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Mass Transfer

Mass Transfer
Diameter to height ratio for a rashig ring is

2
5
1
0.5

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Mass Transfer
In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at __________ reflux.

Total
Maximum permissible
Minimum
Operating

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Mass Transfer
When the temperature and humidity of air is low, we usually use __________ draft cooling tower.

Forced
None of these
Induced
Natural

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

2f
F
F/2
1/f

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Mass Transfer
For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same.

Both A & B
Unsaturated surface
Constant rate
Neither A nor B

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Mass Transfer
'ADDUCTS' and 'CLATHRATES' are used in case of

Extractive distillation
None of these
Absorption
Crystallisation

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