MCQOPTIONS
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MCQOPTIONS
This section includes 482 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
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. | |
| 52. |
Brittle materials when subjected to tensile loads, snap off without giving any sensible elongation. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 53. |
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 | |
| 54. |
The phosphorus and sulphur in steel making can be removed by using basic bessemer process. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 55. |
The heat treatment process used for castings is |
| A. | carburising |
| B. | normalising |
| C. | annealing |
| D. | tempering |
| Answer» C. annealing | |
| 56. |
Silicon is added in low carbon steels to |
| A. | make the steel tougher and harder |
| B. | make the steel of good bending qualities |
| C. | raise the yield point |
| D. | all of these |
| Answer» B. make the steel of good bending qualities | |
| 57. |
According to Indian standard specifications, cast iron designated by 'FG 150' means |
| A. | white cast iron with B.H.N. 150 |
| B. | white cast iron with 150 MPa as minimum compressive strength |
| C. | grey cast iron with B.H.N. 150 |
| D. | grey cast iron with 150 MPa as minimum tensile strength |
| Answer» E. | |
| 58. |
The red flame during the operation of a bessemer converter indicates that the |
| A. | air is burning out silicon and manganese |
| B. | silicon and manganese has burned out and carbon has started oxidising |
| C. | converter must be tilted to remove the contents of the converter |
| D. | red flame does not occur during the operation of a bessemer converter |
| Answer» E. | |
| 59. |
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 | |
| 60. |
In the austempering process of heat treatment, austenite changes into |
| A. | martensite |
| B. | troostite |
| C. | sorbite |
| D. | bainite |
| Answer» E. | |
| 61. |
The ductility is the property of a material due to which it |
| A. | can be drawn into wires |
| B. | breaks with little permanent distortion |
| C. | can be rolled or hammered into thin sheets |
| D. | can resist fracture due to high impact loads |
| Answer» B. breaks with little permanent distortion | |
| 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 addition of magnesium to cast iron increases its |
| A. | hardness |
| B. | ductility and strength in tension |
| C. | corrosion resistance |
| D. | creep strength |
| Answer» C. corrosion resistance | |
| 64. |
The slow cooling of steel from the __________ results in a coarse grained structure. |
| A. | lower critical point |
| B. | upper critical point |
| Answer» C. | |
| 65. |
Which one of the following sets of constituents is expected in equilibrium cooling of a hyper-eutectoid steel from austenitic state? |
| A. | Ferrite and pearlite |
| B. | Cementite and pearlite |
| C. | Ferrite and bainite |
| D. | Cementite and martensite |
| Answer» C. Ferrite and bainite | |
| 66. |
Hardness of steel is increased by adding sulphur, lead and phosphorus. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 67. |
The machine tool guide ways are usually hardened by |
| A. | vacuum hardening |
| B. | martempering |
| C. | induction hardening |
| D. | flame hardening |
| Answer» E. | |
| 68. |
A steel with 0.8% carbon and 100% pearlite is called |
| A. | eutectoid steel |
| B. | hypo-eutectoid steel |
| C. | hyper-eutectoid steel |
| D. | none of these |
| Answer» B. hypo-eutectoid steel | |
| 69. |
18/8 stainless steel consists of |
| A. | 18% nickel and 8% chromium |
| B. | 18% chromium and 8% nickel |
| C. | 18% nickel and 18% chromium |
| D. | 8% nickel and 8% chromium |
| Answer» C. 18% nickel and 18% chromium | |
| 70. |
Vanadium when added to steel |
| A. | increases tensile strength |
| B. | decreases tensile strength |
| C. | raises critical temperature |
| D. | Sowers critical temperature |
| Answer» B. decreases tensile strength | |
| 71. |
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. | |
| 72. |
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 |
| Answer» B. Disagree | |
| 73. |
Babbit metal contains |
| A. | 50% tin and 50% antimony |
| B. | 66% tin, 30% copper and 4% antimony |
| C. | 88% tin, 4% copper and 8% antimony |
| D. | 92% tin, 6% copper and 2% antimony |
| Answer» D. 92% tin, 6% copper and 2% antimony | |
| 74. |
A steel with 0.8% carbon is known as |
| A. | eutectoid steel |
| B. | hyper-eutectoid steel |
| C. | hypo-eutectiod steel |
| D. | none of these |
| Answer» B. hyper-eutectoid steel | |
| 75. |
When a steel containing more than 0.8% carbon is cooled slowly below the lower critical point, it consists of |
| A. | mainly pearlite |
| B. | mainly ferrite |
| C. | ferrite and pearlite |
| D. | pearlite and cementite |
| Answer» E. | |
| 76. |
The strength is the ability of a material to resist |
| A. | deformation under stress |
| B. | externally applied forces with breakdown or yielding |
| C. | fracture due to high impact loads |
| D. | none of these |
| Answer» C. fracture due to high impact loads | |
| 77. |
Which of the following is a case hardening process? |
| A. | Carburising |
| B. | Cyaniding |
| C. | Nitriding |
| D. | all of these |
| Answer» E. | |
| 78. |
In a crystalline material, atoms are arranged in definite and orderly manner and form. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 79. |
The austenitic stainless steel contains |
| A. | 18% chromium and 8% nickel |
| B. | 8% chromium and 18% nickel |
| C. | 14% chromium and 0.35% carbon |
| D. | 14% nickel and 0.35% carbon |
| Answer» B. 8% chromium and 18% nickel | |
| 80. |
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 | |
| 81. |
Steel containing upto 0.15% carbon, is known as |
| A. | mild steel |
| B. | dead mild steel |
| C. | medium carbon steel |
| D. | high carbon steel |
| Answer» C. medium carbon steel | |
| 82. |
The bond formed by transferring electrons from one atom to another is called |
| A. | ionic bond |
| B. | covalent bond |
| C. | metallic bond |
| D. | none of these |
| Answer» B. covalent bond | |
| 83. |
Connecting rod is, usually, made from |
| A. | low carbon steel |
| B. | high carbon steel |
| C. | medium carbon steel |
| D. | high speed steel |
| Answer» D. high speed steel | |
| 84. |
Which of the following inpurity in cast iron makes it hard and brittle? |
| A. | Silicon |
| B. | Sulphur |
| C. | Manganese |
| D. | Phosphorus |
| Answer» C. Manganese | |
| 85. |
The aluminium alloy, mainly used, for anodized utensil manufacture, is |
| A. | duralumin |
| B. | Y-alloy |
| C. | magnalium |
| D. | hindalium |
| Answer» E. | |
| 86. |
The coordination number of a face centred cubic space lattice is |
| A. | six |
| B. | twelve |
| C. | eighteen |
| D. | twenty |
| Answer» C. eighteen | |
| 87. |
In flame hardening, oxy-acetylene flame is used. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 88. |
Which of the following statements are true for annealing of steels? |
| A. | Steels are heated to 500 to 700° C |
| B. | Cooling is done slowly and steadily |
| C. | Internal stresses are relieved |
| D. | all of these |
| Answer» E. | |
| 89. |
The ability of a material to undergo large permanent deformation with the application of a tensile force, is called ductility. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 90. |
Which of the following steel making process is being adopted at Rourkela Steel Plant? |
| A. | Bessemer process |
| B. | Open-hearth process |
| C. | Electric process |
| D. | L-D process |
| Answer» E. | |
| 91. |
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% | |
| 92. |
Pearlite consists of |
| A. | 13% carbon and 87% ferrite |
| B. | 13% cementite and 87% ferrite |
| C. | 13% ferrite and 87% cementite |
| D. | 6.67% carbon and 93.33% iron |
| Answer» C. 13% ferrite and 87% cementite | |
| 93. |
For a steel containing 0.8% carbon |
| A. | there is no critical point |
| B. | there is only one critical point |
| C. | there are two critical points |
| D. | there can be any number of critical points |
| Answer» C. there are two critical points | |
| 94. |
In high speed steels, manganese is used to tougher the metal and to increase its |
| A. | yield point |
| B. | critical temperature |
| C. | melting point |
| D. | hardness |
| Answer» C. melting point | |
| 95. |
Macro-structure of a material is, generally, examined by |
| A. | naked eye |
| B. | optical microscope |
| C. | metallurgical microscope |
| D. | X-ray techniques |
| Answer» B. optical microscope | |
| 96. |
Aluminium has low density and addition of silicon improves its fluidity and therefore, its castability. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 97. |
The property of a material essential for spring materials is |
| A. | stiffness |
| B. | ductility |
| C. | resilience |
| D. | plasticity |
| Answer» D. plasticity | |
| 98. |
A steel with carbon above 0.8% is known as hyper-eutectoid steel. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 99. |
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 |
| Answer» B. False | |
| 100. |
The compressive strength of cast iron is __________ that of its tensile strength. |
| A. | equal to |
| B. | less than |
| C. | more than |
| Answer» D. | |