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Chemical Engineering - Mass Transfer

Exercise : Mass Transfer - Section 6
16.
Diameter of raschig rings used in packed tower in industry is normally around __________ inches.
2
8
12
18
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
The diffusion co-efficient in m2 /s. of acetic acid in benzene (liquid in liquid) is
2.09 x 10-4
2.09 x 10-5
2.09 x 10-9
2.09 x 10-12
Answer: Option
Explanation:
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18.
Pick out the wrong statement.
The Reynolds analogy for mass transfer is given by Lewis relation and is applicable, when Schmidt number is one.
Sherwood number for flow in pipes can be expressed as the ratio of the concentration gradient at wall to the overall concentration difference.
According to film theory for equimolar counter diffusion, the mass transfer coefficient is given by DAB(b)P - 3, Q - 2
The z-component of the total mass flux of a component A in binary mixture of A and B is given by - Dab'.dCA/dz.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
In case of non-ideal gases and liquids, the molal diffusivity
varies inversely as the pressure.
varies directly as the pressure.
is independent of pressure.
is equal to the volumetric diffusivity.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid )
p = P
p >>P
p < P
p << P
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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