Chemical Engineering - Mass Transfer

16. 

As the reflux ratio, in a continuous counter-current extraction is increased, the number of stages

A. increase
B. decrease
C. remain unchanged
D. can either increase or decrease, depends on the system

Answer: Option B

Explanation:

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17. 

In triangular co-ordinates, the ternery composition point falls __________ of the triangle.

A. in the corners
B. inside
C. on the sides
D. none of these.

Answer: Option B

Explanation:

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18. 

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:

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19. 

Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

A. (De.t)1/2
B. (De/t)1/2
C. (4Det)1/2
D. (4De/t)

Answer: Option C

Explanation:

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20. 

Reboiler is considered as one theoretical plate, because

A. of the assumption that vapour and liquid leaving the reboiler are in equilibrium.
B. vapour is recycled to the column.
C. reboiler itself contains one plate.
D. none of these.

Answer: Option A

Explanation:

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