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Mass Transfer

Component A is diffusing in a medium B. The flux NA relative to a stationary point is equal to the flux due to molecular difusion, if

CHEMICAL ENGINEERING, Mass Transfer /
Question: Component A is diffusing in a medium B. The flux NA relative to a stationary point is equal to the flux due to molecular difusion, if
[A].

mass transfer is accompanied by reaction.

[B].

diffusion of A is in stagnant medium B.

[C].

molecular mean free path is high.

[D].

there is equimolar counter diffusion.

Answer: Option D

Explanation:

No answer description available for this question.

Component A is diffusing in a medium B. The flux NA relative to a stationary point is equal to the flux due to molecular difusion, if Read More »

CHEMICAL ENGINEERING, Mass Transfer

It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).

CHEMICAL ENGINEERING, Mass Transfer /
Question: It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).
[A].

15 min

[B].

51 min

[C].

71 min

[D].

94 min

Answer: Option C

Explanation:

No answer description available for this question.

It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%). Read More »

CHEMICAL ENGINEERING, Mass Transfer

According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B ? Assume that relative volatility (αAB = 2) does not change appreciably in the coloumn.

CHEMICAL ENGINEERING, Mass Transfer /
Question: According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B ? Assume that relative volatility (αAB = 2) does not change appreciably in the coloumn.
[A].

5

[B].

9

[C].

12

[D].

28

Answer: Option C

Explanation:

No answer description available for this question.

According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B ? Assume that relative volatility (αAB = 2) does not change appreciably in the coloumn. Read More »

CHEMICAL ENGINEERING, Mass Transfer

In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raf-finate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg)

CHEMICAL ENGINEERING, Mass Transfer /
Question: In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raf-finate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg)
[A].

6.89

[B].

8.89

[C].

10

[D].

8.25

Answer: Option B

Explanation:

No answer description available for this question.

In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raf-finate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg) Read More »

CHEMICAL ENGINEERING, Mass Transfer

An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is

CHEMICAL ENGINEERING, Mass Transfer /
Question: An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is
[A].

9.21

[B].

4.605

[C].

100

[D].

0.001

Answer: Option B

Explanation:

No answer description available for this question.

An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is Read More »

CHEMICAL ENGINEERING, Mass Transfer

A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m-xylene (all percentages in w/w). Which of the following statements would be true in respect of this mixture?

CHEMICAL ENGINEERING, Mass Transfer /
Question: A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m-xylene (all percentages in w/w). Which of the following statements would be true in respect of this mixture?
[A].

The mixture exhibits an azeotrope at 101.3 kPa.

[B].

The composition of the mixture, in percent by volume is: o-xylene 30, p-xylene 60. and m-xylene 10.

[C].

The composition of the mixture in mole percent is: o-xylene 30, p-xylene 60 and m-xyoene 10.

[D].

The mixture contain optical isomers.

Answer: Option A

Explanation:

No answer description available for this question.

A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m-xylene (all percentages in w/w). Which of the following statements would be true in respect of this mixture? Read More »

CHEMICAL ENGINEERING, Mass Transfer

One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult’s law is obeyed, then changing the feed composition would effect

CHEMICAL ENGINEERING, Mass Transfer /
Question: One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult’s law is obeyed, then changing the feed composition would effect
[A].

the product composition but not the fraction vaporised.

[B].

the product composition as well as the fraction vaporised.

[C].

the fraction vaporised but not the product composition.

[D].

neither the product composition nor the fraction vaporised.

Answer: Option C

Explanation:

No answer description available for this question.

One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult’s law is obeyed, then changing the feed composition would effect Read More »

CHEMICAL ENGINEERING, Mass Transfer