Mechanical Engineering - Engineering Materials

36. 

Silicon is added in low carbon steels to

A. make the steel tougher and harder
B. make the steel of good bending qualities
C. raise the yield point
D. all of these

Answer: Option A

Explanation:

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37. 

According to Indian standard specifications, cast iron designated by 'FG 150' means

A. white cast iron with B.H.N. 150
B. white cast iron with 150 MPa as minimum compressive strength
C. grey cast iron with B.H.N. 150
D. grey cast iron with 150 MPa as minimum tensile strength

Answer: Option D

Explanation:

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38. 

The red flame during the operation of a bessemer converter indicates that the

A. air is burning out silicon and manganese
B. silicon and manganese has burned out and carbon has started oxidising
C. converter must be tilted to remove the contents of the converter
D. red flame does not occur during the operation of a bessemer converter

Answer: Option D

Explanation:

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39. 

Phosphor bronze has

A. high resistance to corrosion
B. good wearing qualities and high elasticity
C. valuable cold working property
D. all of these

Answer: Option B

Explanation:

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40. 

In the austempering process of heat treatment, austenite changes into

A. martensite
B. troostite
C. sorbite
D. bainite

Answer: Option D

Explanation:

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