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Mass Transfer

Mass Transfer
Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as

K ∝ √D
K ∝ D1.5
K ∝ D2
K ∝ D

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Mass Transfer
On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in

Increased reflux ratio
None of these
Greater degree of separation with a fixed number of trays
Increased reboiler load

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Mass Transfer
Chemisorption (chemical adsorption) is

An irreversible phenomenon
Same as "Van der Waals" adsorption
Characterised by adsorption of heat
A reversible phenomenon

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Mass Transfer
Which of the following is used for the concentration of rubber latex?

Calendria
Long tube vertical evaporator
Agitated film evaporator
Short tube evaporator

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Mass Transfer
Which of the following is not a batch drier?

Fluidised bed drier
Truck drier
Agitated pan drier
Vacuum shelf drier

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Mass Transfer
A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?

Temperature of the solid
Flow rate of inlet air
Humidity of inlet air
Relative humidity of outlet air

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