McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 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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