Mechanical Engineering - Engineering Materials

6. 

There are fourteen atoms in a unit cell of

A. body centred cubic space lattice
B. face centred cubic space lattice
C. close packed hexagonal space lattice
D. none of these

Answer: Option B

Explanation:

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7. 

The maximum internal diameter of a blast furnace is about

A. 3 m
B. 6 m
C. 9 m
D. 12 m

Answer: Option C

Explanation:

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8. 

In spheroidising process, the steel is

A. heated below the lower critical temperature and then cooled slowly
B. heated upto the lower critical temperature and then cooled in still air
C. heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
D. none of the above

Answer: Option C

Explanation:

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9. 

Pearlite is a combination of 87% ferrite and 13% cementite.

A. Yes
B. No

Answer: Option A

Explanation:

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10. 

The percentage carbon content in wrought iron is about

A. 0.02
B. 0.1
C. 02
D. 0.4

Answer: Option A

Explanation:

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