Mechanical Engineering - Engineering Materials

36. 

The ratio of the volume occupied by the atoms to the total volume of the unit cell is called

A. coordination number
B. atomic packing factor
C. space lattice
D. none of these

Answer: Option B

Explanation:

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37. 

Which of the following statement is incorrect about duralumin?

A. It is prone to age hardening
B. It can be forged
C. It has good machining properties
D. It is lighter than pure aluminium

Answer: Option D

Explanation:

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38. 

The property of a material which enables it to retain the deformation permanently, is called

A. brittleness
B. ductility
C. malleability
D. plasticity

Answer: Option D

Explanation:

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39. 

Sulphur 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 B

Explanation:

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40. 

Cementite consist of

A. 13% carbon and 87% ferrite
B. 13% cementite and 87% ferrite
C. 13% ferrite and 87% cementite
D. 6.67% carbon and 93.33% iron

Answer: Option D

Explanation:

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