Search
.Management Sciences
Category: Materials and Construction
The presence of impurities in iron_________________?
A. Increases its melting point
B. Does not affect its melting point
C. Decreases its melting point
D. Makes it malleable
_____________ iron is produced, when molten pig iron is chilled suddenly?
A. White cast
B. Grey cast
C. Wrought
D. None of these
Which of the following alloy steels is the most suitable for making gun barrels and projectiles ?
A. Tungsten steel
B. Molybdenum steel
C. Nickel-chrome steel
D. Cobalt steel
Presence of nitrogen in steel___________________?
A. Makes it brittle
B. Increases its strength
C. Increases its hardness
D. Is desirable
Babbitt metals used for making bearings are _________________?
A. Tin or lead based alloys
B. Short of antifrictional properties
C. Having homogenous microstructure
D. Yellow metals
_____________ steel is widely used for the manufacture of motor car crankshafts?
A. Silicon
B. Nickel
C. Chrome
D. High speed
Hastelloy comprises of____________________?
A. Copper and tin
B. Copper and nickel
C. Molybdenum and nickel
D. Lead and tin
Which one is remelted and poured into moulds to get cast iron ?
A. Wrought iron
B. Pig iron
C. Low carbon steel
D. Mild steel
The loss of strength in compression which occurs, when there is a gain of strength in tension due to over loading is called__________________?
A. Bauschinger effect
B. Hooke’s effect
C. Hysteresis
D. Relaxation
Balls in a ball mill are usually made of__________________?
A. Steel
B. Cast iron
C. Stainless steel
D. Bronze
Recent Comments