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Mass Transfer

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

Rotary
Truck
Tray
Spouted bed

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Mass Transfer
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Re0.83
Re0.53
Re0.33
Re

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Mass Transfer
Can the efficiency of a plate in the distillation tower be greater than 100%?

Yes ; if the reflux ratio is maximum
Normally not; but is possible if infinite number of plates are put
Never
Yes

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Mass Transfer
The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m²/m³)

500
1000
100
50

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Mass Transfer
A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is

1.24
0.54
1.94
1.04

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Mass Transfer
Azeotropism for ethyl alcohol-water system disappears by

Decreasing pressure
Increasing pressure
No means
Increasing temperature

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