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Mass Transfer

Mass Transfer
Sticky material can be dried in a __________ dryer.

Fluidised bed
Tray
Rotary
None of these

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Mass Transfer
The drying time between fixed moisture content within diffusion controlled 'falling rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )

T³
T²
T
√T

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Mass Transfer
In case of gases, the binary diffusivity is proportional to (where, P = pressure)

√P
1/√P
1/P
P

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Mass Transfer
In a distillation column, with increase in the reflux ratio, the heat removed in the cooler

Increases
Remains unaffected
Decreases
And the heat required in reboiler decreases

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Mass Transfer
__________ temperature is the steady state temperature attained by a small amount of liquid evaporating into a large quantity of unsaturated gas-vapor mixture.

Wet bulb
Dew point
None of these
Dry bulb

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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.

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

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