

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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