Mechanical Engineering - Engineering Materials

36. 

Which of the following display properties similar to that of steel?

A. Blackheart cast iron
B. Whiteheart cast iron
C. both (a) and (b)
D. none of these

Answer: Option C

Explanation:

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37. 

Hindalium is an alloy of aluminium and magnesium with a small quantity of chromium.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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38. 

When a low carbon steel is heated upto upper critical temperature

A. there is no change in grain size
B. the average grain size is a minimum
C. the grain size increases very rapidly
D. the grain size first increases and then decreases very rapidly

Answer: Option B

Explanation:

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39. 

The steel widely used for motor car crankshafts is

A. nickel steel
B. chrome steel
C. nickel-chrome steel
D. silicon steel

Answer: Option B

Explanation:

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40. 

Combined carbon in iron makes the metal

A. soft and gives coarse grained crystalline structure
B. soft and gives a fine grained crystalline structure
C. hard and gives a coarse grained crystalline structure
D. hard and gives a fine grained crystalline structure

Answer: Option D

Explanation:

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