Mechanical Engineering - Engineering Materials

6. 

In a unit cell of a body centred cubic space lattice, there are __________ atoms.

A. six
B. nine
C. fourteen
D. seventeen

Answer: Option B

Explanation:

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7. 

Cast iron has

A. high compressive strength
B. excellent machinability
C. good casting characteristic
D. all of these

Answer: Option D

Explanation:

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8. 

The nuts and bolts are made from silicon steel.

A. Correct
B. Incorrect

Answer: Option B

Explanation:

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9. 

Silicon in cast iron

A. makes the iron soft and easily machinable
B. increases hardness and brittleness
C. makes the iron white and hard
D. aids fusibility and fluidity

Answer: Option A

Explanation:

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10. 

The process which improves the machinability of steels, but lowers the hardness and tensile strength, is

A. normalising
B. full annealing
C. process annealing
D. spheroidising

Answer: Option D

Explanation:

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