Chemical Engineering Basics

Question: The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler.
[A].

evaporative capacity

[B].

evaporation efficiency

[C].

thermal efficiency

[D].

steam load

Answer: Option A

Explanation:

No answer description available for this question.

Question: Draught produced by a tall chimney due to density difference between hot flue gas inside the Chimney and atmospheric air outside the chimney is more appropriately known as the __________ draught.
[A].

natural

[B].

induced

[C].

forced

[D].

chimney

Answer: Option A

Explanation:

No answer description available for this question.

Question: Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by
[A].

conduction

[B].

convection

[C].

both ‘a’ & ‘b’

[D].

radiation

Answer: Option D

Explanation:

No answer description available for this question.

Question: Which of the following relatively employs the highest heat transfer surface area in a high pressure boiler ?
[A].

Airpreheater

[B].

Economiser

[C].

Steam superheater

[D].

Furnace water wall

Answer: Option A

Explanation:

No answer description available for this question.

Question: A balanced draught boiler furnace employs __________ draught fan.
[A].

induced

[B].

forced

[C].

both ‘a’ & ‘b’

[D].

neither ‘a’ nor ‘b’

Answer: Option C

Explanation:

No answer description available for this question.

Question: Function of blow down valve in a boiler is to
[A].

maintain the drum level.

[B].

keep the drum pressure constant.

[C].

drain out the sludge from the drum.

[D].

empty the boiler during shutdown.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Copper is not present as an alloying constituent in
[A].

silicon bronze

[B].

constantan

[C].

nichrome

[D].

delta metal

Answer: Option C

Explanation:

No answer description available for this question.

Question: 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:

No answer description available for this question.

Question: Which of the following processes follows the hardening process for reducing the hardening strains & increasing the toughness of the steel part?
[A].

Anodising

[B].

Tempering

[C].

Carburising

[D].

Annealing

Answer: Option B

Explanation:

No answer description available for this question.

Question: Normalising of an object does not
[A].

refine coarse grain structure obtained during hot working.

[B].

improve ductility.

[C].

improve yield strength.

[D].

improve machanical properties.

Answer: Option B

Explanation:

No answer description available for this question.