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Mass Transfer

Mass Transfer
The fixed cost of a distillation column at minimum reflux ratio is

Optimum
Infinite
Minimum
None of these

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Mass Transfer
During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains constant.

Wet bulb temperature
Relative humidity
None of these
Partial pressure of water vapor

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Mass Transfer
At 750°K and 1 atm, the approximate value of Schmidt number for air is

10
0.1
0.01
1

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Mass Transfer
Make up water is supplied during cooling tower operation to compensate for water losses due to

Evaporation
All of these
Entrainment
Blowdown

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Mass Transfer
Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.

Size
Durability
Cost
Porosity

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Mass Transfer
The cooling effect in a cooling tower can not be increased by

Reducing the humidity of entering air
Increasing the air velocity over the wet surfaces
Lowering the barometric pressure
None of these

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