Quiznetik

Metallurgy | Set 1

1. Heating elements of electrical heaters are made of

Correct : A. Nichrome

2. Which of the following element does not impart hardness to steel?

Correct : A. Copper

3. The property which enables metals to be drawn into wire is known as

Correct : B. Ductility

4. Endentor used in Vickers hardness testing machine is

Correct : A. Diamond square-based pyramid

5. When steel is made from phosphatic iron, it is likely to be

Correct : C. Brittle

6. Compressive strength is highest in case of

Correct : C. High carbon steel

7. In nodular iron, graphite is present in the form of

Correct : D. Spheroids

8. Which hardening process is generally not used for steels?

Correct : A. Age hardening

9. The flux used in brazing is usually

Correct : C. Borax

10. The electrical conductivity of ferrites is

Correct : E. Less than that of ferromagnetic materials

11. For normalizing, steel is heated to

Correct : B. 30?C to 60?C above critical temperature

12. Steel recommended for induction hardening should have

Correct : B. Fine grains

13. Major constituent of phosphor bronze is

Correct : B. Copper

14. Which of the following material is used for permanent magnets?

Correct : E. Alnico

15. If the steel at room temperature is magnetic, the presence of which constituent can be ruled out?

Correct : C. Austenite

16. Which of the following is usually made of high carbon steel?

Correct : C. Hammers

17. Nodular iron has low

Correct : A. Melting point

18. In order to improve machinability of stainless steels

Correct : D. (A) and (B) above

19. The unit of diffusion coefficient is

Correct : E. metre-2 second-1

20. The upper range of mercury thermometer can be increased by

Correct : A. Filling the stem with nitrogen under pressure

21. The depth of hardening is affected by

Correct : D. All of the above

22. Monochromatic X-rays reflected from a calcite crystal (lattice constant ? = 3? ) give rise to first order Bragg reflection at 6.7?. The wavelength of these X-rays will be

Correct : D. 0.7 A

23. During hardening soft spots can be avoided by

Correct : D. Any of the above

24. Which of the following is high speed steel?

Correct : D. T 75 W 18 Co 6 Cr 4 V 1 Mo 75

25. Percentage of iron in pig iron approximately

Correct : C. 90%

26. Silicon when added to copper increases its

Correct : D. Hardness

27. Local hardening of steel can be done by all of the following EXCEPT

Correct : A. flame hardening

28. Which of the following structure is least hard?

Correct : A. Pearlite

29. Highest specific gravity is of

Correct : C. Lead

30. In which process steel is heated below the critical temperature

Correct : A. Temperting

31. Under identical values of cold and hot junction temperatures which thermocouple given the highest output

Correct : D. Chromel-constantan

32. In tool steel the sulphur content is usually not allowed to exceed

Correct : B. 0.035 percent

33. Which of the following material is not used for cyaniding?

Correct : C. Sodium hydroxide

34. The number of atoms per unit cell in BCC is

Correct : B. 9

35. As per IS code, C 65 steel will have carbon percentage of

Correct : B. 0.6 to 0.7 percent

36. Invar is an alloy of

Correct : B. Iron and nickel

37. Which of the following can be used as fuel in open hearth furnace?

Correct : D. Any of the above

38. Which of the following furnaces is not used for non-ferrous materials

Correct : C. Cupola

39. In order to observe the grain size of steel samples under microscope, the magnification should be the order of

Correct : D. 100

40. For each ton of pig iron produced from blast furnace, the lime stone used is approximately

Correct : B. 0.4 tom

41. Chilling, heat treatment and alloy addition to cast iron generally

Correct : A. reduces machinability

42. Manganese is added to steel primarily to increase

Correct : E. Tensile strength

43. Just as strong is opposite of weak likewise elastic is opposite of

Correct : A. Rigid

44. Which of the following temperatures represents the tempering temperature for C 30 steel?

Correct : C. 1400-1450?C

45. Which thermocouple can measure the highest temperature?

Correct : A. Tungsten- molybdenum

46. Which of the following is the softest material?

Correct : E. Calcite

47. Which allotropic form of iron does not have body centred cubic lattice?

Correct : C. Gamma iron

48. All of the following are magnetic materials EXCEPT

Correct : B. Zinc

49. Machinability of metal depends on

Correct : B. Hardness and tensile strength

50. Which of the following is not a constituent of Stellite?

Correct : C. Ferrous

51. Which of the following metal has face centred cubic structure?

Correct : B. Gold

52. Which colour of flame represents the highest temperature?

Correct : C. White

53. Which of the following metal does not have face centred cubic structure?

Correct : B. Tin

54. The rollers of a cycle chain are subjected to

Correct : D. Fatigue stress

55. The maximum temperature inside a blast furnace gas is of the order of

Correct : C. 1600?C

56. If an article develops insufficient hardening after quenching it could be due to any of the following EXCEPT

Correct : A. Internal stresses in the article before heating

57. Which of the following is the hardest?

Correct : D. Corundum

58. The allotropic form of iron not having body centred cubic lattice is

Correct : D. Delta iron

59. Dilute nitric acid applied to a clean fracture of wrought iron gives

Correct : C. White stain

60. Railway rails are made of

Correct : E. High carbon steel

61. High ductility wires are made on

Correct : D. Dead mild steel

62. The highest percentage of chrommium that can be added to steel is usually

Correct : A. 18 percent

63. Eutectoid steel has a structure of

Correct : D. Nickel

64. The flux used in blast furnace while melting iron ore is

Correct : E. Lime stone

65. Galvanising layer usually provides protection in the range of water

Correct : E. 6 to 11

66. Ferrite is

Correct : C. Soft and ductile

67. If a sample of steel shows unsymmetrical deformation of a piece in quenching, the probable cause could be

Correct : D. Non-uniform heating or cooling

68. Attack of steel is increased by

Correct : E. All of the above

69. Which allotropic form of iron is magnetic at room temperature?

Correct : A. Alpha iron

70. Persence of lead in brass improves

Correct : E. Machining properties

71. Which of the following is a noble metal?

Correct : E. Platinum

72. Which of the following form of iron is produced as a result of annealing of white cast iron?

Correct : D. Malleable iron

73. Which colour of heat represents the highest temperature?

Correct : B. White

74. Nickel is

Correct : A. Ferromagnetic

75. The tensile strength of nodular iron may be of the order of

Correct : E. 4000 kg/cm2

76. During heat treatment, deformation and volume changes can be minimised by

Correct : D. Any of the above

77. Spherical metal powders are usually produced by

Correct : D. Automization

78. In Brinell hardness testing the timer for loading is

Correct : A. 15 seconds

79. The stainless steels owe their resistance to corrosion to the presence of

Correct : A. Chromium

80. The effect of austenitic grain size development during heat treatment is

Correct : B. greater toughness

81. Warping may be avoided when quenching a long slender piece of work by

Correct : B. Hoding the work piece vertically over the quenching bath and plunging it straight

82. Which of the following is not a hardening process?

Correct : D. Sphcroidizing

83. The maximum percentage of carbon in austenite is

Correct : C. 1.70%

84. Nichrome contains

Correct : C. Nickel and chromium

85. Free cutting steels usually have sulphur content of

Correct : B. 0.21 percent

86. Fusible plug for boilers consists of

Correct : D. Bismuth, lead and tin

87. Stellite contains

Correct : C. Cobalt, chromium and tungsten

88. For producing cast iron pipes by centrifugal casting method the core used is

Correct : E. No core is used

89. Mild steel has the structure of

Correct : A. BCC

90. Which of the following furnace is used to convert liquid pig iron into steel?

Correct : C. Converter

91. Lowest melting point may be expected for

Correct : B. Lead

92. Which of the following is easiest to bend?

Correct : B. Wrought iron

93. Dilute nitric acid applied to a clean fracture of white cast iron will produce

Correct : E. Brown stain

94. Plasticisers are added to plastic compounds to

Correct : E. Improve softness and flexibility

95. The process of providing zinc coating on steel pipes is known as

Correct : C. Galvanising

96. Th phenomenon of emf development between two diferent metals placed in contact is known as

Correct : C. Seeback effect

97. Hardening by carburizing is limited to

Correct : A. 2 mm

98. Which of the following is by product from blast furnace?

Correct : D. All of the above

99. Which of the following is not true in case of white cast iron

Correct : C. It is malleable

100. Which iron ore has least percentage of iron

Correct : D. Siderite