CHEMICAL ENGINEERING

Question: __________ extractor uses centrifugal force for separating the two phases.
[A].

Treybal

[B].

Schiebel

[C].

Podbielniak

[D].

None of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: If the amount of the steam used in steam distillation is increased, the temperature of distillation
[A].

increases

[B].

decreases

[C].

remains unchanged

[D].

depends on relative volatility

Answer: Option B

Explanation:

No answer description available for this question.

Question: Dorr thickener is an equipment used for
[A].

classification

[B].

sedimentation

[C].

clarification

[D].

leaching

Answer: Option B

Explanation:

No answer description available for this question.

Question: The boiling points of pure components of a binary system __________ with increase in total pressure of the system.
[A].

decreases

[B].

increases

[C].

remains unchanged

[D].

may increase or decrease, depends on the system.

Answer: Option B

Explanation:

No answer description available for this question.

Question: JD factor for mass transfer is a function of Reynolds number. Mass transfer by molecular diffusion from a single drop to surrounding still air is given by
[A].

Nsh = 2

[B].

Nst = 2

[C].

Nsc = 2

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Laboratory determination of the dif-fusivity of vapor is done by __________ method.
[A].

wetted wall column

[B].

Gilliland’s

[C].

Winkel mann’s

[D].

Wike’s

Answer: Option C

Explanation:

No answer description available for this question.

Question: For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of __________ microns (1 mm = 1000 microns).
[A].

1-5

[B].

10-60

[C].

200-300

[D].

> 500

Answer: Option B

Explanation:

No answer description available for this question.

Question: In steam distillation, the
[A].

temperature is 100°C.

[B].

temperature is more than 100° C.

[C].

product must be immiscible with water.

[D].

temperature is higher than the boiling point of either component.

Answer: Option C

Explanation:

No answer description available for this question.

Question: If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that
[A].

the system comprises of partially mis-cible liquids.

[B].

the system comprises of miscible liquids.

[C].

the system comprises of an azeotrope.

[D].

on heating, a vapor phase will appear ; while on cooling, a solid phase will appear.

Answer: Option D

Explanation:

No answer description available for this question.

Question: Molecular distillation is
[A].

high temperature distillation

[B].

for heat-sensitive materials

[C].

very low pressure distillation

[D].

both (b) and (c)

Answer: Option D

Explanation:

No answer description available for this question.