Quiznetik

Material Science | Set 8

1. Dye Penetrant inspection uses

Correct : A. liquid dye

2. Which of the following is true for dye penetrant test

Correct : A. used for any material

3. Internal Defects can be detected by Dye Penetrant Test

Correct : B. never

4. Dye Penetrant penetrates inside the crack by

Correct : C. capillarity

5. Penetrant comes out of the cracks by

Correct : A. surface tension

6. Developer is poured........ The penetrant

Correct : B. after

7. Liquid Penetrant Test is based on the Principle of

Correct : B. capillarity

8. DPT cannot be used for

Correct : D. can be used for all

9. Cleaning of surface is important in DPT

Correct : A. required

10. DPT is suitable for

Correct : A. rolled products

11. For Visual Inspection

Correct : A. lower magnificati o n is used

12. Which of the following is not NDT

Correct : D. vicker\s hardness test

13. Specimen can be reused after the NDT

Correct : D. can\t say

14. Which of the following tests is a NDT

Correct : D. visual inspection

15. Advantages of Non destructive Testings are

Correct : D. all of the above

16. Which of the following method uses the principle of SONAR

Correct : B. ultrasonic testing

17. Which of the following method is used for finding the internal defects of material?

Correct : A. ultrasonic testing

18. Which factor of ultrasonic waves is measured in Ultrasonic Testing?

Correct : C. time of travel

19. Which of the following method uses two transducers?

Correct : B. through transmission

20. Time of travel of waves from the defect is…… for Pulse Echo method

Correct : B. less

21. Internal Discontinuities in the shaft for elctric motor can be checked by

Correct : A. ultrasonic testing

22. Select odd options :- Couplant is used in Ultrasonic Testing to

Correct : B. clean the surface

23. select odd options :- Magnetic partical test is not suitable for

Correct : C. aluminium

24. select odd options :- Magnetic partical test is not suitable for

Correct : B. powder metallurgy

25. ferromagnetic powder suspended on surface with carrier such as

Correct : C. keroscene

26. In MPT, when the part is magnetised                       , transverse cracks are easily detected

Correct : A. lengthwise

27. To find out the transverse crack,                        magnetic field has to apply, in MPT

Correct : B. circular

28. In MPT, skin effect comes into picture due to                current

Correct : A. ac

29. current magnetization makes it possible to detect surface as well as subsurface discontinuities.

Correct : B. dc

30. In MPT, detection of subsurfae depends on

Correct : B. width of discontinuity

31. Detection of subsurfae depends on                    , in MPT

Correct : A. the strength of magnetic field

32. In magnaglo, the wavelength of ultraviolet light is

Correct : B. 3500 to 4000a °

33. ...........does not damage the workpiece.

Correct : D. none

34. ...........test does not damage the workpiece while testing

Correct : A. magnaflu

35. The defects like mould shifts,surface roughness,blow holes etc can be easily detected by ......... method.

Correct : B. visual inspection

36. ...........is commonly used for visual inspection method

Correct : B. optical microscope

37. ........is used to inspect the inside portion of a hollow chamber,narrow tube or a bore

Correct : A. boroscope

38. Oil couplant used in the ultrasonic test to

Correct : B. avoid air gap

39. Which type of the test is mostly used for the inspection of the grinding and fatigue cracks on tool steeel?

Correct : A. magnaflux

40. Dimension and accuracy in the products may be checked by

Correct : D. eddy current

41. Level of liquid in the sealed container may be checked by

Correct : C. radiography

42. Internal defects inthe steel component cannot be detected by

Correct : A. magnaflux

43. Which one may be used as material for transducer in ultrasonic test?

Correct : B. quartz

44. Eddy current test may be used to find out

Correct : D. all of the above

45. Principle of operation of eddy current test is based on the

Correct : A. development of emf

46. Which one is not a part of magnaflux process?

Correct : D. observation under microscope

47. The horizontal cracks sre detected in magnaflux test by

Correct : A. circular magnetizatio n

48. The circular cracks are detected in magnaflux test by

Correct : B. longitudinal magnetizatio n

49. The purpose of developer is to make the penetrant

Correct : B. in the crack visible

50. If the care is not taken during magnaflux test then. .... is possible

Correct : A. local heating and sparking

51. Response of eddy current is depends upon

Correct : D. all of the above

52. The result can be recorded by permanently in

Correct : D. radiography

53. The crack depth measurement is possible in

Correct : D. both b and c

54. Measurement of the electric cunductivity of silver plated electrical contact is possible by

Correct : B. eddy current test

55. Quartz is used in NDT

Correct : A. ultrasonic

56. Flouroscent is used in NDT

Correct : D. dye penetrant and magnaflu x

57. Electric current is not used in NDT

Correct : D. dye penetrant

58. AC is used in magnaflux test to detect

Correct : A. surface defect

59. DC is used in magnaflux test to detect

Correct : D. sub surface

60. X-rays are produced by stricking

Correct : B. electrons against anode

61. Radioactive decay of radium and salt will cause generation of

Correct : C. gamma rays

62. destruction of metal through unwanted or unintentional chemical or electrochemical reaction is known as

Correct : B. corrosion

63. the corrosion which occurs due to chemical reaction between metal and atmospheric gases is known as

Correct : C. both a and b

64. the extent of dry corrosion depends on

Correct : C. both a and b

65. in case of dry corroison if the protective film formed is porous

Correct : A. it gives good protection

66. in conducting corrosion the intensity of corrosion depends on

Correct : A. electronic and ionic conductivitie s of the film

67. the common example of direct corrosion is

Correct : D. all of the above

68. the type of corrosion which takes place due to electrochemical reaction is known as

Correct : B. wet corroison

69. wet corroison occurs under                 conditions

Correct : D. all of the above

70. in corrosion at cathodic area

Correct : D. all of the above

71. electrode potential of metal depends upon

Correct : D. all of the above

72. in corroison at anodic area

Correct : D. all of the above

73. more negative electrode potential of metal indicates

Correct : A. higher probability of corrosion

74. dissolution of metal as corressponding metal ions with liberatoin of electrons is known as

Correct : D. both a and c

75. M --> M+ + e- is chemical reaction which is

Correct : D. both a and c

76. usually in acidic environments like industrial watse, solution of non-oxidising acids the corrosion take place by

Correct : A. hydrogen evolution

77. Fe + 2H+ = Fe+2 + H2 is chemical reaction in

Correct : A. hydrogen evolution

78. all metal above hydrogen in electrochemical series will have tendency to get corroded by

Correct : A. hydrogen evolution

79. in hydrogen evolution mechanism of corroison

Correct : B. anode usually have large areas than cathode

80. when electrolyte is neutral acqueous solution or alkaline solution, the type of corrosion takes place is known as

Correct : B. oxyfen absorption

81. due to formation of pinholes, pits and cavities in the metal, the type of corrosion which takes place is known as

Correct : B. pitting corrosion

82. formation of small anodic and large cathodic areas is a charatcristics of

Correct : B. pitting corrosion

83. due to brakege of protective film the type of corrosion which takes palce is known as

Correct : B. pitting corrosion

84. pitting corrosion can occur under the following conditions

Correct : D. all of the above

85. the type of corrosion occurs in granular metals and in homogeneous alloys is known as

Correct : C. intergranular corrosion

86. intergranular corroison occurs

Correct : A. along the garin boundaries

87. due to difference in electrode potential at grain and grain boundaries the type of corrosion which take place is known as               -

Correct : C. intergranular corrosion

88. stainless steels are preone to

Correct : C. intergranular corrosion

89. residual stresses in materis leads to

Correct : A. stress corrosion cracking

90. due to non uniform and rapid cooling, welding, poor design, precipitation of second phase material leads to

Correct : B. stress corrosion cracking

91. stress corrosion cracking can be reduced by

Correct : A. eleminating the internal stresses with the help of heat treatment like stress- relief annealing or full annealing

92. In Cu alloys season cracking is a type of

Correct : B. stress corrosion cracking

93. H2O + (1/2) O2 + 2e-1 --> 2OH- (Reduction) is reaction taking plcae at               ---

Correct : A. cathode

94. in dissolved oxygen content of electrolyte has              effect on corrosion reaction

Correct : C. both are true sentenses

95. in oxygen absorption reaction mechnism os corroison

Correct : A. cathode usually have large areas than anode

96. scratches, local straining of metal due to non- uniform stresses, sliding uncer load leads to

Correct : A. pitting corrosion

97. out of the following sentences which sentence is not true for pitting corrosion ?

Correct : D. none uniform heat treatment

98. in intergranular corrosion

Correct : D. both a and c

99. in stainless steel the precipitation of Cr carbides leads to

Correct : B. stress corrosion cracking

100. sensitized stainless steel are

Correct : A. prone to corroiosn