Mass Transfer

Question: Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture.
[A].

unbound

[B].

critical

[C].

free

[D].

bound

Answer: Option A

Explanation:

No answer description available for this question.

Question: Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the __________ moisture.
[A].

bound

[B].

unbound

[C].

critical

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Calcium ammonium nitrate (a fertiliser) is dried in a __________ dryer.
[A].

rotary

[B].

vacuum

[C].

tunnel

[D].

tray

Answer: Option A

Explanation:

No answer description available for this question.

Question: Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the __________ moisture.
[A].

free

[B].

unbound

[C].

equilibrium

[D].

bound

Answer: Option C

Explanation:

No answer description available for this question.

Question: In paper industry, paper is dried in a __________ dryer.
[A].

tunnel

[B].

heated cylinder

[C].

conveyor

[D].

festoon

Answer: Option B

Explanation:

No answer description available for this question.

Question: Detergent solution is dried to a powder in a
[A].

spray dryer

[B].

spouted bed dryer

[C].

tunnel dryer

[D].

pan open to atmosphere

Answer: Option A

Explanation:

No answer description available for this question.

Question: Equilibrium-moisture curves of different solids
[A].

are different

[B].

are same

[C].

depend on the humidity of the gas

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Milk is dried usually in a __________ dryer.
[A].

freeze

[B].

spray

[C].

tray

[D].

rotary

Answer: Option B

Explanation:

No answer description available for this question.

Question: Critical humidity of a solid salt means the humidity
[A].

above which it will always become damp.

[B].

below which it will always stay dry.

[C].

both (a) and (b).

[D].

above Which it will always become dry and below which it will always stay damp.

Answer: Option C

Explanation:

No answer description available for this question.

Question: The caking of crystals can be prevented by
[A].

maintaining high critical humidity.

[B].

maintaining low critical humidity.

[C].

coating the product with inert material.

[D].

both (a) and (c)

Answer: Option D

Explanation:

No answer description available for this question.