Chemical Engineering - Chemical Engineering Basics

11. 

Oxide layer formed on the non-ferrous metal surface after its annealing is

A. removed by acid pickling.
B. hammered into the surface.
C. removed with coarse emery cloth.
D. left as such to protect the surface.

Answer: Option A

Explanation:

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12. 

Silicon percentage in silicon steel used for electrical equipments is about

A. 1
B. 4.0
C. 8
D. 14

Answer: Option B

Explanation:

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13. 

Catalyst used in the 'catalytic converter' employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is

A. alumina
B. platinum
C. vanadium pentoxide
D. iron oxide

Answer: Option B

Explanation:

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14. 

Liquid nitrogen containers can be made from

A. ferritic stainless steel
B. HSLA steel
C. titanium
D. austenitic stainless steel

Answer: Option B

Explanation:

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15. 

Materials having __________ lattice structure are usually the most ductile.

A. body centred cubic (bcc)
B. hexagonal close packed (hcp)
C. face centred cubic (fcc)
D. none of these

Answer: Option C

Explanation:

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