Mechanical Engineering - Engineering Materials

21. 

Iron-carbon alloys containing 4.3% carbon are known as hypo-eutectic cast irons.

A. Correct
B. Incorrect

Answer: Option B

Explanation:

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22. 

The approximate height of a blast furnace is

A. 10 m
B. 20 m
C. 30 m
D. 40 m

Answer: Option C

Explanation:

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23. 

A steel alloy containing 36% nickel is called

A. stainless steel
B. high speed steel
C. invar
D. heat resisting steel

Answer: Option C

Explanation:

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24. 

The addition of manganese to aluminium improves corrosion resistance.

A. Correct
B. Incorrect

Answer: Option A

Explanation:

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25. 

The temperature point at which the change ends on heating the steel is called

A. lower critical point
B. upper critical point
C. point of recalescence
D. point of decalescence

Answer: Option B

Explanation:

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