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Mass Transfer

Mass Transfer
Surface renewal model of mass transfer was enunciated by

Fick
Toor and Marchello
Danckwerts
Stefan

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Mass Transfer
Which is the controlling factor for a drum drier?

Heat transfer
Neither A nor B
Both A & B
Diffusion

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Mass Transfer
Mass transfer co-efficient 'K' according to penetration theory varies with mass dif-fusivity as

D
1/D
D0.5
D1.5

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Mass Transfer
Which of the following employs an accessory known as 'drift eliminator' ?

Rotary dryer
Mechanical draft cooling tower
Rotating disc contactor
Multiple effect evaporator

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Mass Transfer
Which of the following is an undesirable characteristic for the solvent used in gas absorption?

Low vapor pressure
Low viscosity
None of these
High gas solubility

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Mass Transfer
For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause __________ plate requirement.

None of the listed here
No change in theoretical
Major decrease in the number of
Marginal decrease in the number of

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