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Mass Transfer

Mass Transfer
Large scale drying of wheat is done in a __________ dryer.

Tray
Spouted bed
Fluidised bed
Vacuum rotary

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

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

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Mass Transfer
The most economical range of absorption factor is

2 to 2.5
1.25 to 2
2.5 to 3
5 to 10

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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
Spray
Indirect tray
Freeze

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Mass Transfer
For the same process conditions, the reflux ratio of an unlagged distillation column

Decreases in winter
None of these
Increases in summer
Increases in winter

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Mass Transfer
Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )

(1 - Ri) = Ro/Ri
(1 + Ro) = Ro/Ri
(1 + Ri) = Ro/Ri
(1 - Ro) = Ro/Ri

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