Chemical Engineering - Materials and Construction

1. 

'Age hardening' of duralumin is due to

A. copper
B. magnesium
C. both (a) & (b)
D. neither (a) nor (b)

Answer: Option C

Explanation:

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2. 

__________ is a donor impurity for semi-conductors.

A. Boron
B. Antimony
C. Gallium
D. none of these

Answer: Option B

Explanation:

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3. 

Post weld heat treatment is done by

A. normalising
B. stress relieving
C. tempering
D. solution annealing

Answer: Option B

Explanation:

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4. 

How many atoms are there per unit cell in a body centred cubic lattice system ?

A. 2
B. 3
C. 4
D. 6

Answer: Option A

Explanation:

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5. 

Presence of cobalt in steel improves its

A. cutting ability
B. corrosion resistance
C. tensile strength
D. none of these

Answer: Option A

Explanation:

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