Mechanical Engineering - Engineering Materials

31. 

The brown smoke during the operation of a bessemer Converter indicates that the

A. air is burning out silicon and managanese
B. silicon and manganese has burnt and carbon has started oxidising
C. the converter must be titled to remove the contents of the converter
D. the brown smoke does not occur during the operation of a bessemer converter

Answer: Option A

Explanation:

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32. 

Martensite has needle like structure and is magnetic.

A. Correct
B. Incorrect

Answer: Option A

Explanation:

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33. 

Monel metal is an alloy of

A. nickel and copper
B. nickel and chromium
C. nickel, chromium and iron
D. copper and chromium

Answer: Option A

Explanation:

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34. 

In induction hardening, the depth of hardening is controlled by controlling the voltage.

A. Correct
B. Incorrect

Answer: Option A

Explanation:

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35. 

The austenite is a solid solution of carbon or iron carbide in gamma-iron.

A. Correct
B. Incorrect

Answer: Option A

Explanation:

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