CHEMICAL ENGINEERING

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.

Question: __________ is concerned with the adsorption equilibria.
[A].

Fick’s law

[B].

Gibb’s equation

[C].

Freundlich equation

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: A minimum boiling azeotrope is exemplified by
[A].

toluene-benzene

[B].

acetone-carbon disulphide

[C].

water-isobutyl alcohol

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: During constant rate drying period, vaporisation rate per unit drying surface area
[A].

decreases with time.

[B].

increases with time.

[C].

does not change with time,

[D].

does not affect the moisture content of the wet solid.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Bound moisture is that liquid which exerts an equilibrium vapor pressure __________ that of the pure liquid at the given temperature.
[A].

less than

[B].

more than

[C].

equal to

[D].

either (o) or (b); depends on the solid

Answer: Option A

Explanation:

No answer description available for this question.