McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 101. |
Which of the following is usually made of dead mild steel? |
| A. | Flanges |
| B. | Shafts |
| C. | Spades |
| D. | Gears |
| E. | Fish plates |
| Answer» A. Flanges | |
| 102. |
The fastest cooling rate is achieved when steel is quenched in |
| A. | Brine |
| B. | Soldering |
| C. | Oil |
| D. | Water |
| E. | Air |
| Answer» A. Brine | |
| 103. |
An operation on steel aimed at softening the steel to improve machinability is known as |
| A. | Annealing |
| B. | Cold working |
| C. | Softening |
| D. | Temperature |
| E. | Shot blasting |
| Answer» A. Annealing | |
| 104. |
Which of the following material can bear sudden and excessive shocks better? |
| A. | White iron |
| B. | Pig iron |
| C. | Wrought iron |
| D. | All have same shock bearing capacity |
| E. | Cast iron |
| Answer» C. Wrought iron | |
| 105. |
The process for steel making used at TISCO, Jamshedpur is |
| A. | Duplex process |
| B. | Open hearth process |
| C. | Bessemmer process |
| D. | L-D process |
| E. | Electric process |
| Answer» A. Duplex process | |
| 106. |
In Brinell hardness testing the minimum thickness of the specimen should be |
| A. | More than 10 times the depth of impression |
| B. | Less than 10 times the depth of impression |
| C. | Less than 5 times the depth of impression |
| D. | Thickness of specimen has no relevance to the depth of impression |
| E. | Equal to 10 times the depth of impression |
| Answer» A. More than 10 times the depth of impression | |
| 107. |
Vicker's hardness number of diamond could be of the order of |
| A. | 8000 |
| B. | 800 |
| C. | 4000 |
| D. | 15000 |
| E. | 12000 |
| Answer» A. 8000 | |
| 108. |
Carbon percentage in cutlery stainless steel is |
| A. | 1.35 to 1.65 percent |
| B. | 1.1 to 1.35 percent |
| C. | 1 percent |
| D. | 0.76 to 0.80 percent |
| E. | 0.25 to 0.30 percent |
| Answer» E. 0.25 to 0.30 percent | |
| 109. |
The crystal structure of gamma iron is |
| A. | BCC |
| B. | Combination of all above |
| C. | ACP |
| D. | Cubic |
| E. | FCC |
| Answer» E. FCC | |
| 110. |
High carbon steels intended to be quenched in water should have manganese percentage less than |
| A. | 1.5 percent |
| B. | 0.5 percent |
| C. | 2 percent |
| D. | 1 percent |
| E. | No manganese percent |
| Answer» B. 0.5 percent | |
| 111. |
A fine grained steel will have the number of grains per square centimeter as |
| A. | 100 to 150 |
| B. | 150 to 1000 |
| C. | 16 to 56 |
| D. | 3 to 16 |
| E. | 56 to 100 |
| Answer» D. 3 to 16 | |
| 112. |
Uniformity of zinc coating on pipes is tested by |
| A. | Dipping the sample in water |
| B. | Dipping the sample for 10 minutes in calcium hydroxide solution |
| C. | Dipping the sample for 1 minute in conc, hydrochloric acid |
| D. | Dipping the sample for 1 minute in neutral copper sulphate solution |
| E. | By passing electric current for 1 hour |
| Answer» D. Dipping the sample for 1 minute in neutral copper sulphate solution | |
| 113. |
Which of the following materials are usually most ductile? |
| A. | Amorphous |
| B. | Face centred cubic lattice |
| C. | Non-metallic |
| D. | Body centred lattice |
| E. | Hexagonal close-packed lattice |
| Answer» B. Face centred cubic lattice | |
| 114. |
In grey cast iron, free graphite is in the form of |
| A. | Fine powder |
| B. | Needles |
| C. | Nodules |
| D. | Crystals |
| E. | Flakes |
| Answer» E. Flakes | |
| 115. |
Volume of air required to melt one ton of cast iron in a cupola at N.T.P. is roughly |
| A. | 10000 cubic metres of air |
| B. | 10 cubic metres of air |
| C. | 100000 cubic metres of air |
| D. | 100 cubic metres of air |
| E. | 1000 cubic metres of air |
| Answer» D. 100 cubic metres of air | |
| 116. |
The property of a metal when the recovery after unloading is complete but not instantaneous is |
| A. | 9 |
| B. | Viscoelasticity |
| C. | Inelasticity |
| D. | Anelasticity |
| E. | creep |
| Answer» D. Anelasticity | |
| 117. |
Standard electrical resistance are made of |
| A. | Invar |
| B. | Manganin |
| C. | Tungsten |
| D. | Phosphor bronze |
| E. | Constantan |
| Answer» E. Constantan | |
| 118. |
A chisel for cutting steel plates is usually |
| A. | Hardened and tempered |
| B. | Annealed |
| C. | Hardened |
| D. | Tempered |
| E. | Tempered and annealed |
| Answer» A. Hardened and tempered | |
| 119. |
Cracks of a vertical nature and dark coloured fissures in a sample of hardened steel indicate that |
| A. | Steel has not been properly heated |
| B. | Steel has been burned |
| C. | Steel contains excessive alloying elements |
| D. | Steel has been properly hardened |
| E. | Steel has achieved maximum possible hardness in accordance with the carbon percentage |
| Answer» B. Steel has been burned | |
| 120. |
Which of the following material is viscoelastic in properties? |
| A. | Graphite |
| B. | Rubber |
| C. | Glass |
| D. | Cork |
| E. | None of the above |
| Answer» B. Rubber | |
| 121. |
Brinell hardness of nitrided surface may be of the order of |
| A. | More than 600 |
| B. | 200 to 250 |
| C. | 300 to 450 |
| D. | 150 to 200 |
| E. | 100 |
| Answer» A. More than 600 | |
| 122. |
If a medium carbon hardened steel shows pearlite structure it may be concluded that |
| A. | Steel contains impurities |
| B. | Presence of cementite |
| C. | Steel has been quenched in oil |
| D. | Steel has been quenched in water |
| E. | Steel has been slowly cooled in furnace |
| Answer» E. Steel has been slowly cooled in furnace | |
| 123. |
Alpha brass is a (an) |
| A. | Inermediate phase |
| B. | Interstitial compound |
| C. | Substitutional solid solution |
| D. | None of the above |
| E. | 2.10% |
| Answer» C. Substitutional solid solution | |
| 124. |
Which of the following is a non-destructive test? |
| A. | Tensile test |
| B. | Cupping test |
| C. | Charpy test |
| D. | X-ray test |
| E. | Izod Impact test |
| Answer» D. X-ray test | |
| 125. |
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» C. 1.4 ton | |
| 126. |
Warping of articles during heat treatment may be due to |
| A. | internal stresses in the article before heating |
| C. | Low specific heat of quenching oil |
| D. | non-uniform cooling |
| E. | non-uniform heating |
| Answer» A. internal stresses in the article before heating | |
| 127. |
In eddy current heating of steel, if the depth of heating is to be increased |
| A. | Voltage should be high |
| B. | Some resisting material must be applied on the surface of article to be heated |
| C. | Frequency must be low |
| D. | Time of heating should be high |
| E. | Frequency must be high |
| Answer» C. Frequency must be low | |
| 128. |
The maximum percentage of carbon in ferrite is |
| A. | 0.25% |
| B. | 0.03% |
| C. | 0.00% |
| D. | 0.04% |
| E. | 0.13% |
| Answer» B. 0.03% | |
| 129. |
The percentage of carbon in cold rolled steel sheets is around |
| A. | 2.10% |
| B. | 0.01% |
| C. | 0.80% |
| D. | 0.10% |
| E. | 1.10% |
| Answer» D. 0.10% | |
| 130. |
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» D. Uneven heating | |
| 131. |
A steel piece after hardening is heated to 300?C and then cooled in oil. The property imparted to the steel piece will be |
| A. | Hardness |
| B. | Annealing |
| C. | Low specific heat of quenching oil |
| D. | Toughness |
| E. | Softness |
| Answer» D. Toughness | |
| 132. |
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» C. That steel which is deoxidised in the ladle with silicon and aluminium | |
| 133. |
Which of the following metal has the lowest specific gravity? |
| A. | Cast iron |
| B. | Monal metal |
| C. | Copper |
| D. | Bronze |
| E. | Magnesium |
| Answer» E. Magnesium | |
| 134. |
The crystal structure of most of the common metals is |
| A. | Hexagonal |
| B. | Cubic |
| C. | Orthorhombic |
| D. | Any of the above |
| E. | None of the above |
| Answer» B. Cubic | |
| 135. |
Iron ore which is grey to black in colour and is hard and magnetic, is known as |
| A. | Hematite |
| B. | Siderite |
| C. | Ironite |
| D. | Limonite |
| E. | Magnetite |
| Answer» E. Magnetite | |
| 136. |
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» B. Air | |
| 137. |
Which of the following material does not have body centred cubic structure? |
| A. | Vanadium |
| B. | Chromium |
| C. | Zirconium |
| D. | Lithium |
| E. | Potassium |
| Answer» C. Zirconium | |
| 138. |
The crystal structure of brass is |
| A. | Mixture of all above |
| B. | BCC |
| C. | FCC |
| D. | Orthorhombic |
| E. | HCP |
| Answer» C. FCC | |
| 139. |
Which of the following material is used for thermocouple junction? |
| A. | Magnanin |
| B. | Nichrome |
| C. | Invar |
| D. | Petwar |
| E. | White metal |
| Answer» A. Magnanin | |
| 140. |
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» A. Insufficient holding time during tempering | |
| 141. |
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» A. Career | |
| 142. |
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» C. Ferromagnetic field | |
| 143. |
Above the curie temperature, a magnetic material becomes |
| A. | Diamagnetic |
| B. | Paramagnetic |
| C. | Ferromagnetic |
| D. | Dielectric |
| E. | None of the above |
| Answer» B. Paramagnetic | |
| 144. |
Which of the follwing is usually made of mild steel? |
| A. | Drop forgings |
| B. | Fish plates |
| C. | Shear blades |
| D. | Channels |
| E. | Die blocks |
| Answer» D. Channels | |
| 145. |
Bell metal is an alloy of |
| A. | Copper and lead |
| B. | Coper, tin, lead and zinc |
| C. | Copper, antimony, aluminium and zinc |
| D. | Copper and tin |
| E. | Copper, lead and tin |
| Answer» D. Copper and tin | |
| 146. |
Which of the following material has body centred cubic structure? |
| A. | Magnesium |
| B. | Cadmium |
| C. | Glass |
| D. | Zinc. |
| E. | Molybdenum |
| Answer» E. Molybdenum | |
| 147. |
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» C. 497 | |
| 148. |
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» C. Tons of castings it can produce in one charge | |
| 149. |
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» B. normalising or annealing followed by hardening | |
| 150. |
Cast iron pipes are manufactured by |
| A. | Centrifugal casting method |
| B. | Die casting method |
| C. | Lost wax method |
| D. | Shell moulding method |
| E. | Sand acting method |
| Answer» A. Centrifugal casting method | |
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