Mass Transfer

Question: Dimension of mass diffusivity is the same as that of
[A].

kinematic viscosity

[B].

dynamic viscosity

[C].

surface tension

[D].

pressure

Answer: Option A

Explanation:

No answer description available for this question.

Question: In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at __________ reflux.
[A].

total

[B].

minimum

[C].

operating

[D].

maximum permissible

Answer: Option A

Explanation:

No answer description available for this question.

Question: During the constant rate period of drying of a solid,
[A].

increased air humidity decreases the rate of drying.

[B].

increasing the air temperature decreases the drying rate.

[C].

surface evaporation of unbound moisture occurs.

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Dry bulb temperature of the gas is __________ the wet bulb temperature.
[A].

less than

[B].

more than

[C].

equal to

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Gaseous diffusivity at atmospheric pressure is of the order of __________ cm2/second.
[A].

1

[B].

1 to 5

[C].

5 to 10

[D].

> 10

Answer: Option A

Explanation:

No answer description available for this question.

Question: At __________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation.
[A].

operating

[B].

total

[C].

minimum

[D].

maximum permissible

Answer: Option B

Explanation:

No answer description available for this question.

Question: Large scale drying of sugar is done in a __________ dryer.
[A].

spouted bed

[B].

tray

[C].

rotary

[D].

truck

Answer: Option C

Explanation:

No answer description available for this question.

Question: __________ is the separation technique used for desalination of sea water.
[A].

Thermal diffusion

[B].

Reverse osmosis

[C].

Adsorption

[D].

absorption

Answer: Option B

Explanation:

No answer description available for this question.

Question: Liquid diffusivity is of the order of __________ cm2 /second.
[A].

0.01

[B].

0.1

[C].

10-5 to 10-6

[D].

> 1

Answer: Option C

Explanation:

No answer description available for this question.

Question: Danckwerts developed the __________ theory.
[A].

penetration

[B].

surface renewal

[C].

film

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.