Mechanical Engineering - Engineering Materials

16. 

When a low carbon steel is heated upto lower 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 A

Explanation:

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17. 

Grey cast iron is __________ than white cast iron.

A. softer
B. harder

Answer: Option A

Explanation:

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18. 

Corrosion resistance of steel is increased by adding nickel and chromium.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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19. 

The silicon steel is widely used for

A. connecting rods
B. cutting tools
C. generators and transformers in the form of laminated cores
D. motor car crankshafts

Answer: Option C

Explanation:

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20. 

Ball bearings are, usually, made from

A. low carbon steel
B. high carbon steel
C. medium carbon steel
D. chrome steel

Answer: Option D

Explanation:

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