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