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MCQOPTIONS
This section includes 224 Mcqs, each offering curated multiple-choice questions to sharpen your Metallurgy knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
During heat treatment, deformation and volume changes can be minimised by |
| A. | slowly cooling in the martensitic range |
| B. | using surface hardening when possible |
| C. | using alloy steels least prone to such changes |
| D. | Any of the above |
| E. | Low specific heat of quenching oil |
| Answer» E. Low specific heat of quenching oil | |
| 52. |
Lowest melting point may be expected for |
| A. | Brass |
| B. | Lead |
| C. | Zirconium |
| D. | Copper |
| E. | Aluminium |
| Answer» C. Zirconium | |
| 53. |
Nichrome contains |
| A. | Nickel, lead and zinc |
| B. | Nickel and copper |
| C. | Nickel and chromium |
| D. | Nickel, copper and vanadium |
| E. | Nickel, chromium and vanadium |
| Answer» D. Nickel, copper and vanadium | |
| 54. |
Which of the following is not true in case of white cast iron |
| A. | It is strong |
| B. | It is brittle |
| C. | It is malleable |
| D. | It is whitish in colour |
| E. | It is hard |
| Answer» D. It is whitish in colour | |
| 55. |
The effect of austenitic grain size development during heat treatment is |
| A. | lower hardenability |
| B. | greater toughness |
| C. | lower internal stress |
| D. | All of the above |
| E. | Low specific heat of quenching oil |
| Answer» C. lower internal stress | |
| 56. |
Hardening by carburizing is limited to |
| A. | 2 mm |
| B. | 5 mm |
| C. | 0.05 mm |
| D. | Low specific heat of quenching oil |
| E. | 0.1 mm |
| Answer» B. 5 mm | |
| 57. |
Stellite contains |
| A. | Nickel, zinc and aluminium |
| B. | Nickel, copper and zinc |
| C. | Cobalt, chromium and tungsten |
| D. | Copper, tin and lead |
| E. | Cobalt, vanadium and nickel |
| Answer» D. Copper, tin and lead | |
| 58. |
Which of the following constituent will increase the hardness of steel? |
| A. | Martensite |
| B. | Pearlite |
| C. | Austenite |
| D. | Cementite |
| E. | All of the above |
| Answer» B. Pearlite | |
| 59. |
The maximum percentage of carbon in austenite is |
| A. | 2% |
| B. | 2.70% |
| C. | 1.70% |
| D. | 0.07% |
| E. | 0.70% |
| Answer» D. 0.07% | |
| 60. |
Warping may be avoided when quenching a long slender piece of work by |
| A. | Holding the work piece between clamps and pouring water on it |
| B. | Hoding the work piece vertically over the quenching bath and plunging it straight |
| C. | Pulling the piece from both ends |
| D. | Holding the piece horizontally in adequate supports |
| E. | None of the above |
| Answer» C. Pulling the piece from both ends | |
| 61. |
Fusible plug for boilers consists of |
| A. | Zinc, bismuth and tin |
| B. | Lead, tin and mercury |
| C. | Copper, lead and tin |
| D. | Bismuth, lead and tin |
| E. | Zinc, copper and lead |
| Answer» E. Zinc, copper and lead | |
| 62. |
Dilute nitric acid applied to a clean fracture of white cast iron will produce |
| A. | Grey stain |
| B. | Black stain |
| C. | Pink stain |
| D. | White stain |
| E. | Brown stain |
| Answer» F. | |
| 63. |
Manganese is added to steel primarily to increase |
| A. | Malleability |
| B. | Ductility |
| C. | Fatigue strength |
| D. | Endurance limit |
| E. | Tensile strength |
| Answer» F. | |
| 64. |
In order to observe the grain size of steel samples under microscope, the magnification should be the order of |
| A. | 2 |
| B. | 20 |
| C. | 1500 |
| D. | 100 |
| E. | 10 |
| Answer» E. 10 | |
| 65. |
In Brinell hardness testing the timer for loading is |
| A. | 15 seconds |
| B. | 1 second |
| C. | 5 seconds |
| D. | 1 minute |
| E. | 2 seconds |
| Answer» B. 1 second | |
| 66. |
Which of the following furnaces is not used for non-ferrous materials |
| A. | Gas fired tilting furnace |
| B. | Pit furnace |
| C. | Cupola |
| D. | Crucible furnace |
| E. | Oil fired tilting furnace |
| Answer» D. Crucible furnace | |
| 67. |
Which of the following structure is least hard? |
| A. | Pearlite |
| B. | Presence of cementite |
| C. | Martensite |
| D. | Sorbite |
| E. | Troosite |
| Answer» B. Presence of cementite | |
| 68. |
Which of the following material is not used for cyaniding? |
| A. | Sodium carbonate |
| B. | Sodium chloride |
| C. | Sodium hydroxide |
| D. | Sodium cyanide |
| E. | All of the above |
| Answer» D. Sodium cyanide | |
| 69. |
All of the following are magnetic materials EXCEPT |
| A. | Cast iron |
| B. | Zinc |
| C. | Nickel |
| D. | Cobalt |
| E. | Iron |
| Answer» C. Nickel | |
| 70. |
Silicon when added to copper increases its |
| A. | Brittleness |
| B. | Malleability |
| C. | Electrical conductivity |
| D. | Hardness |
| E. | Machinability |
| Answer» E. Machinability | |
| 71. |
Just as strong is opposite of weak likewise elastic is opposite of |
| A. | Rigid |
| B. | Soft |
| C. | Ductile |
| D. | Inelastic |
| E. | Hard |
| Answer» B. Soft | |
| 72. |
Which of the following is not a constituent of Stellite? |
| A. | Cobalt |
| B. | Tungsten |
| C. | Ferrous |
| D. | Chromium |
| E. | All of the above |
| Answer» D. Chromium | |
| 73. |
In which process steel is heated below the critical temperature |
| A. | Temperting |
| B. | Hardening |
| C. | Carburizing |
| D. | Annealing |
| E. | Normalizing |
| Answer» B. Hardening | |
| 74. |
Under identical values of cold and hot junction temperatures which thermocouple given the highest output |
| A. | Iron constantan |
| B. | All give equal output |
| C. | Nickel nimo |
| D. | Chromel-constantan |
| E. | Platinum-platinum-rhodium |
| Answer» E. Platinum-platinum-rhodium | |
| 75. |
Invar is an alloy of |
| A. | Iron and copper |
| B. | Iron and nickel |
| C. | Iron and chromium |
| D. | Iron and zinc |
| E. | Iron and vanadium |
| Answer» C. Iron and chromium | |
| 76. |
Highest specific gravity is of |
| A. | Titanium |
| B. | Copper |
| C. | Lead |
| D. | Steel |
| E. | Brass |
| Answer» D. Steel | |
| 77. |
If an article develops insufficient hardening after quenching, the defect can be corrected by |
| A. | removing scale from surface |
| B. | normalising or annealing followed by hardening |
| C. | reheating the article in oxidizing atmosphere and quenching |
| D. | Any of the above |
| E. | Low specific heat of quenching oil |
| Answer» C. reheating the article in oxidizing atmosphere and quenching | |
| 78. |
Chilling, heat treatment and alloy addition to cast iron generally |
| A. | reduces machinability |
| B. | reduces carbon percentage |
| C. | reduces wear resistance |
| D. | improves machinability |
| E. | None of the above |
| Answer» B. reduces carbon percentage | |
| 79. |
For each ton of pig iron produced from blast furnace, the lime stone used is approximately |
| A. | 0.01 ton |
| B. | 0.4 tom |
| C. | 0.1 ton |
| D. | 1.4 ton |
| E. | 2.55 tons |
| Answer» C. 0.1 ton | |
| 80. |
Which of the following material has body centred cubic structure? |
| A. | Magnesium |
| B. | Cadmium |
| C. | Glass |
| D. | Zinc. |
| E. | Molybdenum |
| Answer» F. | |
| 81. |
The measurement junction of a thermocouple is taken from an environment of 300?C to 600?C. If time constant of the thermocouple is 1 second, temperature indicated by it, in ?C, after 1 second would be about |
| A. | 400 |
| B. | 457 |
| C. | 497 |
| D. | 600 |
| E. | 100 |
| Answer» D. 600 | |
| 82. |
In a specimen of hardened steel, hard and soft spots indicate |
| A. | Presence of pearlite |
| B. | Fre carbon |
| C. | Presence of cementite |
| D. | Uneven heating |
| E. | Non-uniform composition of steel |
| Answer» E. Non-uniform composition of steel | |
| 83. |
For each ton of pig iron produced in blast furnace, the quantity of coke required would be roughly |
| A. | 0.5 ton |
| B. | 0.25 ton |
| C. | 1.4 ton |
| D. | 1.9 ton |
| E. | 0.1 ton |
| Answer» D. 1.9 ton | |
| 84. |
Killed' steel is |
| A. | Steel with less than normal percentage of carbon |
| B. | Steel which has been shaped on a power hammer |
| C. | That steel which is deoxidised in the ladle with silicon and aluminium |
| D. | Steel with more than normal percentage of carbon |
| E. | Steel that has lost its properties due to excessive alloying |
| Answer» D. Steel with more than normal percentage of carbon | |
| 85. |
Which of the following metal has the lowest specific gravity? |
| A. | Cast iron |
| B. | Monal metal |
| C. | Copper |
| D. | Bronze |
| E. | Magnesium |
| Answer» F. | |
| 86. |
Above the curie temperature, a magnetic material becomes |
| A. | Diamagnetic |
| B. | Paramagnetic |
| C. | Ferromagnetic |
| D. | Dielectric |
| E. | None of the above |
| Answer» C. Ferromagnetic | |
| 87. |
Warping of articles during heat treatment may be due to |
| A. | internal stresses in the article before heating |
| B. | Low specific heat of quenching oil |
| C. | non-uniform cooling |
| D. | non-uniform heating |
| Answer» B. Low specific heat of quenching oil | |
| 88. |
If a sample of steel shown excessive hardness after tempering the probable cause could be |
| A. | Insufficient holding time during tempering |
| B. | Excessive proportion of alloying elements |
| C. | High temperature during tempering |
| D. | Change in volume during cooling |
| E. | None of the above |
| Answer» B. Excessive proportion of alloying elements | |
| 89. |
Capacity of a cupola is expressed in terms of |
| A. | Diameter of drum |
| B. | Height of drum |
| C. | Tons of castings it can produce in one charge |
| D. | Tons of coke it can take in one charge |
| E. | None of the above |
| Answer» D. Tons of coke it can take in one charge | |
| 90. |
Magnetism is non-linearly related to the applied field in case of |
| A. | Diamagnetic field |
| B. | Paramagnetic field |
| C. | Ferromagnetic field |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 91. |
The maximum percentage of carbon in ferrite is |
| A. | 0.25% |
| B. | 0.03% |
| C. | 0.00% |
| D. | 0.04% |
| E. | 0.13% |
| Answer» C. 0.00% | |
| 92. |
Which of the following material does not have body centred cubic structure? |
| A. | Vanadium |
| B. | Chromium |
| C. | Zirconium |
| D. | Lithium |
| E. | Potassium |
| Answer» D. Lithium | |
| 93. |
Which of the following material is used for thermocouple junction? |
| A. | Magnanin |
| B. | Nichrome |
| C. | Invar |
| D. | Petwar |
| E. | White metal |
| Answer» B. Nichrome | |
| 94. |
The slowest cooling rate is achieved when steel is quenched in |
| A. | mixture of water |
| B. | Air |
| C. | Brine |
| D. | fused salt |
| E. | Hardened and tempered |
| Answer» C. Brine | |
| 95. |
Which of the following metal has face centred cubic structure? |
| A. | Tin |
| B. | Gold |
| C. | Magnesium |
| D. | Zinc |
| E. | Cadmium |
| Answer» C. Magnesium | |
| 96. |
If a sample of steel shows unsymmetrical deformation of a piece in quenching, the probable cause could be |
| A. | Impure quenching oil |
| B. | Low specific heat of quenching oil |
| C. | Excessive proportion of alloying elements |
| D. | Non-uniform heating or cooling |
| E. | Low temperature during heating |
| Answer» E. Low temperature during heating | |
| 97. |
Which of the following is usually not a constituent of paints? |
| A. | Career |
| B. | Vehicle |
| C. | Pigment |
| D. | Drier |
| E. | None of the above |
| Answer» B. Vehicle | |
| 98. |
Which allotropic form of iron is magnetic at room temperature? |
| A. | Alpha iron |
| B. | Beta iron |
| C. | Gamma iron |
| D. | Delta iron |
| E. | All of the above |
| Answer» B. Beta iron | |
| 99. |
Nickel is |
| A. | Ferromagnetic |
| B. | Ferroelectric |
| C. | Dielectric |
| D. | Paramagnetic |
| E. | None of the above |
| Answer» B. Ferroelectric | |
| 100. |
The allotropic form of iron not having body centred cubic lattice is |
| A. | Alpha iron |
| B. | Beta iron |
| C. | Gamma iron |
| D. | Delta iron |
| E. | All of the above |
| Answer» E. All of the above | |