2. In Brinell hardness testing the time of loading is
Correct : C. 15 seconds
3. The property of material by which it can be rolled into sheets is called
Correct : D. Malleability
4. Which is amorphous material out of the following?
Correct : E. Glass
5. The greatest amount of strain energy per unit volume that a material can absorb sithout exceeding its elastic limit is
Correct : D. Toughness
6. The fatigue limit of a shaft connot be increased by
Correct : D. Surface decarburisation
7. A composite bar of steel and copper is heated. The copper bar will be under
Correct : A. compression
8. Hot hardness of high speed steels increases due to the addition of
Correct : A. Tungsten
9. Coal used in a cupola is
Correct : E. Coke
10. In cold working of metals
Correct : B. Strength and hardness of steel is increased
11. Number of isotopes for iron is
Correct : C. 4
12. A ductile fracture is usually not preceded by
Correct : C. noise
13. In high speed steel the maximum percentage of any alloying element is
Correct : C. Tungsten
14. Cemented carbide tools are generally not used for the machining of
Correct : D. Brass
15. The structure of common glass is
Correct : A. Amorphous
16. The purpose of annealing is to
Correct : D. Remove stresses
17. The behaviour of visco-elastic materials is
Correct : A. time dependent
18. What is the atomic or ionic characteristic that determines the elements of which the atom or iron is representative?
Correct : D. The number of protons
19. Which of the following increases when copper is hard drawn into wires?
Correct : C. Resistivity
20. The number of elastic constants for a completely anisotropie elastic material which follows Hooke's law is
Correct : B. 21
21. Which of the following materials have maximum magnetic permeability?
Correct : E. Gram oriented Si-Fe
22. Monel metal is
Correct : E. Chromium - Molybdenum alloy
23. Copper sheets are manufactured by
Correct : E. Rolling
24. If steel is quenched in water, the structure obtained is
Correct : A. Martensite
25. Brinell and Vickers hardness values are practically identical upto a hardness of
Correct : A. 300
26. If a material has similar properties throughout its volume, it is said to be
Correct : A. Homogeneous
27. Which of the following material can withstand maximum shocks without failure?
Correct : A. Malleable cast iron
28. Heavy water is obtained by
Correct : E. Prolonged electrolysis of water
29. Identify the incorrect statement
Correct : D. As the roughness of surface increses the fatigue life of speoimen increases
30. Pipes for bicycle frames are made of
Correct : A. Cold rolled steel
31. When a Ge-crystal is doped with phosphorous atom, it becomes
Correct : B. N-type semi-conductor
32. The graphite rods in a nuclear pile
Correct : E. Convert fast moving neutrons into thermal neutrons
33. Bakelite is
Correct : B. uncombustible
34. The material which undergo recoverable deformation and exhibit rubber like elsticity are called
Correct : B. Elastomers
35. Cold worked components are generally subjected to
Correct : A. Annealing
36. Figure of merit is used to
Correct : A. compare the efficiency of chermoelectric materials
37. An elastic behaviour of materials is expressed in terms of
Correct : B. Adiabatic time
38. Metal spinning
Correct : A. Is done on symmetrical articles
39. Trimming is a process associated with
Correct : E. Forging
40. The property by which a body returns to its original shape after the removal to the load is called
Correct : C. Elasticity
41. The phenomenon of weld decay is found in
Correct : E. Stainless steel
42. Which of the following is the major constituent of corundum?
Correct : E. Al2O3
43. Which of the following material has highest specific gravity?
Correct : D. Lead
44. The number of semi-conductors in periodic table is
Correct : D. 13
45. The operation of cutting out flat areas to some desired shape and which is generally the first step in a series of operations is known as
Correct : E. Blanking
46. The material for wire drawing should have
Correct : E. High ductility
47. Which one of the following is usually most ductile?
Correct : C. Face centred cubic lattic
48. The maximum hardenability of any steel depends on
Correct : A. The carbon content
49. In case of biaxial stress system when a member is subjected to tensile stresses in two perpendicular directions the maximum shear stress in case of mild steel occurs on a plane inclined at
Correct : E. 45?
50. Steel may be manufactured by
Correct : B. Open hearth process
51. Electro-forming is particularly vauable for
Correct : E. Thin walled parts requiring a high order of accuracy and internal surface finish
52. Wrought iron is
Correct : B. Easily hardened
53. Which one is different from the remaining
Correct : B. Electroplating
54. All of the following are examples of ceramic materials EXCEPT
Correct : A. Bakelite
55. Process of making a thin phosphate coating on steel to act as a base or primer for enamels and paints in known as
Correct : E. Parkerizing
56. A thermocouple works on which of the following effect?
Correct : B. Seeback effect
57. The highest percentage of carbon that an iron carbon alloy can have is
Correct : E. 6.60%
58. A lead based bearing alloy contains
Correct : D. Lead-antimony-tin-copper
59. The solid solution carbon in alpha iron obtained on cooling of 0.2% carbon steel which have been heated above the third critical point is called
Correct : D. Ferrite
60. Corrosion resistance of steels is increased by the addition of alloying elements like
Correct : C. Cobalt and vanadium
61. Galena is the ore for
Correct : B. Lead
62. Plastic deformation which is carried out in a temperature region and over a time interval such that the strain hardening is not relieved is known as
Correct : B. Cold work
63. Within elastic limits
Correct : C. Deformation is proportional to the load
64. The ability of material to absorb energy when deformed elastically and to return it when unloaded is called
Correct : A. Resilience
65. The variable stress below which the probability of failure of a material is negligible, is called
Correct : B. Tolerance limit
66. In a glass metal seal the two components must match with respect to their
Correct : E. Thermal expansion
67. The phenomenon of materials in which slow extension of materials takes place with the time at constant load is known as
Correct : D. Creep
68. Tensile strength of common varieties of cast iron is in the range
Correct : E. 140 - 500 M Pa
69. Which of the following material has least coefficient of expansion?
Correct : E. Invar
70. Iron alloyed with carbon more than 2% is called
Correct : C. Cast iron
71. A surface damage which results when two surfaces in contact experience light periodic relative motion is
Correct : A. Fretting
72. During induction hardening the depth of hardening is controlled by
Correct : B. Voltage
73. Stress concentration may be caused by
Correct : B. A home or a notch in the body
74. Polystrene at room temperature is
Correct : A. Brittle
75. Small end of a connecting rod forging is
Correct : C. Broached
76. If steel is slowly cooled in furnace, the structure obtained is
Correct : A. Pearlite
77. Machinability of a metal depends on
Correct : D. (A) and (B) above
78. Which is expected to be strongest in tension?
Correct : C. Piano wire
79. When metal is deformed by cold work, severe stresses known as residual stresses are undesirable and to remove them
Correct : C. The metal should be reheated below recrystallization temperature
80. The ability of a tool to resist softening at high temperatures is known as
Correct : B. Red hardness
81. Which of the following is a mesomorphous material?
Correct : C. Mica
82. Electron with energy level of 2 MeV is considered as
Correct : A. Fast electron
83. Shot peening
Correct : D. Improves fatigue life of small parts
84. when atoms are hold together by the sharing of valence electrons
Correct : A. They form a covalent bond
85. When piece of 0.2% carbon steel is heated above third critical point the steel is a solid solution of carbon in gamma iron and called
Correct : B. Austenite
86. The common household glass is
Correct : D. Soda lime glass
87. Silicon doped with phosphorous is an
Correct : D. n-type semi-conductor
88. When a normal atom loses an electron, the atom
Correct : A. Becomes a positive ion
89. Steel pipes are generally manufactured by
Correct : C. Extrusion process
90. Which of the following class of materials are good conductors of heat and electricity?
Correct : E. Metals
91. The ability of a material to absorb energy in the plastic range is known as
Correct : C. Toughness
92. Sorbite' is obtained when
Correct : B. Steel is annealed
93. Selenium is an
Correct : A. intrinsic semi-conductor
94. In ferromagnetic materials
Correct : B. the atomic magnetic moments are parallel
95. Machining properties of steel are improved by adding
Correct : B. Lead
96. In compression, a prism of brittle material will break
Correct : C. By shearing slong oblique plane
97. Monel metal consists of
Correct : B. Aluminium copper and nickel
98. Cadmium sulphide cell is a
Correct : A. Photo conductive cell
99. Which process is different from the others
Correct : A. Drop forging
100. By alloying copper with manganese which of the following increases?