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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.
| 51. |
Film contrast is the inherent ability of a film to show for a given change in film exposure. |
| A. | No appreciable change in density |
| B. | Graininess |
| C. | A difference in density |
| D. | No graininess |
| Answer» D. No graininess | |
| 52. |
A magnetic particle build-up from a discontinuity is strongest when the discontinuity is oriented: |
| A. | 180o to the magnetic field |
| B. | 45o to the magnetic field |
| C. | 90o to the magnetic field |
| D. | 90o to the current flow |
| Answer» D. 90o to the current flow | |
| 53. |
A weld discontinuity which consists of unmelted joint surfaces at the root, and which may be caused by poor fit- up, is called: |
| A. | Hot short cracking |
| B. | A slag inclusion |
| C. | Incomplete penetration |
| D. | Burn through |
| Answer» D. Burn through | |
| 54. |
A weld discontinuity which consists of unmelted joint surfaces at the root, and which may be caused by poor fit-up, is called: |
| A. | Hot short cracking |
| B. | A slag inclusion |
| C. | Incomplete penetration |
| D. | Burn through |
| Answer» D. Burn through | |
| 55. |
A depression at the edge of a weld where the base metal has been melted during welding is called: |
| A. | Burn through |
| B. | Undercut |
| C. | Root concavity |
| D. | Root convexity |
| Answer» C. Root concavity | |
| 56. |
What action is necessary if the penetrant is inadvertently allowed to dry on the test piece? |
| A. | Repeat the test, beginning with the pre-cleaning operation |
| B. | Re-wet the penetrant, begin dwell time again and continue |
| C. | Clean the penetrant off the surface and develop normally |
| D. | Clean the penetrant off the surface, wait 5 minutes and develop normally |
| Answer» B. Re-wet the penetrant, begin dwell time again and continue | |
| 57. |
According to ASTM E709-95 and API, the UV intensity measured at a minimum of 38 cm (15 inches) at least shall not be less than: |
| A. | 700 W/cm2 |
| B. | 800 W/cm2 |
| C. | 900 W/cm2 |
| D. | 1000 W/cm2 |
| Answer» E. | |
| 58. |
According to ASTM E709-95 and API, the thickness of non conductive coatings will not exceed: |
| A. | 1-10 mm |
| B. | 2-5 mm |
| C. | 0.02-0.05 mm |
| D. | 0.001-0.004 mm |
| Answer» D. 0.001-0.004 mm | |
| 59. |
According to API, the acceptable particle concentration of wet particle solution for fluorescent particles is: |
| A. | 0.1 to 0.4 mL by volume |
| B. | 0.1 to 0.5 mL by volume |
| C. | 0.1 to 0.6 mL by volume |
| D. | 0.1 to 0.7 mL by volume |
| Answer» B. 0.1 to 0.5 mL by volume | |
| 60. |
According to ASTM E709-95 in using prod technique on a 50 mm thickness plate with a prod spacing of 101 mm (4 inches), current shall be selected in the following range: |
| A. | 300-450A |
| B. | 400-500 A |
| C. | 500-625A |
| D. | 550-700 A |
| Answer» B. 400-500 A | |
| 61. |
The density of the radiograph through the weld area is 3.2 while the density in the base metal is 2.9. This would probably indicate: |
| A. | Too high a kV was used |
| B. | Too low a kV was used |
| C. | There is excessive weld reinforcement |
| D. | Weld underfill |
| Answer» E. | |
| 62. |
According to ASTM E709-95 powder shall be applied upon the part to be tested in such a manner that: |
| A. | A light uniform coating is formed |
| B. | In excess coating |
| C. | All of the above |
| D. | None of the above |
| Answer» B. In excess coating | |
| 63. |
Which of the following describes the shape of particles used for dry magnetic particle testing? |
| A. | Spherical |
| B. | Angular |
| C. | Elongated |
| D. | Mixture of elongated and globular |
| Answer» E. | |
| 64. |
A radiographic exposure with 3700 GBq (100 Ci) source of Ir-192 using source to film distance of 60 cm results in a radiation intensity of 0.12 Gy/h (11.8 R/h) and a radiographic density of 2.5. The intensity of radiation needed to obtain the same density when the source to film distance is changed to120 cm is: |
| A. | 0.472 Gy/h (47.2R/h) |
| B. | 0.118 Gy/h (11.8 R/h) |
| C. | 0.029 Gy/h (2.9 R/h) |
| D. | 0.236 Gy/h (23.6 R/h) |
| Answer» D. 0.236 Gy/h (23.6 R/h) | |
| 65. |
According to ASTM E709-95 and API, the temperature of the dry particles can be usable up to: |
| A. | 38 C |
| B. | 2000 C |
| C. | 49 C |
| D. | 315 C |
| Answer» E. | |
| 66. |
What is the longest period of time which should elapse between complete changes of developer solution? |
| A. | 1 week |
| B. | 2 weeks |
| C. | 1 month |
| D. | 3 months |
| Answer» E. | |
| 67. |
A low density image of the letter B on a radiographic film would probably be caused by: |
| A. | Under exposure |
| B. | Excessive exposure |
| C. | Excessive backscatter |
| D. | Insufficient backscatter |
| Answer» D. Insufficient backscatter | |
| 68. |
According to ASTM E709-95 and API, when fluorescent particles are used, the UV bulb shall warm up prior to use for at least: |
| A. | 1 minute |
| B. | 2 minutes |
| C. | 3 minutes |
| D. | 5 minutes |
| Answer» E. | |
| 69. |
According to ASTM E709-95 in using prods having a spacing of 19 mm (3/4 inches) and above, the magnetizing current shall be: |
| A. | From 90 to 110 A/25 mm (1 inch) |
| B. | From 100 to 125 A/25 mm (1 inch) |
| C. | From 90 to 120 A/ 25 mm (1 inch) |
| D. | From 100 to 200 A/25 mm (1 inch) |
| Answer» C. From 90 to 120 A/ 25 mm (1 inch) | |
| 70. |
According to ASTM E709-95 before turning off current and examination, dry powder in excess shall be: |
| A. | Removed by a dry-air current |
| B. | Kept in place |
| C. | All of the above |
| D. | None of the above |
| Answer» E. | |
| 71. |
Which type of penetrant process would be best suited to the detection of wide, shallow discontinuities? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» D. Fluorescent | |
| 72. |
A magnetic particle indication is sharp and very fine; this suggests that the discontinuity is: |
| A. | Subsurface seam |
| B. | A shallow, tight surface crack |
| C. | Porosity |
| D. | A deep crack |
| Answer» C. Porosity | |
| 73. |
If the radiation intensity is 5 Gy/h (500 R/h) at a distance of 152.4 cm (5 feet) from a source, what is the intensity at 1524 cm (50 feet)? |
| A. | 0.5 Gy/h (50 R/h) |
| B. | 1.0 Gy/h (100 R/h) |
| C. | 0.1 Gy/h (10R/h) |
| D. | 0.05 Gy/h (5 R/h) |
| Answer» E. | |
| 74. |
If the required exposure time for a 1850 GBq (50 curie) Ir-192 source is 4 minutes, what exposure time would be required for 925 GBq (25 curie) source: |
| A. | 4 minutes |
| B. | 8 minutes |
| C. | 2 minutes |
| D. | 16 minutes |
| Answer» C. 2 minutes | |
| 75. |
If the required exposure time for a 2220 GBq (60 curie) Ir-192 source is 2 minutes, what exposure time would be required at 1110 GBq (30 curie) source: |
| A. | 2/3 minutes |
| B. | 60 minutes |
| C. | 2 minutes |
| D. | 4 minutes |
| Answer» E. | |
| 76. |
According to ASTM E709-95 when applying fluorescent magnetic particles technique, the operator shall be in darkness area at least......................prior to examination: |
| A. | 2 min |
| B. | 3 min |
| C. | 4 min |
| D. | 5 min |
| Answer» C. 4 min | |
| 77. |
If the radiation intensity is 1 Gy/h (100 R/h) at a distance of 152.4 cm (5 feet) from a source, what is the intensity at 610 cm (20 feet)? |
| A. | 0.0625 Gy/h (6.25 R/h) |
| B. | 0.25 Gy/h (25 R/h) |
| C. | 16 Gy/h (1600 R/h) |
| D. | 4 Gy/h (400 R/h) |
| Answer» B. 0.25 Gy/h (25 R/h) | |
| 78. |
According to ASTM E709-95 when fluorescent particles are used, the bulb shall be warmed up prior to use for at least: |
| A. | 1 min |
| B. | 2 min |
| C. | 3 min |
| D. | 4 min |
| Answer» E. | |
| 79. |
According to ASTM E709-95 when fluorescent particles are used, the UV light intensity shall be above: |
| A. | 700 W/cm2 |
| B. | 800 W/cm2 |
| C. | 900 W/cm2 |
| D. | 1000 W/cm2 |
| Answer» E. | |
| 80. |
If the required X ray exposure time for a 225 kV, 5 mA exposure is 3 minutes, approximately what exposure time would be required at 10 mA? |
| A. | 1/2 minute |
| B. | 1 minute |
| C. | 1.5 minutes |
| D. | 3 minutes |
| Answer» D. 3 minutes | |
| 81. |
If the required X ray exposure time for a 150 kV, 5 mA exposure is 2 minutes, approximately what exposure time would be required at 10 mA? |
| A. | 1/2 minute |
| B. | 1 minute |
| C. | 2 minutes |
| D. | 4 minutes |
| Answer» C. 2 minutes | |
| 82. |
Which of the following techniques would probably reduce the amount of back scattered radiation reaching the film during a radiographic exposure? |
| A. | Using a finer grained film |
| B. | Backing the cassette with a sheet of lead |
| C. | Removing lead screens |
| D. | All of the above |
| Answer» C. Removing lead screens | |
| 83. |
For a 7.6 cm (3 inches) diameter bar how much current is needed to magnetize the bar for the detection of longitudinal discontinuities: |
| A. | 5500 amperes |
| B. | 16500 amperes |
| C. | 1000 amperes |
| D. | 3000 amperes |
| Answer» E. | |
| 84. |
Which of the following is an advantage of gamma ray over X ray sources for radiography? |
| A. | Portability |
| B. | No external power supply needed |
| C. | Ruggedness |
| D. | All of the above |
| Answer» E. | |
| 85. |
Gamma ray or high voltage X ray radiography, using film without lead screens, is likely to result in: |
| A. | Mottling of the film |
| B. | Increased geometric unsharpness |
| C. | No apparent difference, but increased exposure time |
| D. | No apparent difference, but decreased exposure time |
| Answer» B. Increased geometric unsharpness | |
| 86. |
When a longitudinal wave is incident upon an inclined interface and is refracted at ninety degrees, the angle of the incident longitudinal wave is called: |
| A. | The Snell constant |
| B. | The Snell angle |
| C. | The mode conversion constant |
| D. | The first critical angle |
| Answer» E. | |
| 87. |
Which of the following is an advantage of X ray over gamma ray sources for radiography? |
| A. | Safety |
| B. | Variable radiation intensity |
| C. | Variable radiation energy |
| D. | All of the above |
| Answer» E. | |
| 88. |
Natural discontinuities comparable in size to the penetrameter holes shown on a radiograph may not be detected because: |
| A. | Natural discontinuities may contain less dense material than the penetrameter holes |
| B. | Natural discontinuities may be thicker than the penetrameter holes |
| C. | Natural discontinuities do not necessarily have as sharp edges as the penetrameter holes |
| D. | All of the above |
| Answer» D. All of the above | |
| 89. |
An increase in gain of how many decibels corresponds to a 5:1 increase in flaw echo amplitude? |
| A. | 10 |
| B. | 14 |
| C. | 6 |
| D. | 20 |
| Answer» C. 6 | |
| 90. |
The degree of concentration of the radioactive material in gamma ray sources is referred to as the: |
| A. | Atomic weight of the source |
| B. | Half-life of the source |
| C. | Quality of the source |
| D. | Specific activity of the source |
| Answer» B. Half-life of the source | |
| 91. |
For gamma ray sources, radiographic intensity is proportional to source activity in gigabecquerels or curies for: |
| A. | All sources |
| B. | Large sources |
| C. | Small sources |
| D. | None of the above |
| Answer» B. Large sources | |
| 92. |
Radiography of tubular sections using a double wall, double viewing technique is mainly applicable to sections: |
| A. | Over 38 mm in diameter |
| B. | 88 mm in diameter or less |
| C. | 125 mm in diameter and less |
| D. | Under 25 mm in diameter |
| Answer» C. 125 mm in diameter and less | |
| 93. |
Most scattered radiation which adversely affects the radiographic image quality originates: |
| A. | From floors and walls adjacent to the test piece |
| B. | From other nearby objects |
| C. | From the test piece itself |
| D. | From the lead intensifying screens |
| Answer» B. From other nearby objects | |
| 94. |
How many ampere-turns are required to magnetize a part that is 40.6 cm (16 inches) long and 5 cm (2 inches) in diameter? |
| A. | 9000 ampere-turns |
| B. | 5625 ampere-turns |
| C. | 2812 ampere-turns |
| D. | None of the above |
| Answer» C. 2812 ampere-turns | |
| 95. |
What is the magnetic field strength at the surface of a 25 mm diameter bar as compared to that at the surface of a 50 mm diameter bar, each carrying 1000 amps of current? |
| A. | Twice |
| B. | One half |
| C. | One quarter |
| D. | Four times |
| Answer» B. One half | |
| 96. |
What is the magnetic field strength at the surface of a 25mm diameter bar as compared to that at the surface of a 50mm diameter bar, each carrying 1000 amps of current? |
| A. | Twice |
| B. | One half |
| C. | One quarter |
| D. | Four times |
| Answer» B. One half | |
| 97. |
The amount of amperage used for magnetic particle inspection using the prod method is determined from the: |
| A. | Type of material |
| B. | Distance between the prods |
| C. | Diameter of the part |
| D. | Total length of the part |
| Answer» C. Diameter of the part | |
| 98. |
What is the magnetic field strength at the surface of a 100 mm diameter bar as compared to that at the surface of a 50 mm diameter bar, each carrying 1000 amps of current? |
| A. | Twice |
| B. | One half |
| C. | One quarter |
| D. | Four times |
| Answer» C. One quarter | |
| 99. |
The most effective NDT method for locating surface cracks in ferromagnetic materials is: |
| A. | Ultrasonic testing |
| B. | Radiographic testing |
| C. | Magnetic particle testing |
| D. | Liquid penetrant testing |
| Answer» D. Liquid penetrant testing | |
| 100. |
A change in which the following parameters would require a new X ray exposure chart? |
| A. | kV |
| B. | X ray machine |
| C. | Test piece thickness |
| D. | All of the above |
| Answer» C. Test piece thickness | |