Chemical Engineering

Question: Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant
[A].

humidity

[B].

velocity

[C].

temperature

[D].

all (a), (b) & (c)

Answer: Option D

Explanation:

No answer description available for this question.

Question: In extractive distillation, solvent is
[A].

added to alter the relative volatility of the mixture.

[B].

of high volatility.

[C].

present in overhead stream.

[D].

of high viscosity to give high tray efficiency.

Answer: Option A

Explanation:

No answer description available for this question.

Question: A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.
[A].

10-15

[B].

30-40

[C].

70-80

[D].

90-100

Answer: Option A

Explanation:

No answer description available for this question.

Question: During drying operation, it is easier to remove the __________ moisture.
[A].

equilibrium

[B].

critical

[C].

unbound

[D].

bound

Answer: Option C

Explanation:

No answer description available for this question.

Question: Azeotropism for ethyl alcohol-water system disappears by
[A].

increasing temperature

[B].

decreasing pressure

[C].

increasing pressure

[D].

no means

Answer: Option B

Explanation:

No answer description available for this question.

Question: Alcohol is dehydrated using __________ distillation.
[A].

extractive

[B].

azeotropic

[C].

steam

[D].

molecular

Answer: Option B

Explanation:

No answer description available for this question.

Question: Adsorption is an unit operation which generally involves __________ systems.
[A].

liquid-solid

[B].

gas-solid

[C].

fluid-solid

[D].

solid-solid

Answer: Option C

Explanation:

No answer description available for this question.

Question: Mechanism of moisture removal in case of freeze drying of food stuff is by
[A].

evaporation

[B].

sublimation

[C].

dehydration

[D].

adsorption

Answer: Option B

Explanation:

No answer description available for this question.

Question: A plait point is the point on the solubility curve, where the tie line reduces to a point. What is the number of plait point for a ternery system containing twopairs of partially miscible liquids ?
[A].

0

[B].

1

[C].

2

[D].

3

Answer: Option A

Explanation:

No answer description available for this question.

Question: Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the
[A].

high evaporation losses of water.

[B].

high pressure drop of the gas.

[C].

difficulty in its fabrication.

[D].

none of these.

Answer: Option B

Explanation:

No answer description available for this question.