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1. |
The ability of material to absorb a large amount of energy is |
A. | Malleability |
B. | Resilience |
C. | Toughness |
D. | Ductility |
E. | Hardness |
Answer» C. Toughness |
2. |
Porous materials generally |
A. | Transmit sound |
B. | Isentropic material |
C. | Absorb most of the sound |
D. | Reflect entire sound |
Answer» C. Absorb most of the sound |
3. |
A body which does not contain voids or empty spaces is known as |
A. | Continuous body |
B. | An isotropic body |
C. | Heterogeneous body |
D. | Crystalline body |
E. | None of the above |
Answer» A. Continuous body |
4. |
Standards used in USSR are known as |
A. | CSN |
B. | AENOR |
C. | GOST |
D. | UNI |
E. | JIS |
Answer» C. GOST |
5. |
A non-crystalline polymer which can be stretched to more than twice its original length and which contracts quickly on releasing the load, is known as |
A. | copolymer |
B. | dilatant |
C. | plastic |
D. | elastomer |
E. | None of the above |
Answer» D. elastomer |
6. |
For better fuuidity of the molten metal, the following is added in blast furnace |
A. | Line |
B. | Carbon |
C. | Sulphur |
D. | Manganese |
E. | Oil |
Answer» D. Manganese |
7. |
Lead is used for joining pipes made of |
A. | Cast iron |
B. | Cold iron steel |
C. | Concrete |
D. | Asbestos cement |
E. | Vitrified clay |
Answer» A. Cast iron |
8. |
Laser is a device to produce |
A. | Beam of white light |
B. | Beam of monochromatic light |
C. | Coherent light |
D. | X-rays |
E. | Microwaves |
Answer» C. Coherent light |
9. |
Which of the following has the highest malleability? |
A. | Brass |
B. | Cast iron |
C. | Copper |
D. | Aluminium |
E. | Lead |
Answer» E. Lead |
10. |
Notches in a section produce |
A. | Compressive stress |
B. | Shear stresses |
C. | Biaxial tensile stresses |
D. | Tri-axial tensile stresses |
E. | None of the above |
Answer» D. Tri-axial tensile stresses |
11. |
In induction hardening |
A. | Only d.c. supply is used |
B. | The power factor is high |
C. | The voltage is high |
D. | The frequency is high |
E. | The current is high |
Answer» D. The frequency is high |
12. |
Burger's vector is |
A. | estimation of force9 of substit9utional atoms |
B. | a defect in crystall structure |
C. | a property of dislocations |
D. | None of the above |
E. | None of the above |
Answer» C. a property of dislocations |
13. |
German silver is an alloy of |
A. | Silver, gold and platinum |
B. | Silver, copper and niclel |
C. | Nickel, copper and zinc |
D. | Silver with impurities below 1% |
E. | Silver, copper and lead |
Answer» C. Nickel, copper and zinc |
14. |
The atomic number of a certain element is 83. An atom of this element must contain |
A. | 42 protons and 41 electrons |
B. | 83 neutrous |
C. | 1 neutron, 41 electrons and 41 protons |
D. | 83 electrons |
E. | None of the above is valid |
Answer» D. 83 electrons |
15. |
The electrical resistance of a semi-conductor |
A. | Increases with temperature |
B. | Decreases with temperature |
C. | Does not change with temperature |
E. | None of the above |
Answer» B. Decreases with temperature |
16. |
Coolant is used on a lathe |
A. | To cool the work piece |
B. | To cool the tool |
C. | To remove the chips |
D. | All the above |
E. | None of the above |
Answer» D. All the above |
17. |
Which one is different from the other in press work? |
A. | Perforating |
B. | Slitting |
C. | Blanking |
D. | Seaming |
E. | Punching |
Answer» D. Seaming |
18. |
Hard steels and non-ferrous metal do not exhibit a definite yield point when pulled in the testing machine and for such cases a better measure of their elastic properties is defined by |
A. | Yield point stress |
B. | Yield point strain |
C. | Proof stress |
D. | Ultimate stress |
E. | None of the above |
Answer» C. Proof stress |
19. |
If the major quantium number of an atom is three, it possesses |
A. | Only s and p electrons |
B. | Only s electrons |
C. | Only s, p and d electrons |
D. | Only p electrons |
E. | None of the above is true |
Answer» C. Only s, p and d electrons |
20. |
In an one component system containing two phases, at equilibrium the number of degrees of freedom would be |
A. | Infinite |
B. | 2 |
C. | 3 |
D. | 1 |
E. | 4 |
Answer» D. 1 |
21. |
The furnace used for castings of cast iron in a foundry shop is known as |
A. | Electric induction furnace |
B. | Muffle furnace |
C. | Blast furnace |
D. | Cupola |
E. | Reverberatory furnace |
Answer» D. Cupola |
22. |
In fibre glass reinforced plastics, the glass fibres are primarily used to improve |
A. | Mechanical properties of plastics |
B. | Electrical properties of plastics |
C. | Thermal properties of plastics |
D. | Surface properties of plastics |
E. | None of the above |
Answer» A. Mechanical properties of plastics |
23. |
Application of tin is in |
A. | bulb filaments |
B. | low current fuses |
C. | transducers |
D. | hair springs |
E. | None of the above |
Answer» B. low current fuses |
24. |
The phenomenon of 'weld decay' is associated with |
A. | Stainless steels |
B. | Manganese steels |
C. | Aluminium alloys |
D. | Cast iron |
E. | Brass |
Answer» A. Stainless steels |
25. |
German silver contains |
A. | 5% silver |
B. | 1% silver |
C. | 10% silver |
D. | No silver |
E. | 0.1% silver |
Answer» A. 5% silver |
26. |
Which of the following is a composite material? |
A. | Y-alloy |
B. | High speed steel |
C. | Tungsten carbide |
D. | Fibre reinforced plastic |
E. | None of the above |
Answer» D. Fibre reinforced plastic |
27. |
A material which undergoes no deformation till its yield point is reached and then it flows at a constant stress is known as |
A. | Rigid plastic |
B. | Elastic |
C. | Rigid |
D. | Plastic |
E. | Elastic-plastic |
Answer» A. Rigid plastic |
28. |
In carbon steel castings |
A. | The percentage of carbon is less than 1.7% |
B. | The percentage of carbon is between 1.7% to 2% |
C. | The percentage for alloying elements is controlled |
D. | (A) and (C) above |
E. | (B) and (C) above |
Answer» A. The percentage of carbon is less than 1.7% |
29. |
Nickel is used in |
A. | cutting tools |
B. | automatic voltage regulators |
C. | electrodes of thermionic valves |
D. | pressure sensitive elements |
E. | None of the above |
Answer» C. electrodes of thermionic valves |
30. |
In order to improve machinability of steels, the treatment generally done is |
A. | Cyniding |
B. | Tempering |
C. | Spheroidising |
D. | Annealing |
E. | Normalising |
Answer» D. Annealing |
31. |
Induction hardening is the process of |
A. | Electrical hardening process |
B. | Hardening surface for wear resistance |
C. | Hardening the core |
D. | Selective hardening |
E. | Uniform hardening |
Answer» B. Hardening surface for wear resistance |
32. |
"Troosite" is obtained when |
A. | Quenching steel during transformation |
B. | A fully hardened steel is finally drawn at about 677?C |
C. | Steel is rapidly quenched in oil |
D. | When alloy steels are rapidly quenched in water |
E. | None of the above |
Answer» A. Quenching steel during transformation |
33. |
The semi-conductors have electrical conductivities of the following order (ohm-cm-1) |
A. | 10?20 |
B. | 10?15 |
C. | 10?3 |
E. | None of the above |
Answer» C. 10?3 |
34. |
Cast iron containing 6.6% carbon is |
A. | Black in colour containing only pearlite |
B. | Black in colour containing only ferrite |
C. | Gray in colour containing pearite and ferrite only |
D. | Whitish containing cementite only |
E. | None of the above |
Answer» D. Whitish containing cementite only |
35. |
The main alloy for corrosion resistance in stainless steel is |
A. | Manganese |
B. | Carbon |
C. | Vanadium |
D. | Cobalt |
E. | Chromium |
Answer» E. Chromium |
36. |
A steel having ferrite and pearite is |
A. | Soft |
B. | Hard |
C. | Ductile |
D. | (A) and (B) above |
E. | (A) and (C) above |
Answer» A. Soft |
37. |
Which variety of copper has the best mechanical strength? |
A. | Annealed copper |
B. | Hard drawn copper |
C. | Cast copper |
D. | Soft copper |
E. | None of the above |
Answer» B. Hard drawn copper |
38. |
Brinell hardness number for nitrided steel is in the range |
A. | 60 to 80 |
B. | 100 to 150 |
C. | 300 to 450 |
D. | 700 to 800 |
E. | 200 to 300 |
Answer» D. 700 to 800 |
39. |
Diamagnetic materials are |
A. | Only slightly magnetised |
B. | Strongly magnetised |
C. | Magnetised with eddy currents only |
D. | Magnetised in a direction opposite to that of the applied field |
E. | None of the above |
Answer» B. Strongly magnetised |
40. |
Gamma iron has |
A. | Body centred space lattice structure containing 6 atoms |
B. | Body centred space lattice structure containing 10 atoms |
C. | Face centred space lattice structure with 8 atoms |
D. | Face centred space lattice structure with 14 atoms |
E. | None of the above |
Answer» D. Face centred space lattice structure with 14 atoms |
41. |
Silicon steel is widely used in |
A. | Chemical industry |
B. | For cutting tools |
C. | Electrical industry |
D. | For making leaf prings |
E. | For nuts and bolts |
Answer» C. Electrical industry |
42. |
Moh's scale of hardness has the range |
A. | 10--15 |
B. | 1--5 |
C. | 1--3 |
D. | 1--10 |
E. | 5--10 |
Answer» D. 1--10 |
43. |
The tendency for brittle fracture increases with |
A. | Increasing temperature |
B. | Decreasing strain rate |
C. | Appreciable plastic deformation before fracture |
D. | Appreciable plastic deformation during propagation of the crack |
E. | None of the above |
Answer» E. None of the above |
44. |
Preheating of material to be welded is necessary in case of |
A. | Non-ferrous materials |
B. | Cast iron |
C. | Stainless steel |
D. | Carbon steel |
E. | High speed steel |
Answer» B. Cast iron |
45. |
Steel balls for ball bearings are generally made of |
A. | Carbon chrome steel |
B. | Stainless steel |
C. | Cast steel |
D. | Nodular cast iron |
E. | Free carbon steel |
Answer» A. Carbon chrome steel |
46. |
The process of reheating the hardened steel to some temperature below the critical range, followed by any rate of cooling is known as |
A. | Spheroidising |
B. | Normalising |
C. | Tempering |
D. | Annealing |
E. | Austempering |
Answer» C. Tempering |
47. |
Delta iron occurs at temperature in the range of |
A. | Room temperature to 600?C |
B. | 600?C to critical temperature |
C. | Between 800?C and 1200?C |
D. | Between 1400?C and 1530?C |
E. | None of the above |
Answer» D. Between 1400?C and 1530?C |
48. |
Which process is used primarily to obtain surface finish |
A. | Swaging |
B. | Electroforming |
C. | Shining |
D. | Broaching |
E. | Parkerizing |
Answer» E. Parkerizing |
49. |
In normalising steel is heated 40-50 C |
A. | Above the upper transformation range |
B. | Above the lower transformation range |
C. | Below the lower transformation range |
D. | Above room temperature |
E. | Below the upper transformation range |
Answer» A. Above the upper transformation range |
50. |
Which of the following metals has high tendency to get work hardened? |
A. | Lead |
B. | Silver |
C. | Brass |
D. | Aluminium |
E. | Copper |
Answer» C. Brass |
51. |
The property of materials by which they can be drawn into wires is known as |
A. | Creep |
B. | Malleability |
C. | Elasticity |
D. | Plasticity |
E. | Ductility |
Answer» E. Ductility |
52. |
The strength of timber is |
A. | less along the grains more across the grains |
B. | more along the grains less across the grains |
C. | same in all directions |
D. | maximum in a direction at 45? to the longitudinal axis |
E. | None of the above |
Answer» B. more along the grains less across the grains |
53. |
Permalloy is |
A. | An nickel and iron alloy having high permeability |
B. | An alloy similar to carbides |
C. | A non-ferrous alloy containing nickel copper and chromium |
D. | A kind of stainless steel |
E. | A non-ferrous alloy used in aircraft industry |
Answer» C. A non-ferrous alloy containing nickel copper and chromium |
54. |
Visco-elastic behaviour is common in |
A. | Crystalline materials |
B. | Non-crystalline solids |
C. | Plastics |
D. | Rubber |
E. | Non-crystalline organic polymers |
Answer» A. Crystalline materials |
55. |
The hardness of steel depends on |
A. | Heating temperature before quenching |
B. | The shape and distribution of carbides in iron |
C. | Amount of carbon it contains |
D. | Basic process from which it is produced |
E. | Percentage of alloying elements |
Answer» B. The shape and distribution of carbides in iron |
56. |
When a current is passed through the junction of two different metals, heat is absorbed or liberated depending on the direction of the current. The above phenomenon is known as |
A. | Kelvin effect |
B. | Joule's effect |
C. | Peltier's effect |
D. | None of the above |
E. | None of the above |
Answer» C. Peltier's effect |
57. |
Hastalloy consists of |
A. | Copper and aluminium |
B. | Nickel and molybdenum |
C. | Aluminium and nickel |
D. | Nickel and copper |
E. | Nickel, copper and aluminium |
Answer» B. Nickel and molybdenum |
58. |
Which of the following hardness tester can be used to determine the hardness of a glass sheet? |
A. | Brinell hardness tester |
B. | Vickers hardness tester |
C. | Rockwell hardness tester |
D. | Shore scleroscope |
E. | None of the above |
Answer» D. Shore scleroscope |
59. |
A material is known as allotropic or polymoriphic if it |
A. | Has its atoms distributed in random pattern |
B. | Responds to heat tretment |
C. | Has a fixed structure under all conditions |
D. | Exists in several crystal forms at different temperatures |
E. | Can be cast |
Answer» C. Has a fixed structure under all conditions |
60. |
A piezo electric is |
A. | a material which become polarised when stressed |
B. | a material which changes dimension due to applied field |
C. | a material that never gets polarised |
D. | a material in which magnetising force reduces when current flowing is increased |
E. | None of the above |
Answer» A. a material which become polarised when stressed |
61. |
A material with unequal anti-parallel atomic magnetic moments is |
A. | an anti-ferromagnetic |
B. | ferrimagnetic |
C. | ferrite |
D. | non-magnetic |
E. | None of the above |
Answer» A. an anti-ferromagnetic |
62. |
Boring is generally |
A. | Followed by reaming |
B. | Preceded by reaming |
C. | Followed by drilling |
D. | Preceded by drilling |
E. | None of the above |
Answer» D. Preceded by drilling |
63. |
Ferromagnetic alpha iron change to paramagnetic alpha iron at |
A. | 1500?C |
B. | 910?C |
C. | 77?C |
D. | 1400?C |
E. | 1650?C |
Answer» C. 77?C |
64. |
If a body has identical properties all over it is known as |
A. | Ductile |
B. | Isentropic |
C. | Plastic |
D. | Elastic |
E. | Homogeneous |
Answer» E. Homogeneous |
65. |
The technique of converting metallic powders into articles of definite form is known as |
A. | High pressure pressing |
B. | Carbiding |
C. | Powder metallurgy |
D. | Plasticizing |
E. | None of the above |
Answer» C. Powder metallurgy |
66. |
In Brinell hardness testing, while determining hardness of aluminium |
A. | Indenting ball of smaller diameter is used |
B. | Time of loading is reduced |
C. | Load on the indenter is reduced |
D. | Plastic |
Answer» C. Load on the indenter is reduced |
67. |
In flame hardening the flame used is |
A. | Oil burner |
B. | A wick stove |
C. | Oxygene air |
D. | Gas burner |
E. | Oxy-acetylene |
Answer» E. Oxy-acetylene |
68. |
Viscoelastic materials show behaviour which is |
A. | Elastic |
B. | Inelastic |
C. | Independent of time |
D. | Plastic |
E. | Time dependent |
Answer» E. Time dependent |
69. |
Age hardening is generally applicable to |
A. | Alloys of aluminium, magnesium, nickel etc |
B. | High alloy steels |
C. | Cast iron |
D. | Alloys of chromium, vanadium etc |
E. | Medium carbon steels |
Answer» A. Alloys of aluminium, magnesium, nickel etc |
70. |
Inconel is an alloy containing |
A. | Nickel, zinc and iron |
B. | Copper nickel and chromium |
C. | Nickel, chromium and iron |
D. | Nickel, copper and iron |
E. | Copper, nickel and cobalt |
Answer» A. Nickel, zinc and iron |
71. |
Just as strong is opposite to weak, similarly brittle is opposite to |
A. | Tough |
B. | Rigid |
C. | Elastic |
D. | Soft |
E. | Hard |
Answer» A. Tough |
72. |
Gel is |
A. | a polymer having side groups distributed randomly along a vinyl polymer chain |
B. | a polymer having secondary chains branching from the main molecular chains |
C. | A solid frme work of colloidal particles linked together and containing a fluid in its interstices |
D. | a polymer in which the repeating unit of each moleule has viny group |
E. | None of the above |
Answer» C. A solid frme work of colloidal particles linked together and containing a fluid in its interstices |
73. |
Aluminium alloys for pressure die casting |
A. | Must possess considerable fluidity |
B. | Must not be free from hot shortness |
C. | Must have iron as one of the constituents |
D. | Must be light |
E. | None of the above |
Answer» A. Must possess considerable fluidity |
74. |
Carburizing is done |
A. | By heating 200?C below critical temperature |
B. | On steels with carbon percentage of 0.5% |
C. | To induce soft surface for machining on a hard core |
D. | To improve hardenability of steel |
E. | On steel with carbon percentage of 0.7% |
Answer» B. On steels with carbon percentage of 0.5% |
75. |
The amount of cold work that a metal will stand is dependent upon |
A. | Room temperature |
B. | Carbon percentage |
C. | Ductility |
D. | Purity of metal |
E. | Process |
Answer» C. Ductility |
76. |
Solder is an alloy consisting of |
A. | Copper and aluminium |
B. | Lead and copper |
C. | Tin and lead |
D. | Tin, antimony and copper |
E. | Tin and copper |
Answer» C. Tin and lead |
77. |
Which of the following material can be used for the filaments in incandescent lamps? |
A. | Carbon |
B. | Tungsten |
C. | Tantalum |
D. | Any of the above |
E. | None of the above |
Answer» B. Tungsten |
78. |
As per ISS : designation T 70 W 18 4V 1 is |
A. | Stainless steel |
B. | Low carbon steels |
C. | High speed steel |
D. | Soft |
E. | Silicon steel |
Answer» C. High speed steel |
79. |
Which of the following is not the characteristic property of aluminium? |
A. | Good electrical conductivity |
B. | Lightness |
C. | Lest affinity for oxygen |
D. | Resistance to corrosion |
E. | High thermal conductivity |
Answer» C. Lest affinity for oxygen |
80. |
In 18-4-1 high speed steel the maximum percentage of any constituent is |
A. | Iron |
B. | Chromium |
C. | Tungsten |
D. | Carbon |
E. | Vanadium |
Answer» A. Iron |
81. |
Wrought iron is |
A. | Least resistant to corrosion |
B. | Heat treated to change its properties |
C. | Soft |
D. | Highly resistant to corrosion |
E. | Hard |
Answer» D. Highly resistant to corrosion |
82. |
Machining properties of brass can be improved by the addition of |
A. | Carbon |
B. | Lead |
C. | Zinc |
D. | Chromium |
E. | Aluminium Copper alloy |
Answer» B. Lead |
83. |
Silicon steel is widely used in |
A. | Automobile industry |
B. | Electrical industry |
C. | RCC work |
D. | Channel and other section for structural fabrication |
E. | All of the above |
Answer» B. Electrical industry |
84. |
The process by which steel is coated by a thin layer of phosphate is known as |
A. | Anodising |
B. | Phosphorizing |
C. | Spheroidizing |
D. | Parkerising |
E. | Sheradising |
Answer» D. Parkerising |
85. |
Creep is expressed in terms of |
A. | cm/cm2/hr |
B. | cm/cm |
C. | kg/cm2 |
D. | cm/cm/hr |
E. | kg/cm |
Answer» D. cm/cm/hr |
86. |
According to Hooke's law |
A. | Stress is proportional to strain |
B. | Stress/strain is constant |
C. | Average stress is proportional to average strain |
D. | Within elastic limits average stress is proportional to average strain |
E. | None of the above |
Answer» D. Within elastic limits average stress is proportional to average strain |
87. |
Which one is different from the others in press work operations? |
A. | Riveting |
B. | Sizing |
C. | Coining |
D. | Flattening |
E. | Punching |
Answer» E. Punching |
88. |
The advantage of electroforming is |
A. | Extreme dimensional accuracy can be held on surfaces with surface finish of 8 r.m.s. or even less |
B. | Laminated metals can be produced |
C. | Rate of production is very high |
D. | (A) and (B) above |
E. | (A) and (C) above |
Answer» D. (A) and (B) above |
89. |
The size of coarse grams in metals is |
A. | > 0.0005 mm |
B. | >1 mm |
C. | > 0.05 mm |
D. | > 0.005 mm |
E. | > 0.5 mm |
Answer» C. > 0.05 mm |
90. |
A ductile fracture is characterized by |
A. | Rapid rate for crack propagation |
B. | Negligible deformation |
C. | Fragmentation into more than two pieces |
D. | Appreciable plastic deformation prior to propagation of crack |
E. | None of the above |
Answer» D. Appreciable plastic deformation prior to propagation of crack |
91. |
Which of the following is not a rare and precious metal? |
A. | Platinum |
B. | Palladium |
C. | Tantalum |
D. | Lithium |
E. | None of the above |
Answer» D. Lithium |
92. |
Which of the following is donor impurity for semi-conductors? |
A. | Boron |
B. | Callium |
C. | Antimony |
D. | Indium |
E. | Aluminium |
Answer» C. Antimony |
93. |
A concrete wall generally |
A. | Isentropic material |
B. | Creates sound |
C. | Transmits sound |
D. | Reflects sound |
E. | Absorbs sound |
Answer» D. Reflects sound |
94. |
The effect f rolling on steel is |
A. | To elongate the inclusions in the direction of rolling giving the steel excellent properties |
B. | Reduction in tensile strength |
C. | Reduction in fatigue strength |
D. | Reduction in hardness |
E. | None of the above |
Answer» A. To elongate the inclusions in the direction of rolling giving the steel excellent properties |
95. |
Fatigue failure occurs when a part is subjected to |
A. | Tensile stress |
B. | Compressive stress |
C. | Torsion |
D. | Fluctuating stress |
E. | None of the above |
Answer» D. Fluctuating stress |
96. |
Heavy water is used in atomic power plants as |
A. | Source of energy |
B. | Moderator |
C. | Lubricant |
D. | Fuel |
E. | Viscous damping fluid |
Answer» B. Moderator |
97. |
The surface hardness that can be obtained by nitriding is generally in the range |
A. | 600 to 800 VPN |
B. | Strength and hardness of steel is increased |
C. | 400 to 600 VPN |
D. | 1000 to 1100 VPN |
E. | Below 400 VPN |
Answer» D. 1000 to 1100 VPN |
98. |
Residual magnetism is |
A. | Magnetism left in a sample after a decade |
B. | Magnetism left in a sample after one year |
C. | Flux density present in a material after magnetising force is removed |
D. | The magnetic force required to fully demagnetise a sample |
E. | None of the above |
Answer» C. Flux density present in a material after magnetising force is removed |
99. |
Every material obeys the Hooke's law within |
A. | Breaking limit |
B. | Elastic limit |
C. | Plastic limit |
D. | Limit of proportionality |
E. | Yield limit |
Answer» B. Elastic limit |
100. |
In cast irons |
A. | Impact strength is high |
B. | With static loading the strength in tension is higher than that in compression |
C. | With static loading the strength in tension is lower than that in compression |
D. | (A) and (B) above |
E. | (A) and (C) above |
Answer» C. With static loading the strength in tension is lower than that in compression |
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