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Mass Transfer

Mass Transfer
Surface renewal model of mass transfer was enunciated by

Fick
Stefan
Toor and Marchello
Danckwerts

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Mass Transfer
Which of the following increases during evaporative cooling process with recirculated water supply?

Relative humidity
Partial pressure of vapour
Both B and C
Wet bulb temperature

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Mass Transfer
Mass transfer co-efficient of liquid is

None of these
Affected much less by temperature than that for gases
Not affected by the temperature
Affected more by temperature than that for gases

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Mass Transfer
The humid volume may be increased by increasing the

Humidity at constant temperature
Neither A nor B
Temperature at constant humidity
Both A & B

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Mass Transfer
For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of Hâ‚‚/ky.Cz is around

0.24
0.6
1
0.72

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Mass Transfer
Which of the following employs an accessory known as 'drift eliminator' ?

Rotary dryer
Rotating disc contactor
Multiple effect evaporator
Mechanical draft cooling tower

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