McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
Chapters
| 51. |
Which of the following is normally prohibited as a method of removing excess penetrant when using the solvent removable penetrant process? |
| A. | A water spray |
| B. | A hydrophilic scrubber |
| C. | A solvent spray |
| D. | Clean with lint free towels moistened with solvent |
| Answer» C. A solvent spray | |
| 52. |
When performing a fluorescent penetrant examination, excess penetrant is normally removed: |
| A. | By a hydrophilic scrubber |
| B. | Under UV light |
| C. | By solvent spray |
| D. | By vapour degreasing |
| Answer» B. Under UV light | |
| 53. |
During a visible, solvent removable penetrant test, complete penetrant removal is indicated by: |
| A. | Absence of red indications on the test piece surface |
| B. | Clean rinse water |
| C. | Completion of the rinse cycle |
| D. | Absence of red dye on the cleaning towels |
| Answer» D. Absence of red dye on the cleaning towels | |
| 54. |
Which of the following is a function of a developer |
| A. | Providing a contrasting background for visible dye indications |
| B. | Making the penetrant water washable |
| C. | Penetrating into discontinuities open to the surface |
| D. | Dissolve organic soils on the test piece surface |
| Answer» A. Providing a contrasting background for visible dye indications | |
| 55. |
Which of the following is a function of a developer? |
| A. | Providing a contrasting background for visible dye indications |
| B. | Accentuates presence of discontinuities by causing a penetrant indication to spread out over a larger area |
| C. | Provides capillary paths to aid the bleed out process |
| D. | All of the above |
| Answer» D. All of the above | |
| 56. |
Which of the following developers is applied before the drying operation? |
| A. | Dry |
| B. | Non-aqueous wet |
| C. | Water based wet |
| D. | None of the above |
| Answer» C. Water based wet | |
| 57. |
The most sensitive type of developer for the detection of fine discontinuities is: |
| A. | Water soluble |
| B. | Non-aqueous wet |
| C. | Dry |
| D. | Water suspendable |
| Answer» B. Non-aqueous wet | |
| 58. |
Which of the following is the most sensitive developer in descending order? |
| A. | Dry, water soluble, water suspendable |
| B. | Non-aqueous wet, water soluble, water suspendable ,dry |
| C. | Non-aqueous wet, dry, water soluble |
| D. | Water suspendable, water soluble, non-aqueous wet |
| Answer» B. Non-aqueous wet, water soluble, water suspendable ,dry | |
| 59. |
Low sulphur and chlorine penetrant materials would be used for testing: |
| A. | Aluminium, steel and plastics |
| B. | Tool steels, chrome vanadium steel and ferritic stainless steels |
| C. | Austenitic stainless steels, nickel alloys and titanium |
| D. | Magnetic materials |
| Answer» C. Austenitic stainless steels, nickel alloys and titanium | |
| 60. |
Which type of developer may be either in suspension or a solution? |
| A. | Dry |
| B. | Non-aqueous wet |
| C. | Water based wet |
| D. | None of the above |
| Answer» C. Water based wet | |
| 61. |
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» C. 16 to 43oC | |
| 62. |
The danger of over washing during a water washable penetrant test is that: |
| A. | Excess penetrant will be removed from the test piece |
| B. | Penetrant will be removed from discontinuities |
| C. | The waste water will contain too high a concentration of penetrants |
| D. | A protective oxide coating on the test piece is formed |
| Answer» B. Penetrant will be removed from discontinuities | |
| 63. |
Which penetrant process is best suited to high production rates of many small parts? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» B. Water washable | |
| 64. |
Which penetrant process is best suited to detect shallow discontinuities? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» C. Post emulsifiable | |
| 65. |
Which penetrant process is best suited to the detection of discontinuities in a test piece having threads and keyways? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» B. Water washable | |
| 66. |
Which penetrant process is the most sensitive to detect fine discontinuities? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable fluorescent |
| D. | Water washable fluorescent |
| Answer» C. Post emulsifiable fluorescent | |
| 67. |
Which penetrant process is best suited for portable application in the field? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» A. Solvent removable | |
| 68. |
Which penetrant process should be used if repeated examinations are anticipated? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» A. Solvent removable | |
| 69. |
What is a disadvantage of using the fluorescent penetrant process? |
| A. | Lower visibility of indications |
| B. | Must be performed in a darkened area with aid of a UV lamp |
| C. | Easily washed with water |
| D. | High visibility of indications |
| Answer» B. Must be performed in a darkened area with aid of a UV lamp | |
| 70. |
Which of the following developers is applied by brush, spraying or dipping? |
| A. | Non-aqueous wet |
| B. | Water based wet |
| C. | Dry |
| D. | Dual sensitivity |
| Answer» B. Water based wet | |
| 71. |
Which of the following developers is applied by spray only? |
| A. | Non-aqueous wet |
| B. | Water based wet |
| C. | Dry |
| D. | Dual sensitivity |
| Answer» A. Non-aqueous wet | |
| 72. |
Which of the following developers is applied by immersion or flow on only? |
| A. | Non-aqueous wet |
| B. | Water based wet |
| C. | Dry |
| D. | Dual sensitivity |
| Answer» B. Water based wet | |
| 73. |
What is the minimum time considered necessary for dark adaptation of the eyes prior to evaluating the results of a fluorescent penetrant test? |
| A. | 1 minute |
| B. | 2 minutes |
| C. | 5 minutes |
| D. | 10 minutes |
| Answer» C. 5 minutes | |
| 74. |
What is the likely result of looking directly into a black light? |
| A. | Burning of the retina of the eye |
| B. | Temporary inflammation of the cornea |
| C. | Long term tendency toward formation of cataracts |
| D. | Fluorescence of the fluid in the eye |
| Answer» D. Fluorescence of the fluid in the eye | |
| 75. |
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» C. Post emulsifiable | |
| 76. |
Which type of penetrant process affords most control of test sensitivity level? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» C. Post emulsifiable | |
| 77. |
Which type of penetrant process is least susceptible to over washing? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» C. Post emulsifiable | |
| 78. |
What is a disadvantage of the solvent removable penetrant process? |
| A. | It is the least sensitive of the penetrant processes |
| B. | It is not well suited for use on rough surfaces |
| C. | It is highly portable |
| D. | No water is required for its use |
| Answer» B. It is not well suited for use on rough surfaces | |
| 79. |
Which of the following is the proper first step in removal of excess penetrant when using the solvent removable penetrant process? |
| A. | Immerse the test piece in solvent |
| B. | Spray the test piece with water |
| C. | Wipe the test piece surface with clean, lint free towels slightly moistened |
| D. | All of the above is correct |
| Answer» C. Wipe the test piece surface with clean, lint free towels slightly moistened | |
| 80. |
Which of the following types of penetrants, developers, solvents are used when conducting a liquid penetrant test on a part that is exposed to a liquid oxygen environment. |
| A. | Water based penetrants |
| B. | Water based developers |
| C. | Water based solvents |
| D. | All of the above |
| Answer» A. Water based penetrants | |
| 81. |
The causes of non relevant indications are: |
| A. | Insufficient removal of excess surface penetrant |
| B. | Penetrant on operators hands |
| C. | Threads, keyways, splines, sharp corners, press fits, blind holes, rough surfaces |
| D. | Contaminated work surfaces |
| Answer» C. Threads, keyways, splines, sharp corners, press fits, blind holes, rough surfaces | |
| 82. |
Which of the following metals must be tested with low halogen sulphur free penetrant materials: |
| A. | Copper, silver, gold |
| B. | Nickel based alloys, certain stainless steel materials |
| C. | Steel, iron, aluminium |
| D. | Plastic, wood, paper |
| Answer» D. Plastic, wood, paper | |
| 83. |
Penetrant testing is limited by its inability to test which of the following materials: |
| A. | Aluminium |
| B. | Ceramics |
| C. | Porous materials |
| D. | Moulded rubber |
| Answer» D. Moulded rubber | |
| 84. |
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» A. Water washable | |
| 85. |
The typical temperature ranges for conducting a liquid penetrant test is: |
| A. | 60 to 100ºC |
| B. | 10 to 60ºF |
| C. | 16 to 52ºC |
| D. | 10 to 20ºK |
| Answer» B. 10 to 60ºF | |
| 86. |
Surface breaking porosity will show what type of relevant indications when a welded aluminium plate is tested with the liquid penetrant method: |
| A. | Linear indications |
| B. | Square indications |
| C. | Triangular indications |
| D. | Rounded indications |
| Answer» B. Square indications | |
| 87. |
Cracks, lack of penetration, lack of fusion which are surface breaking on a welded aluminium plate which has been liquid penetrant tested will show as: |
| A. | Linear indications |
| B. | Rounded indications |
| C. | Square indications |
| D. | Triangular indications |
| Answer» C. Square indications | |
| 88. |
Which of the following methods is not recommended for pre-cleaning prior to a liquid penetrant test: |
| A. | Steam cleaning, etching, rust and paint removal |
| B. | Solvent wipe, vapour degreasing, ultrasonic bath cleaning |
| C. | Blasting, grinding, filing, honing, machining |
| D. | All of the listed methods are not recommended |
| Answer» D. All of the listed methods are not recommended | |
| 89. |
The purpose of using a developer is: |
| A. | To create a contrasting background for the penetrants to ensure better visibility of indications |
| B. | Assists in reverse capillary action due to absorption ability of developers |
| C. | Prevent the part from corroding after the liquid penetrant test |
| D. | To ensure that the part has been correctly heat treated |
| Answer» B. Assists in reverse capillary action due to absorption ability of developers | |
| 90. |
The typical sequence of conducting a visible solvent removable penetrant is: |
| A. | Pre-clean with a solvent wipe method |
| B. | Apply visible penetrant, keep wet, dwell time of 2 minutes |
| C. | Pour solvent on surface of part and wipe with waste cloth |
| D. | Spray on a thick layer of developer |
| Answer» D. Spray on a thick layer of developer | |
| 91. |
The principle on which liquid penetrant testing is based on is: |
| A. | Capillary action of the penetrant |
| B. | Capillary action of cleaner/solvent |
| C. | Capillary action of developer |
| D. | None of the listed is correct |
| Answer» A. Capillary action of the penetrant | |
| 92. |
The limitation of a liquid penetrant test is: |
| A. | Only surface breaking discontinuities can be detected if chemically and physically clean and dry |
| B. | Porous materials cannot be tested |
| C. | There is cleaning problem following penetrant inspection in some cases |
| D. | All of the listed limitations are correct |
| Answer» B. Porous materials cannot be tested | |
| 93. |
Penetrants may be applied to the surface of part by : |
| A. | Spraying |
| B. | Dipping |
| C. | Pouring |
| D. | All of the above methods are acceptable |
| Answer» B. Dipping | |
| 94. |
Which of the following is a reason to post clean a part after a liquid penetrant test: |
| A. | The part might be further processed |
| B. | If repairs are necessary |
| C. | Developers absorb moisture and may result in part being corroded |
| D. | All of the reasons are correct |
| Answer» C. Developers absorb moisture and may result in part being corroded | |
| 95. |
Which of the following penetrant has a built-in emulsifier |
| A. | Water washable |
| B. | Solvent removable |
| C. | Post emulsified |
| D. | All of the listed above |
| Answer» A. Water washable | |
| 96. |
Liquid penetrants can be classified into the types of dyes they contain: |
| A. | Visible/colour contrast |
| B. | Fluorescent |
| C. | Dual sensitivity |
| D. | All of the listed is correct |
| Answer» D. All of the listed is correct | |
| 97. |
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» D. No extra equipment is needed | |
| 98. |
The following precautions must be observed when removing the excess surface penetrant with a water wash method using a hose pipe: |
| A. | The wash angle should be at 45o |
| B. | A coarse droplet spray |
| C. | Temperature of water 16 to 43oC |
| D. | Pressure as low as possible not to exceed 50 psi |
| Answer» B. A coarse droplet spray | |
| 99. |
The typical causes for false indications are: |
| A. | Threads, keyways, splines, rough surfaces |
| B. | Sharp corners, pop rivets |
| C. | Insufficient removal of excess surface penetrant, penetrant on operators’ hands, using cloth/paper towels which are not lint free, dirty work surfaces |
| D. | Over washing with high pressure hose pipes |
| Answer» B. Sharp corners, pop rivets | |
| 100. |
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» D. All of the above | |
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