MCQOPTIONS
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MCQOPTIONS
This section includes 614 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
In a unit cell of close packed hexagonal space lattice, there are twenty four atoms. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 52. |
Brittle materials when subjected to tensile loads, snap off without giving any sensible elongation. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 53. |
The approximate height of a blast furnace is |
| A. | 10 m |
| B. | 20 m |
| C. | 30 m |
| D. | 40 m |
| Answer» D. 40 m | |
| 54. |
Cast iron is a ductile material. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 55. |
In normalising process, the hypo-eutectiod steel is heated from 30° C to 50° C above the upper critical temperature and then cooled in still air. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 56. |
The limestone in the charge of a blast furnace decomposes to give lime and carbon dioxide. The lime thus obtained |
| A. | controls the grade of pig iron |
| B. | acts as an iron-bearing mineral |
| C. | supplies heat to reduce ore and melt the iron |
| D. | forms a slag by combining with impurities |
| Answer» E. | |
| 57. |
The delta-iron possesses a body centred cubic space lattice. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 58. |
Which of the following statement is incorrect about duralumin? |
| A. | It is prone to age hardening |
| B. | It can be forged |
| C. | It has good machining properties |
| D. | It is lighter than pure aluminium |
| Answer» E. | |
| 59. |
Iron-carbon alloys containing 4.3% carbon are known as hypo-eutectic cast irons. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 60. |
The slag from the blast furnace |
| A. | is used as a ballast for rail road |
| B. | is mixed with tar for road making |
| C. | consists of calcium, aluminium and ferrous silicates |
| D. | all of the above |
| Answer» E. | |
| 61. |
Thermosetting plastics are those materials which |
| A. | are formed into shape under heat and pressure and results in a permanently hard product |
| B. | do not become hard with the application of heat and pressure and no chemical change occurs |
| C. | are flexible and can withstand considerable wear under suitable conditions |
| D. | are used as a friction lining for clutches and brakes |
| Answer» B. do not become hard with the application of heat and pressure and no chemical change occurs | |
| 62. |
Micro-structure of a material is, generally, examined by |
| A. | naked eye |
| B. | optical microscope |
| C. | X-ray techniques |
| D. | none of these |
| Answer» E. | |
| 63. |
The carbon in the pig iron varies from |
| A. | 0.1 to 0.5% |
| B. | 0.5 to 1% |
| C. | 1 to 5% |
| D. | 5 to 10% |
| Answer» D. 5 to 10% | |
| 64. |
Delta-iron occurs between the temperature range of |
| A. | 400°C to 600°C |
| B. | 600°C to 900°C |
| C. | 900°C to 1400°C |
| D. | 1400°C to 1530°C |
| Answer» E. | |
| 65. |
Silicon bronze contains |
| A. | 60% copper, 35% zinc and 5% manganese |
| B. | 88% copper, 10% tin and 2% zinc |
| C. | 96% copper, 3% silicon and 1% manganese |
| D. | 76% copper, 20% silicon and 4% zinc |
| Answer» D. 76% copper, 20% silicon and 4% zinc | |
| 66. |
A steel containing 12 to 14% chromium and 0.12 to 0.35% carbon is called martensitic stainless steel. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 67. |
Manganese bronze has |
| A. | good wearing qualities and high elasticity |
| B. | high yield point, high fatigue limit and excellent cold and hot corrosion resistance |
| C. | high resistance to corrosion |
| D. | valuable cold working property |
| Answer» D. valuable cold working property | |
| 68. |
In induction hardening, the depth of hardening is controlled by controlling the voltage. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 69. |
The compressive strength of cast iron is __________ that of its tensile strength. |
| A. | equal to |
| B. | less than |
| C. | more than |
| D. | None of these |
| Answer» D. None of these | |
| 70. |
The ability of a material to resist fracture due to high impact loads, is called |
| A. | strength |
| B. | stiffness |
| C. | toughness |
| D. | brittleness |
| Answer» D. brittleness | |
| 71. |
Face centred cubic space lattice is found in gamma-iron, aluminium, copper, lead, silver and nickel. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 72. |
The process used for relieving the internal stresses previously set up in the Metal and for increasing the machinability of steel, is |
| A. | normalising |
| B. | full annealing |
| C. | process annealing |
| D. | spheroidising |
| Answer» D. spheroidising | |
| 73. |
Which of the following solids are malleable and ductile? |
| A. | Ionic solids |
| B. | Covalent solids |
| C. | Metallic solids |
| D. | none of these |
| Answer» D. none of these | |
| 74. |
The addition of copper to aluminium possesses maximum strength after heat treatment and age-hardening |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 75. |
The maximum internal diameter of a blast furnace is about |
| A. | 3 m |
| B. | 6 m |
| C. | 9 m |
| D. | 12 m |
| Answer» D. 12 m | |
| 76. |
In a close packed hexagonal space lattice, there are |
| A. | nine atoms out of which eight atoms are located at the corners of the cube and one atom at its centre |
| B. | twelve atoms, all of which are located at the twelve corners of a hexagonal prism |
| C. | fourteen atoms out of which eight atoms are located at the coners of the cube and six atoms at the centres of six faces |
| D. | none of the above |
| Answer» E. | |
| 77. |
The iron ore in the charge of blast furnace acts as an iron bearing mineral. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 78. |
Phosphor bronze has |
| A. | high resistance to corrosion |
| B. | good wearing qualities and high elasticity |
| C. | valuable cold working property |
| D. | all of these |
| Answer» C. valuable cold working property | |
| 79. |
Cartidge brass can be |
| A. | cold rolled into sheets |
| B. | drawn into wires |
| C. | formed into tube |
| D. | any one of these |
| Answer» E. | |
| 80. |
18-4-1 high speed steel contains |
| A. | vanadium 4%, chromium 18% and tungsten 1% |
| B. | vanadium 1%, chromium 4% and tungsten 18% |
| C. | vanadium 18%, chromium 1% and tungsten 4% |
| D. | none of the above |
| Answer» C. vanadium 18%, chromium 1% and tungsten 4% | |
| 81. |
The acidic bessemer process is suitable for producing steel from pig iron containing large quantities of phosphorus. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 82. |
In high speed steels, vanadium adds to the property of red hardness and tungsten and chromium add to high wear resistance. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 83. |
Which of the following iron exists at 910° C? |
| A. | α-iron |
| B. | β-iron |
| C. | γ-iron |
| D. | δ-iron |
| Answer» B. β-iron | |
| 84. |
The temperature point at which the change starts on heating the steel is called |
| A. | lower critical point |
| B. | upper critical point |
| C. | point of recalescence |
| D. | point of decalescence |
| Answer» B. upper critical point | |
| 85. |
During the operation of a bessemer converter, the white flame indicates that the silicon and managenese had burnt and carbon has started oxidising. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 86. |
In the austempering process of heat treatment, austenite changes into |
| A. | martensite |
| B. | troostite |
| C. | sorbite |
| D. | bainite |
| Answer» E. | |
| 87. |
The stiffness is the ability of a material to resist deformation under stress. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 88. |
A steel with carbon __________ is known as hypo-eutectoid steel. |
| A. | 0.8% |
| B. | below 0.8% |
| C. | above 0.8% |
| D. | None of these |
| Answer» C. above 0.8% | |
| 89. |
The aluminium alloy made by melting aluminium with 2 to 10% magnesium and 1.75% copper is called |
| A. | duralumin |
| B. | Y-alloy |
| C. | magnalium |
| D. | hindalium |
| Answer» D. hindalium | |
| 90. |
Grey cast iron is __________ than white cast iron. |
| A. | softer |
| B. | harder |
| C. | Can't say |
| D. | None of these |
| Answer» B. harder | |
| 91. |
Which of the following is a case hardening process? |
| A. | Carburising |
| B. | Cyaniding |
| C. | Nitriding |
| D. | all of these |
| Answer» E. | |
| 92. |
The alloy, mainly used for corrosion resistance in stainless steels is |
| A. | silicon |
| B. | manganese |
| C. | carbon |
| D. | chromium |
| Answer» E. | |
| 93. |
Hindalium is an alloy of aluminium and magnesium with a small quantity of chromium. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 94. |
The upper critical point varies according to the carbon content in steel. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 95. |
A steel containing ferrite and pearlite is |
| A. | hard |
| B. | soft |
| C. | tough |
| D. | hard and tough |
| Answer» C. tough | |
| 96. |
The property of a material necessary for forgings, in stamping images on coins and in ornamental work, is |
| A. | elasticity |
| B. | plasticity |
| C. | ductility |
| D. | malleability |
| Answer» C. ductility | |
| 97. |
The process of inducing carbon to __________ carbon steels in order to give it a hard surface is known as carburising. |
| A. | low |
| B. | medium |
| C. | high |
| D. | None of these |
| Answer» B. medium | |
| 98. |
A steel with carbon above 0.8% is known as hyper-eutectoid steel. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 99. |
The percentage of phosphorus is phosphor bronze is |
| A. | 0.1 |
| B. | 1 |
| C. | 11.1 |
| D. | 98 |
| Answer» B. 1 | |
| 100. |
Aluminium bronze has high resistance to corrosion. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |