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MASS TRANSFER

Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the pressure (P) as

D ∝ 1/P
D ∝ 1/P0.5
D ∝ P0.5
D ∝ 1/P1.5

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Mass Transfer
Which of the following same diameter columns gives lowest pressure drop per unit height?

Randomly packed column
Packed column (stacked)
Bubble-cap column
Sieve-plate column

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Mass Transfer
Reverse osmosis is also called

Ultrafiltration
Electrodilysis
Diffusion
Dialysis

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Mass Transfer
Heat sensitive materials like certain pharmaceuticals and food stuffs can be dried in a/an __________ dryer.

None of these
Indirect tray
Freeze
Spray

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

D1.5
D0.5
D
1/D

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