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Mass Transfer

Mass Transfer
According to Chilton-Colburn analogy for mass transfer, NSt.NSc2/3 is equal to

F/2
F
2f
1/f

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Mass Transfer
H₂S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H₂S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is

1
1.56
0.56
2

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Mass Transfer
_______ number indicates the ratio of the rates of the heat and mass transfer incase of a cooling tower.

Peclet
Stanton
Sherwood
Lewis

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Mass Transfer
Can the efficiency of a plate in the distillation tower be greater than 100%?

Yes
Never
Normally not; but is possible if infinite number of plates are put
Yes ; if the reflux ratio is maximum

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Mass Transfer
Capacity of a rotary dryer depends on its

Inclination with ground surface
None of the listed here
Both Inclination with ground surface & R.p.m
R.p.m

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Mass Transfer
The ratio of Murphree plate efficiency to point efficiency is always > 1 in a __________ flow model.

Both plug & perfectly mixed
Perfectly mixed
Plug
None of the listed here

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