at 0˚C. a. 1,300 kJ b. 1,675 kJ c. 1,450 kJ d. 1,800 kJ

Answer: B *

Answer: B *

The effectiveness of a body as a thermal radiator at a given temperature, a. Absorptivity b. Conductivity c. Emissivity d. Reflectivity

Which of the following types of air dryers works by absorbing moisture on a solid desiccant or drying material such as activated alumina, silicon gel or molecular sieve? a. Regenerative dryer b. Spray dryer c. Deliquescent dryer d. Refrigerated dryer

Answer: C * The size of a steam reciprocating pumps is generally designed by a three-digit number size as 646. The first digit designates a. Stroke of the pump in inches b. Inside diameter of the steam cylinder measured in inches c. Percent clearance d. Number of cylinder

Answer: C *

Answer: B *

Answer: B *

A device which automatically governs or controls the speed of an engine. a. Servomotor b. Indicator c. Governors d. Speedometer

A reactor that utilizes slow moving neutrons a. Slow reactor b. Intermediate reactor c. Thermal reactor d. Slow speed reactor

Answer: C * The most common type of refrigeration cycle, finding application in household refrigerators, air conditioners for cars and houses, chillers and so on. a. Carnot refrigeration cycle b. Vapor compression cycle c. Air refrigeration cycle d. Absorption cycle Answer: B * A 100kg is at 0˚C is heated by supplying 2000KJ of heat to it. If the heat of fusion is 335kJ/kg how many kilograms of ice will melt into water? a. 8 kg b. 10 kg c. 6 kg

A reactor that employs fast or high energy neutrons and contains no moderator is called a. High energy reactor b. Fast reactor c. High speed reactor d. Turbo reactor

Answer: C * With a reversible regenerator, the thermal efficiency of the Ericsson cycle is ______ to that of the Carnot cycle a. Less than b. Greater than c. Proportional d. Equal Answer: D * The ratio of total dissolved solids in the recirculating water to the total dissolved solids in the make-up water. a. Ratio of concentration b. Cooling efficiency c. Coil efficiency d. Bypass factor Answer: A *

Cooling efficiency is typically a. 75 to 80% b. 50 to 70% c. 80 to 85% d. 90 to 95% Answer: B * Forced draft towers can cool the water to within a. 10 to 12 F b. 5 to 6 F c. 20 to 24 F d. 2.5 to 3 F Answer: B *

The device that transfer thermal energy from one fluid to another a. Condenser b. Feedwater c. Evaporator d. Heat exchanger Answer: D * The process of returning spent geothermal fluids to the subsurface is called a. Injection b. Returning c. Rejection d. Exhaustion Answer: A *

The fluid pressure difference created by column of heated gas, as by chimney is called a. Natural draft b. Forced draft c. Induced draft d. Required draft

The simultaneous demand of all customers required at any specified point in an electric power system is called a. Demand b. Electrical demand c. Power demand d. Load

Answer: A *

Answer: D *

An evaporator in a refrigeration unit makes use of which heat transfer modes? a. Conduction b. Convection c. Radiation d. All of the above

The water bearing stratum of permeable sand, rock, or gravel is called a. Reservoir b. Water source c. Aquifer d. Well

Answer: D *

Answer: C *

Chimneys that rely on natural draft are sometimes referred to as a. Natural chimney b. Normal chimney c. Gravity chimney d. Stack

The power required to deliver a given quantity of fluid against a given head with no losses in the pump is called a. Wheel power b. Brake power c. Hydraulic power d. Indicated power

Answer: C *

Answer: C *

It is a device used for atomizing or cracking fuel oil and through which the fuel oil is injected into the working cylinders of Diesel engines a. Atomizer b. Injector c. Fuel spray nozzle d. Cracker

As the liquid changes phase to vapor, its enthalpy a. Increases b. Decreases c. Remains constant d. Enthalpy has no relation to phase change

Answer: A *

Answer: A *

Sometimes called percentage humidity a. Relative humidity b. Absolute humidity c. Humidity ratio d. Saturation ratio

An air pollutant which is the result of burning fuels oils a. ferrous oxide b. hydrogen nitride c. sulfur dioxide d. aluminum oxide

Answer: D *

Answer: C *

Sometimes called specific humidity a. Relative humidity b. Absolute humidity c. Humidity ratio d. Saturation ratio

Gas flow caused by boiler’s pressure being less than boiler’s furnace pressure a. induced draft b. infrared c. injector d. inhibitor

Answer: C * The sensible heat of the air is a function of the a. Wet bulb temperature b. Dry bulb temperature c. Dewpoint temperature d. Saturation temperature Answer: B * The latent heat of the air is a function of the a. Wet bulb temperature b. Dry bulb temperature c. Dewpoint temperature d. Saturation temperature

An index of the total heat (enthalpy) of the air a. Wet bulb temperature b. Saturation temperature c. Dry bulb temperature d. Dewpoint temperature Answer: A * Also known as Francis turbines or radial flow turbines a. Impulse turbines b. Tangential turbines c. Reaction turbines d. Axial flow turbines Answer: C *

Answer: A *

process

The relative humidity becomes 100% and where the water vapor start to condense a. dew point b. saturated point c. cloud point d. critical point Answer: A *

Answer: C *

Cooling and dehumidifying commonly used for: a. Summer air conditioning b. Ice making c. Winter cooling d. Heat pumping

Answer: A *

is

Calculate the use factor of a 135 MW plant with a load factor of 0.8 and a peak load of 120 MW if its operation is limited to 8500 hrs in a year a. 0.90 b. 0.73 c. 0.70 d. 0.78 Answer: B * Calculate the reserve factor for a power plant with a load factor of 0.7 average load of 50 MW and rated capacity of 80 MW a. 2 b. 1.5 c. 1.12 d. 1.6 Answer: C * If the discharge side of the thermal expansion valve is warmer than the a. expansion valve is working normally b. expansion valve is not working normally c. solenoid valve is not working normally d. scale trap is dirty Answer: B *

The interactions that occurs between a system and its surroundings as a system executes a process, which is the result of the system being at temperature different from the surrounding is a. mass transfer b. heat transfer c. work transfer d. none of the above Answer: B * Exergy destruction is a result of a. heat transfer b. work production c. process irreversibility d. none of the above Answer: C * Air can be prevented from getting into the system by: a. keeping all gland and stuffing boxes on the high pressure side tight b. keeping the dehydrator clean at all times c. keeping all glands and stuffing boxes on the low pressure side tight d. running the refrigerant through an aerator Answer: C * An excessively high head pressure could be caused by a. solenoid valve shut off b. insufficient cooling water to the condenser c. insufficient cooling water to the evaporator coils d. too much cooling water to the condenser Answer: B * The solenoid valve is controlled by a. the amount of liquid in the system b. the amount of gas in the system c. the temperature in the condenser d. the thermal switch operated by the icebox temperature Answer: D * If the head pressure is too high a. the relief valve should open before the high pressure output b. the relief valve should open and let excess refrigerant go to receiver c. the high pressure cutout switch should operate before the relief valve opens

d. close in on the suction valve Answer: C * Under normal operating conditions, when a solid material to be dried is placed inside a batch tray dryer, the material is usually subjected a. under constant drying conditions b. under variable drying conditions c. under high temperature drying d. under low temperature drying Answer: A * In terms of heat transfer, the use of a cooling tower is said to be more efficient and more economical compared to an ordinary heat exchanger since a. large volume of air is available and free b. temperature profiles of air and water can cross each other c. large amount of water can be processed d. a cooling tower is much smaller and cheaper than a heat exchanger Answer: B * In cooling cycle, the dry bulb temp (db) of the air is lowered, what will happens to the relative humidity a. increased b. decreases c. remains constant d. increases or decreases depending on the temperature at which it is cooled Answer: A * A rough measure of the physical size of the equipment which must handle the specified quantity of the fluid a. pressure ratio b. fuel rate c. thermal efficiency d. air rate Answer: D * In sensible heating the absolute humidity remains constant but the relative humidity a. increases b. remains constant c. decreases d. zero Answer: C * Scale in boiler can.

a. b. c. d.

Create low steam quality Cause foaming Over blow-off line Inhibit circulation and heat transfer

Answer: D * What part of heat exchangers that are classified as radiant convection and placed at the near of the furnace, where they receive the bulk of the radiation from the flame. a. Radiant superheaters b. Condenser c. Radiator d. Evaporators

c. Extracted steam d. A and C Answer: D * Vapor pumps that raise the pressure of the refrigeration to a level that permits sufficient heat rejection to the condensing medium. a. Fans b. Blower c. Compressor d. Suction Answer: C *

The reactor in which fissionable fuel produced is more than the fuel consumed is known as a. Fast reactor b. Breeder reactor c. Thermal reactor d. None of the above

Low temperature heat exchanger that is used to absorb heat from the refrigerated space and transfer it to the refrigerant in its tubes so that it can be transported to another and released. a. Condenser b. Evaporator c. Capillary tube d. Compressor

Answer: B *

Answer: B *

Among the effluents that may be released from the hydrothermal reservoir which one is the most toxic? a. Carbon dioxide b. Hydrogen sulfide c. Methane d. Ammonia

The process of cooling without changing the humidity ratio is known as: a. Sensible heating b. Cooling and dehumidifying c. Sensible cooling d. Heating and humidifying

Answer: A *

Answer: B * A refrigerant control valve that maintains a constant pressure in an evaporator a. Bleed valve b. Angle valve c. Automatic expansion valve d. Ball check valve Answer: C * Any arrangement whereby steam is bled from a turbine for a purpose of thermal regeneration of the condensate to a temperature level approaching that of the boiler water. a. Regenerative b. Extraction cycle c. Bled-off steam cycle d. Regenerative extraction cycle Answer: A * The steam extraction from the turbine a. Bled steam b. Extraction

Answer: C * The pressure rise from greater to a lesser vacuum, created in a gas loop between stream generator outlet and chimney by means of a fan is called a. Forced draft b. Induced draft c. Required draft d. Balanced draft Answer: B * In a sensible heating process humidity ratio is: a. Increased b. Decreased c. The same d. Cannot be determined

the

final

Answer: C * The process of simultaneous heating and dehumidifying is known as: a. Sensible heating b. Cooling and dehumidifying c. Sensible cooling

d. Chemical dehumidifying Answer: D * The process in increasing the dry-bulb temperature without changing the humidity ratio is known as: a. Sensible heating b. Cooling and dehumidifying c. Sensible cooling d. Heating and dehumidifying

The higher the wet bulb temperatures a. The higher the efficiency b. The lower the efficiency c. The efficiency is limited d. The efficiency is maximum

Answer: A *

Define the relative difficulty in cooling, essentially the relative amount of contact area or fill volume required a. Heat load b. Tower load c. Cooling duty d. Rating factor

The process of simultaneous cooling and decreasing of humidity ratio is known as: a. Sensible cooling b. Cooling and humidifying c. Cooling and dehumidifying d. Heating and dehumidifying Answer: C *

Answer: B *

Answer: D *

The process of simultaneous heating and humidifying ratio is known as: a. Sensible cooling b. Cooling and humidifying c. Heating and humidifying d. Heating and dehumidifying

The measure of the amount of thermal energy transfer occurring within the evaporator per unit mass under stated conditions. a. Refrigeration capacity b. Heat capacity c. Refrigeration effect d. Heat absorptivity

Answer: C *

Answer: C *

Which of the following refrigeration cycle is practical when large quantities of waste or inexpensive heat energy are available? a. Heat – Driven Refrigerating Cycle b. Absorption Cycle c. Vapor Compression Cycle d. Air Refrigeration Cycle

Forced draft fans are run at relatively high speeds in the range of a. 1200 to 1800 rpm b. 1500 to 2000 rpm c. 1000 to 1600 rpm d. 900 to 1500 rpm

Answer: A* The vaporization process that occurs at temperature below the triple point of a substance is called. a. Evaporation b. Boiling c. Sublimation d. Condensation Answer: C * As the pressure increases, the amount of work it can do increases and its enthalpy a. Increases b. Remained the same c. Decreases d. Pressure and enthalpy has no relation at all Answer: A *

Answer: A* For realistic problems, the achievable stack effect probably should be considered to be a. 75% of the ideal b. Equal to the ideal c. 80 % of the ideal d. Half the ideal Answer: C * In a balanced system, the available draft is a. Unity b. 100 c. Zero d. Infinite Answer: C *

Evaporation loss can be calculated from the humidity ratio increase and is approximately _________ decrease in water temperature a. 0.18% per C b. 0.25% per C c. 0.10% per C d. 0.30% per C Answer: A * Water lost in small droplet and carried away by the air flow a. Range b. Approach c. Drift d. Bleed-off Answer: C * Which of the following statement is a scheme for energy storage? a. Pumped hydro b. Magnetic energy storage c. Thermal energy storage d. All of the above Answer: D * What are the main components in a combined cycle power plant? a. Diesel engine and air compressor b. Steam boiler and turbine c. Gas engine and waste heat boiler d. Nuclear reactor and steam boiler Answer: C * Across the shock, the stagnation temperature of an ideal gas a. Increases b. Decreases c. Remains constant d. Proportional Answer: C * The maximum possible work that can be obtained a cycle operating between two reservoirs is found from a. Process irreversibility b. Carnot efficiency c. Availability d. Reversible work

a. Proportional to the mass of the suction vapor that the compressor takes in at the suction inlet per unit time b. Equal to the mass of the suction vapor that the compressor takes in at the suction inlet per unit time c. Less than the mass of the suction vapor that the compressor takes in at the suction inlet per unit time d. Greater that the mass of the suction vapor that the compressor takes in at the suction inlet per unit time Answer: B * A boiler operated at pressure not exceeding 1.055kg/cm2 gage steam, or water temperature no exceeding 121˚C. a. Low pressure heating boiler b. Hot water supply boiler c. Miniature d. Power boiler Answer: A * All of the following statements about wet bulb temperature are true, EXCEPT a. Wet bulb temperature is equals adiabatic saturation temperature b. Wet bulb temperature is the only temperature necessary to determine grains water per lb of dry air c. Wet bulb temperature lies numerically between dew point and dry bulb temperature for unsaturated systems d. Wet bulb temperature equals both drybulb and dew point temperature at 100% relative humidity Answer: C * Which of the following statements is false when gasoline is used as diesel fuel. a. Gasoline does not ignite b. Gasoline wears the fuel-injection pumps because of its low viscosity c. Addition of lubrication oil to gasoline will just severe the situation d. All of the above Answer: C *

Answer: B *

The mass flow compressor is

rate

produces

by

the

Heat added to or removed from a substance that cause a change of temperature: a. Absolute heat b. Latent heat c. Specific heat

d. Sensible heat

c. Critical temperature d. Saturation temperature

Answer: D * It refers to any arrangement whereby steam is bled from a turbine more pressure for any purpose whatsoever a. Regeneration b. Extraction c. Bled-off cycle d. Regenerative extraction cycle Answer: B * For any given barometric pressure, humidity ratio is a function of the a. Critical temperature b. Dew point temperature c. Dry bulb temperature d. Wet bulb temperature

the

Answer: B * The humidity ratio corresponding to any given dew point temperature varies with the total barometric pressure, increasing as the barometric pressure a. Increases b. Decreases c. Varies d. Constant Answer: B * In an adiabatic saturation process the final relative humidity is: a. Increased b. Decreased c. The same d. Cannot be determined Answer: A * An adiabatic saturation process is also known as: a. Constant WB temperature process b. Constant DB temperature process c. Constant DP temperature process d. Constant vapor temperature process Answer: A *

When measuring the ____________ of air, the bulb of the thermometer should be shaded to reduce the effect of direct radiation a. Dry bulb temperature b. Wet bulb temperature

Answer: A * To obtain an accurate reading with a wet bulb thermometer, the wick should be saturated with a. Clean air b. Vapor c. Moist d. Clean water Answer: D * The amount by which the wet bulb temperature is reduced below the dry bulb temperature depends on relative humidity of the air and is called a. Range b. Approach c. Drift d. Wet bulb depression Answer: D * The ratio of the mass of water vapor per unit mass of dry air to the mass of water vapor required for saturation of the same air sample a. Relative humidity b. Absolute humidity c. Humidity ratio d. Saturation ratio Answer: D * Canisters of helmets shall be removed immediately after having been used or the seal broken and is unused, must be renewed at least once every: a. 1 year b. 2 years c. 3 years d. 4 years Answer: B * Maximum demand of 30 MW and 10 MW are connected to a power plant with a peak load of 70 MW. What is the diversity factor of the plant? a. 0.50 b. 0.70 c. 0.65 d. 0.86 Answer: D * Calculate the net radiation heat flux exchange of two bodies with surface temperature of 25 degree0C. The radiation heat transfer coefficient is 7.0 W/m2-k

a. b. c. d.

700 750 665 650

w/sq w/sq w/sq w/sq

m m m m

Answer: C *

c. Remain the same d. Internal energy has no relation to the compression process Answer: A *

The point of particular pressure where the steam is extracted a. Bleeder point b. Extraction point c. Bleeder d. A and B

The electricity generating plants that are operated to meet the peak or maximum load on the system are called a. Peaking plants b. High-load plants c. High demanding plants d. Add-on plants

Answer: D *

Answer: A *

A gas in piston - cylinder setup undergoes an expansion at such a rate that PV 1.2 =constant. Before the expansion process the pressure of the gas is 300 kPa and the volume is 0.50 m 3. If the final volume of the gas is 0.1 m3, calculate the work done by the gas a. 9.71 KJ b. 11.0 KJ c. 12 KJ d. 8 KJ

Compute the rate of water transfer by melting an ice at a rate of 50 kg/hr. a. 8 kJ/sec b. 10 kJ/sec c. 5 kJ/sec d. 12 kJ/sec

Answer: A * Which of the following regions in a multi-stage turbine where efficiency a highest? a. High pressure region above 200 psi b. Intermediate pressure region c. Low pressure most region d. A and B Answer: B * The temperature where the ash becomes very plastic, somewhat below the melting point of the ash. a. Ash - softening temperature b. Ash - plasticity temperature c. Ash – fluidity temperature d. Ash – liquefaction temperature Answer: A * Energy added to a vapor is known as a latent heat of vaporization a. Latent heat of vaporization b. Sensible heat of vapor c. Superheat d. B and C Answer: C * During the compression process, the internal energy of the refrigerant vapor a. Increases b. Decreases

Answer: C * 10 kg of water at 60˚C receives 42,000kJ of heat coming from the surrounding. Assuming it is open to the atmosphere, how many kilograms of water will be vaporized? a. 18 kg b. 15 kg c. 10 kg d. 20 kg Answer: A * Which of the following processes does not alter the kinetic energy level of a substance? a. Fusion b. Adding sensible heat to a solid c. Adding sensible heat to a liquid d. Superheating a vapor Answer: A * A channel which leads water to a turbine is called a. Canal b. Tailrace c. Penstock d. Headrace Answer: D * A type of coal that tends to break apart as it burns thereby exposing the unburned coal to the combustion air. a. loose coal b. free burning coal c. non-cohesive coal d. aggregate

Answer: C * Answer: B * Which of the following components of the window air conditioning system cleaned annually? a. Evaporator and condenser b. Fan blades and fan motor c. Motor and compressor d. All of these Answer: D * A 5m thick flat plane (k=60 w/m k) is well insulated on its sides, while the top and bottom surfaces are maintained at 150 degrees. Assuming, a steady state heat conduction, calculate the temperature 4 m below the top surface. a. 100 deg c b. 120 deg c c. 94 deg c d. 80 deg c Answer: C * For vertical suction lines, the velocity should be a. 6.1 m/s – 7.1 m/s b. 3.8 m/s – 4.8 m/s c. 7.5 m/s – 8.5 m/s d. 10.5 m/s – 11.5 m/s Answer: A *

A boom – type mobile crane mounted on endless tracks or treated belts a. Crawler crane b. Gantry crane c. Hammerhead crane d. Jib crane Answer: A * A cushioning device at the end of a trolley, bridge or other moving parts of a crane operating on rails to minimize shock in the event of collision a. Bumper b. Bridge c. Buffer d. Cover Answer: C * Fuel production process wherein heavy oil is changed into gasoline by means of a high pressure, high temperature and longer exposure time a. Catalytic cracking b. Thermal cracking c. Hydrogenation d. Alkylation Answer: B *

The main cause of air pollution as result of burning of fuel oils is a. Sulfur dioxide b. Silicon dioxide c. Hydrogen dioxide d. Nitrogen dioxide

Pump whose purpose is to increase the effective water pressure by sucking water from a public service main or private – use water system a. Horizontal split – case pump b. Vertical shaft turbine pump c. Booster pump d. Submersible pump

Answer: D *

Answer: C *

Part of a valve used to guide and support the valve stem a. Spigot joint b. Saddle flange c. Bull head tee d. Bonnet

Plastics on thin layers of metals are used in nuclear plants a. To stop electrons b. To slow down neutrons c. To stop alpha and beta particles d. To arrest stray neutrons

Answer: D *

Answer: C *

Alcohol most frequently considered as fuel for internal combustion engine a. Methyl alcohol b. Isopropyl alcohol c. Ethyl alcohol d. None of the above

Which of the following is not a requirement in designing pipe installations? a. All pipings should be run parallel to building walls b. Minimum factor of safety of 4 for working pressure applied c. Galvanized pipe should be used for steam

d. All piping to header shall come from back rack Answer: C * A 3 cm layer asbestos (k = 20 W/m 0C) is used for a pipe (k = 20 W/m 0C) with 10 cm inside diameter and 12 cm outer diameter. The inside wall temperature of the pipe is maintained at 500 degree C while the outside surface of asbestos at 90 degree C. Calculate the heat loss per meter length. a. 1265 W/m b. 1500 W/m c. 1400 W/m d. 1100 W/m Answer: A * A circular chip (k = 150 W/m k) with a diameter d=10mm and thickness t = 4 mm is embedded in a circuit board. Its surface is exposed to the flow of a coolant (h = 250 W/m2 k, T = 10 degrees C) while its side and back surface are perfectly insulated. If at any point in the chip the temp must not exceed 90 degrees C, what is the steady state heat dissipation of the chip?

a. b. c. d.

2.5 2.0 1.6 1.8

W W W W

Answer: C * A 250 mm concrete wall is to be replaced by a composite wall. The heat rate through the replacement must be 80% of the rate through the concrete wall. If the ratio of their thermal conductivities is 2, determine the required thickness of the composite wall a. 156.3 mm b. 180 mm c. 200 mm d. 165 mm Answer: A * A Pelton wheel is known as a. Tangential turbine b. Radial flow turbine c. Axial flow turbine d. Excelsior turbine Answer: A *