Basic Ndt - Nr Qb - 2.rtf
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Southern Inspection Services NR QB 1. Which of the following mechanism decsribes the heat flow from hot to cold within an object? a. Conduction b. Convection c.
Radiation
d. Convection and radiation 2. Material properties such as specific heat, density, thermal conductivity, thermal diffisivity and temperature will affect? a. Conduction b. Convection c.
Radiation
d. Conduction and convection 3. In radiation heat transfer which of the following material properties is most important? a. Density b. Emissivity c.
Specific heat
d. Diffusivity 4. As the average temperature of the subject increases, generally the thermal measurement techniqes become? a. Impossible b. Less sensitive c.
More sensitive
d. Unsuitable 5. Which of the following is a non contact temperature sensor? a. Pyrometer b. Thermopile c.
Cholestric liquid crystals
d. Thermally quenches phosphors
www.sisndt.com / www. ndtsis.com
Page 1
Southern Inspection Services 6. Which of the following is a contact temperature sensor? a. Radiometer b. Thermocouple c.
Thermal wave inferometer
7. Infrared thermography can be used for which of the following? a. Process control b. Liquid intrusions c.
Pelaminations
d. All of the above 8. Which of the following statements is true with respect to image interpretation? a. Large temperature differences are easy to interpret b. Large temperature differences are difficult to interpret c.
Surface anomalies produce stronger indications than subsurface anomalies
d. Large temperature differences are easy to interpret and Surface anomalies produce stronger indications than subsurface anomalies 9. Which of the following may be used for recording in imaging systems? a. Black and white photography b. Colour photography c.
Videotape recorder
d. All of the above 10. Which of the following statements is false with respect to cholestric liquid crystals? a. They are grease like b. They emit visible light when excited with UV light c.
The applied film must be of uniform thickness
d. Can be applied by brushing
www.sisndt.com / www. ndtsis.com
Page 2
Southern Inspection Services 11. In which of the following does Neutron Radiography differ from conventional radiography? a. Geometric principles of shadow formation b. Variation of attenuation with test piece thickness c.
Direct imaging on film
d. All of the above 12. Which of the following statements is false? a. X rays are attenuated more by elements of high atomic number b. X rays are attenuated more by materials of high density c.
Neutron attenuation are generally attenuated less with increasing atomic number
d. Hydrogen, lithium and boron are not attenuated by thermal neutrons 13. Which of the following radioactive isotopes produce thermal neutrons? a. Iridium 192 b. Californium 252 c.
Cobalt 60
d. Caesium 137 14. What metal is the target made of when producing thermal neutrons in a van de graaf generator? a. Lithium b. Beryllium c.
Cobalt
d. Tungsten 15. Which of the following is a problem with respect of using radioactive sources to produce thermal neutrons? a. Portability b. Fine grained film must be used c.
Long exposure times and the use of coarse grained film
d. No contrast on low atomic number materials
www.sisndt.com / www. ndtsis.com
Page 3
Southern Inspection Services 16. Which of the following applications can neutron radiography be used? a. Correct placement of adhesives b. Positioning of explosives c.
Presence of plastic components
d. All of the above 17. The detection of corrosion in aluminium aircraft components is best detected by? a. Eddy currents b. Visual inspection c.
Neutron radiography
d. Conventional radiography 18. In the transfer method of neutron detection of thin sheet of metal called a transfer screen is used which is generally made of? a. Indium b. Dysprosium c.
Gadolium
d. Indium and dysprosium 19. The transfer method is especially valuable for? a. Detection of corrosion b. Inspection of a radioactive specimen c.
Verify welding of dissimilar metals
d. Positioning O rings 20. In neutron radiography for a given material attenuation? a. Varies directly with thickness b. Is inversely proportional to thickness c.
Varies exponentially with thickness
d. Is inversely proportional to the thickness squared
www.sisndt.com / www. ndtsis.com
Page 4
Southern Inspection Services Here are the corrections: 1. Conduction 2. Conduction and convection 3. Emissivity 4. More sensitive 5. Pyrometer 6. Thermocouple 7. All of the above 8. Large temperature differences are easy to interpret and Surface anomalies produce stronger indications than subsurface anomalies 9. All of the above 10. They emit visible light when excited with UV light 11. Direct imaging on film 12. Hydrogen, lithium and boron are not attenuated by thermal neutrons 13. Californium 252 14. Beryllium 15. Long exposure times and the use of coarse grained film 16. All of the above 17. Neutron radiography 18. Indium and dysprosium 19. Inspection of a radioactive specimen 20. Is inversely proportional to thickness
www.sisndt.com / www. ndtsis.com
Page 5
Radiation
d. Convection and radiation 2. Material properties such as specific heat, density, thermal conductivity, thermal diffisivity and temperature will affect? a. Conduction b. Convection c.
Radiation
d. Conduction and convection 3. In radiation heat transfer which of the following material properties is most important? a. Density b. Emissivity c.
Specific heat
d. Diffusivity 4. As the average temperature of the subject increases, generally the thermal measurement techniqes become? a. Impossible b. Less sensitive c.
More sensitive
d. Unsuitable 5. Which of the following is a non contact temperature sensor? a. Pyrometer b. Thermopile c.
Cholestric liquid crystals
d. Thermally quenches phosphors
www.sisndt.com / www. ndtsis.com
Page 1
Southern Inspection Services 6. Which of the following is a contact temperature sensor? a. Radiometer b. Thermocouple c.
Thermal wave inferometer
7. Infrared thermography can be used for which of the following? a. Process control b. Liquid intrusions c.
Pelaminations
d. All of the above 8. Which of the following statements is true with respect to image interpretation? a. Large temperature differences are easy to interpret b. Large temperature differences are difficult to interpret c.
Surface anomalies produce stronger indications than subsurface anomalies
d. Large temperature differences are easy to interpret and Surface anomalies produce stronger indications than subsurface anomalies 9. Which of the following may be used for recording in imaging systems? a. Black and white photography b. Colour photography c.
Videotape recorder
d. All of the above 10. Which of the following statements is false with respect to cholestric liquid crystals? a. They are grease like b. They emit visible light when excited with UV light c.
The applied film must be of uniform thickness
d. Can be applied by brushing
www.sisndt.com / www. ndtsis.com
Page 2
Southern Inspection Services 11. In which of the following does Neutron Radiography differ from conventional radiography? a. Geometric principles of shadow formation b. Variation of attenuation with test piece thickness c.
Direct imaging on film
d. All of the above 12. Which of the following statements is false? a. X rays are attenuated more by elements of high atomic number b. X rays are attenuated more by materials of high density c.
Neutron attenuation are generally attenuated less with increasing atomic number
d. Hydrogen, lithium and boron are not attenuated by thermal neutrons 13. Which of the following radioactive isotopes produce thermal neutrons? a. Iridium 192 b. Californium 252 c.
Cobalt 60
d. Caesium 137 14. What metal is the target made of when producing thermal neutrons in a van de graaf generator? a. Lithium b. Beryllium c.
Cobalt
d. Tungsten 15. Which of the following is a problem with respect of using radioactive sources to produce thermal neutrons? a. Portability b. Fine grained film must be used c.
Long exposure times and the use of coarse grained film
d. No contrast on low atomic number materials
www.sisndt.com / www. ndtsis.com
Page 3
Southern Inspection Services 16. Which of the following applications can neutron radiography be used? a. Correct placement of adhesives b. Positioning of explosives c.
Presence of plastic components
d. All of the above 17. The detection of corrosion in aluminium aircraft components is best detected by? a. Eddy currents b. Visual inspection c.
Neutron radiography
d. Conventional radiography 18. In the transfer method of neutron detection of thin sheet of metal called a transfer screen is used which is generally made of? a. Indium b. Dysprosium c.
Gadolium
d. Indium and dysprosium 19. The transfer method is especially valuable for? a. Detection of corrosion b. Inspection of a radioactive specimen c.
Verify welding of dissimilar metals
d. Positioning O rings 20. In neutron radiography for a given material attenuation? a. Varies directly with thickness b. Is inversely proportional to thickness c.
Varies exponentially with thickness
d. Is inversely proportional to the thickness squared
www.sisndt.com / www. ndtsis.com
Page 4
Southern Inspection Services Here are the corrections: 1. Conduction 2. Conduction and convection 3. Emissivity 4. More sensitive 5. Pyrometer 6. Thermocouple 7. All of the above 8. Large temperature differences are easy to interpret and Surface anomalies produce stronger indications than subsurface anomalies 9. All of the above 10. They emit visible light when excited with UV light 11. Direct imaging on film 12. Hydrogen, lithium and boron are not attenuated by thermal neutrons 13. Californium 252 14. Beryllium 15. Long exposure times and the use of coarse grained film 16. All of the above 17. Neutron radiography 18. Indium and dysprosium 19. Inspection of a radioactive specimen 20. Is inversely proportional to thickness
www.sisndt.com / www. ndtsis.com
Page 5
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