Chemical Engineering - Materials and Construction

1.
'Age hardening' of duralumin is due to
copper
magnesium
both (a) & (b)
neither (a) nor (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.

2.
__________ is a donor impurity for semi-conductors.
Boron
Antimony
Gallium
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.

3.
Post weld heat treatment is done by
normalising
stress relieving
tempering
solution annealing
Answer: Option
Explanation:
No answer description is available. Let's discuss.

4.
How many atoms are there per unit cell in a body centred cubic lattice system ?
2
3
4
6
Answer: Option
Explanation:
No answer description is available. Let's discuss.

5.
Presence of cobalt in steel improves its
cutting ability
corrosion resistance
tensile strength
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.