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Mass Transfer

Mass Transfer
If moisture content of solid on dry basis is X, then the same on wet basis is

X/(X + 1)
(X + 1)/X
(X - 1)/X
X/(X - 1)

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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

1.04
0.54
1.94
1.24

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Mass Transfer
Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C?

Humidification only
Evaporative cooling
Both heating and humidification
Heating only

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Mass Transfer
Dry bulb temperature of unsaturated air is more than its __________ temperature.

Both A & B
Neither A nor B
Wet bulb
Dew point

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Mass Transfer
Prandtl number for water at 20°C is about

150
7
0.7
70

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Mass Transfer
__________ columns are used for liquid dispersion in a continuous gas phase.

Bubble cap
Pulse
Sieve plate
Packed

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