Mechanical Engineering - Engineering Materials

46. 

When filing or machining cast iron makes our hands black, then it shows that __________ is present in cast iron.

A. cementite
B. free graphite

Answer: Option B

Explanation:

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47. 

According to Indian standard specifications, a plain carbon steel designated by 40 C8 means that the carbon content is

A. 0.04%
B. 0.35 to 0.45%
C. 0.4 to 0.6%
D. 0.6 to 0.8%

Answer: Option B

Explanation:

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48. 

Wrought iron

A. is a ductile material
B. can be easily forged or welded
C. cannot stand sudden and excessive shocks
D. all of these

Answer: Option D

Explanation:

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49. 

In iron, the presence of carbon in free form is called graphite.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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50. 

In a body centred cubic space lattice, there are nine atoms out of which eight atoms are located at the corners of the cube and one atom at its centre.

A. Yes
B. No

Answer: Option A

Explanation:

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