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Chemical Engineering - Mass Transfer

Exercise : Mass Transfer - Section 14
16.
As the reflux ratio, in a continuous counter-current extraction is increased, the number of stages
increase
decrease
remain unchanged
can either increase or decrease, depends on the system
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
In triangular co-ordinates, the ternery composition point falls __________ of the triangle.
in the corners
inside
on the sides
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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)
6.89
8.89
10
8.25
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)
(De.t)1/2
(De/t)1/2
(4De/πt)1/2
(4De/t)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
Reboiler is considered as one theoretical plate, because
of the assumption that vapour and liquid leaving the reboiler are in equilibrium.
vapour is recycled to the column.
reboiler itself contains one plate.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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