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MCQOPTIONS
This section includes 335 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A term used to describe the range of radiation intensities falling on the film during exposure is: |
| A. | Film contrast |
| B. | Radiographic contrast |
| C. | Subject contrast |
| D. | Radiographic sensitivity |
| Answer» C. Subject contrast | |
| 2. |
The term used to describe the reaction of human reproductive cells, to ionizing radiation is: |
| A. | Genetic effects |
| B. | Somatic effects |
| C. | Corpuscular effects |
| D. | Hematological effects |
| Answer» B. Somatic effects | |
| 3. |
The term used to describe the reaction of human cells, other than reproductive cells, to ionizing radiation is: |
| A. | Genetic effects |
| B. | Somatic effects |
| C. | Corpuscular effects |
| D. | Hematological effects |
| Answer» C. Corpuscular effects | |
| 4. |
The amount of radioactivity which corresponds to 3.7 1010 disintegrations per second is called: |
| A. | 0.01 gray (1 rad) |
| B. | 1 Farad |
| C. | 37 GBq (1 curie) |
| D. | 10 mSv (1 roentgen) |
| Answer» D. 10 mSv (1 roentgen) | |
| 5. |
A method of compensating for the dead zone or near surface resolution problems is to: |
| A. | Inspect all areas of the test piece twice to assure repeatability of indications |
| B. | Re-inspect from the opposite side of the test piece if geometry permits |
| C. | Re-inspect using a higher energy pulse |
| D. | Re-inspect using a higher frequency transducer that does not have a dead |
| Answer» C. Re-inspect using a higher energy pulse | |
| 6. |
When a small diameter tube is placed in a glass of water, water rises in the tube to a level above the adjacent surface. This is called: |
| A. | Viscosity |
| B. | Capillary action |
| C. | Surface tension |
| D. | Barometric testing |
| Answer» C. Surface tension | |
| 7. |
A penetrant process in which excess penetrant is removed with an organic solvent is called: |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post-emulsified |
| D. | Dual method |
| Answer» B. Water washable | |
| 8. |
A penetrant process which employs an emulsifier as a separate step in the penetrant removal process is called: |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post-emulsified |
| D. | Dual sensitivity method |
| Answer» D. Dual sensitivity method | |
| 9. |
Which of the following statements accurately describes the capabilities of liquid penetrant testing? |
| A. | Liquid penetrant testing is useful for locating subsurface discontinuities in a test piece |
| B. | Liquid penetrant testing is useful for locating discontinuities in porous materials |
| C. | Liquid penetrant testing is useful for locating discontinuities which are open to the surface in non-porous materials |
| D. | none of the above |
| Answer» D. none of the above | |
| 10. |
How is the size of a liquid penetrant indication usually related to the discontinuity it represents: |
| A. | Larger than |
| B. | Smaller than |
| C. | Equal to |
| D. | Not related to |
| Answer» B. Smaller than | |
| 11. |
Which of the following discontinuity types could typically be found with a liquid penetrant test? |
| A. | Internal slag in a weld |
| B. | Internal slag in a casting |
| C. | Sensitization in austenitic stainless steel |
| D. | Fatigue cracks |
| Answer» E. | |
| 12. |
Which of the following chemical elements are normally held to a minimum in liquid penetrant materials, when testing stainless steel and titanium? |
| A. | Hydrogen |
| B. | Chlorine |
| C. | Carbon |
| D. | Oil |
| Answer» C. Carbon | |
| 13. |
Which of the following chemical elements are normally held to a minimum in liquid penetrant materials when testing nickel based alloys? |
| A. | Sulphur |
| B. | Oxygen |
| C. | Carbon |
| D. | Nitrogen |
| Answer» B. Oxygen | |
| 14. |
Which of the following is the most desirable method of pre-cleaning a test piece prior to penetrant testing? |
| A. | Sand blasting |
| B. | Vapour degreasing |
| C. | Emery cloth |
| D. | Wire brushing |
| Answer» C. Emery cloth | |
| 15. |
For adequate test results, the black light used in fluorescent penetrant examination should provide what minimum black light intensity at the test surface? |
| A. | 100 foot candles per square centimetre |
| B. | 1000 microwatts per square centimetre |
| C. | 800 foot candles |
| D. | 35 microwatts per square centimetre |
| Answer» C. 800 foot candles | |
| 16. |
What minimum warm-up time is required for acceptable performance of a mercury Vapour arc black light? |
| A. | None |
| B. | 2 minutes |
| C. | 5 minutes |
| D. | 10 minutes |
| Answer» D. 10 minutes | |
| 17. |
Which of the following penetrants must be treated with an emulsifier prior to water removal? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» D. Fluorescent | |
| 18. |
A penetrant testing method in which an emulsifier, separate from the penetrant, is used is called: |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifying |
| D. | Self emulsifying |
| Answer» D. Self emulsifying | |
| 19. |
When using a hydrophilic emulsifier, the amount of penetrant removed is most affected by: |
| A. | Solution strength and time of spray |
| B. | Penetrant dwell time |
| C. | Emulsifier dwell time |
| D. | Adequacy of pre-clean |
| Answer» B. Penetrant dwell time | |
| 20. |
Which of the following is used in connection with hydrophilic emulsifier applied by immersion? |
| A. | Brushing |
| B. | Agitation |
| C. | Drain-dwell |
| D. | All of the above |
| Answer» C. Drain-dwell | |
| 21. |
What maximum water rinse pressure is considered safe for removal of excess penetrant in the water washable penetrant process? |
| A. | As low a pressure as possible, 50 PSI maximum |
| B. | to 200 PSI |
| C. | PSI maximum |
| D. | to 500 PSI |
| Answer» B. to 200 PSI | |
| 22. |
During the water rinse step of the water washable penetrant process, what is the desired angle of the spray to the surface? |
| A. | Normal |
| B. | 30 degrees |
| C. | 45 degrees |
| D. | 75 degrees |
| Answer» D. 75 degrees | |
| 23. |
The temperature of water rinse used in the water washable penetrant process should be: |
| A. | 60 to 110oC |
| B. | 40 to 100oC |
| C. | 16 to 43oC |
| D. | 70 to 140oC |
| Answer» D. 70 to 140oC | |
| 24. |
When using a water washable penetrant testing process, why should the water rinse temperature remain constant? |
| A. | To avoid changes in rinse efficiency |
| B. | To maintain the temperature of the part |
| C. | To avoid over washing |
| D. | To avoid under washing |
| Answer» D. To avoid under washing | |
| 25. |
What additional surface preparation or cleaning must be performed on a machined or ground aluminium casting prior to penetrant testing? |
| A. | Vapour degreasing |
| B. | Etching |
| C. | Detergent wash |
| D. | Nothing |
| Answer» C. Detergent wash | |
| 26. |
The advantages of using a visible solvent removable penetrant versus a post emulsified fluorescent penetrant is: |
| A. | No UV light is needed |
| B. | The technique is well suitable for site tests or spot checks |
| C. | No water or emulsifiers are needed |
| D. | No extra equipment is needed |
| Answer» E. | |
| 27. |
Liquid penetrants can be further categorised by the removal method of excess surface penetrant: |
| A. | Water washable |
| B. | Solvent removable |
| C. | Post emulsified |
| D. | All of the above |
| Answer» E. | |
| 28. |
A magnetic particle testing technique in which the test piece is magnetised and magnetic particles applied after the magnetising force has been removed is called the: |
| A. | Magnetic method |
| B. | Continuous method |
| C. | Residual method |
| D. | Discontinuous method |
| Answer» D. Discontinuous method | |
| 29. |
The magnetism which remains in a piece of magnetisable material after the magnetising force has been removed is called the: |
| A. | Tramp field |
| B. | Residual field |
| C. | Damped field |
| D. | Permanent field |
| Answer» C. Damped field | |
| 30. |
The ability of a material to remain magnetic after the magnetising force is removed is called: |
| A. | Reluctance |
| B. | Retentivity |
| C. | Permeability |
| D. | Electromagnetism |
| Answer» C. Permeability | |
| 31. |
For direct contact magnetising methods, the magnetic field is oriented in what direction relative to the current direction? |
| A. | Parallel |
| B. | At 45 degrees |
| C. | At 90 degrees |
| D. | At 180 degrees |
| Answer» D. At 180 degrees | |
| 32. |
For direct contact magnetising methods, the magnetic field is oriented in what direction relative to the current direction? |
| A. | Parallel |
| B. | At 45o |
| C. | At 90o |
| D. | At 180o |
| Answer» D. At 180o | |
| 33. |
Over washing during excess penetrant removal is less likely with which penetrant testing process? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Self emuslifying |
| Answer» C. Post emulsifiable | |
| 34. |
Contrast is defined as the comparison between on different areas of the radiograph: |
| A. | Density |
| B. | Sensitivity |
| C. | Sharpness |
| D. | Latitude |
| Answer» B. Sensitivity | |
| 35. |
It is easier to control developer coating thickness with a soluble developer than a water suspendable one because: |
| A. | Less developer can be dissolved that suspended in water |
| B. | It dries more rapidly on the test piece |
| C. | Evaporation deposits a thin, even coating on the test piece |
| D. | All of the above |
| Answer» E. | |
| 36. |
Fluorescent penetrant indications are more visible than colour contrast penetrant indications because: |
| A. | They reflect more light |
| B. | They emit rather than reflect light |
| C. | They contain a higher concentration of dye particles |
| D. | Yellow and green contrast more than red and white |
| Answer» C. They contain a higher concentration of dye particles | |
| 37. |
According to ASTM E709-95 the viscosity limit (measured in centi Stokes) of the wet medium (conditioned water) should not exceed: |
| A. | 1 cSt |
| B. | 3 cSt |
| C. | 6 cSt |
| D. | 4 cSt |
| Answer» D. 4 cSt | |
| 38. |
Which of the following conditions would be most likely to cause strong, interfering surface waves? |
| A. | High frequency transducers |
| B. | Testing on a small diameter surface |
| C. | Testing on a flat surface |
| D. | Testing on a curved surface with a contoured wedge and transducer |
| Answer» E. | |
| 39. |
Reflection indications from a weld area being inspection by the angle beam technique may represent: |
| A. | Porosity |
| B. | Cracks |
| C. | Weld bead |
| D. | All of the above |
| Answer» E. | |
| 40. |
Contrast and definition are the two major factors that determine the of the radiograph: |
| A. | Density |
| B. | Sensitivity |
| C. | Graininess |
| D. | Intensity |
| Answer» C. Graininess | |
| 41. |
Definition is defined as the measure of the of the outline of the image in the radiograph. |
| A. | Density |
| B. | Sensitivity |
| C. | Sharpness |
| D. | Latitude |
| Answer» D. Latitude | |
| 42. |
According to ASME Section VIII, a linear indication is defined as an indication in which the length is equal to or greater than the width by a factor of: |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 43. |
A dark, irregular indication which is located adjacent to the toe of the weld would probably be: |
| A. | Undercut |
| B. | Incomplete penetration |
| C. | Porosity |
| D. | Tungsten inclusions |
| Answer» B. Incomplete penetration | |
| 44. |
A radiographic indication in a weld, characterised by two parallel dark lines in the film image, would probably be caused by: |
| A. | Incomplete penetration |
| B. | Lack of fusion |
| C. | Slag inclusions |
| D. | Tungsten inclusions |
| Answer» C. Slag inclusions | |
| 45. |
A casting flaw which is formed when two masses of molten metal flowing from different directions flow together, but fail to fuse, is called: |
| A. | A hot tear |
| B. | Shrinkage |
| C. | A cold crack |
| D. | A cold shut |
| Answer» E. | |
| 46. |
A straight, dark line in the centre of a weld bead image on film would be suspected of being: |
| A. | Lack of fusion |
| B. | A crack |
| C. | Incomplete penetration |
| D. | Root concavity |
| Answer» D. Root concavity | |
| 47. |
When a casting is being non destructively examined for critical service, and the possibility of cracks exists, which of the following techniques would be best? |
| A. | X ray radiography at 200 kV or less |
| B. | Magnetic Particle or Liquid Penetrant testing |
| C. | Radiography (X or gamma ray, depending on the thickness) |
| D. | Radiography and either Magnetic Particle or liquid Penetrant testing |
| Answer» C. Radiography (X or gamma ray, depending on the thickness) | |
| 48. |
According to ASTM E709-95 and API, a linear indication is defined as an indication in which the length is equal to or greater than the width by a factor of: |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 49. |
A dark crescent shaped mark in the centre of a weld bead radiographic image would probably be: |
| A. | A film artifact |
| B. | Porosity |
| C. | A tungsten inclusion |
| D. | Root concavity |
| Answer» B. Porosity | |
| 50. |
Use of a slower speed film improves the definition of the radiograph because the slower film: |
| A. | Requires more exposure |
| B. | Is more sensitive to X rays |
| C. | Requires less voltage |
| D. | Has finer grains |
| Answer» E. | |