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Mass Transfer

Mass Transfer
__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.

Bubble
Spray
Packed
Tray

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Mass Transfer
A mixture of 10% C₆H₆ vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around __________ °C.

20
21.7
18.7
27.3

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

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

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Mass Transfer
For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of __________ microns (1 mm = 1000 microns).

200-300
22190
> 500
43835

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Mass Transfer
If the specific heats of a gas and a vapor are 0.2KJ/Kg.°K and 1.5 KJ/Kg.°K respectively, and the humidity is 0.01; the humid heat in KJ/°Kg. is

0.215
0.017
0.107
0.31

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Mass Transfer
Surface renewal model of mass transfer was enunciated by

Toor and Marchello
Stefan
Fick
Danckwerts

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