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Mass Transfer

Mass Transfer
Wet bulb and dry bulb temperatures becomes identical at __________ percent saturation curve.

50
None of these
78
100

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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?

Both heating and humidification
Evaporative cooling
Heating only
Humidification only

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Mass Transfer
The caking of crystals can be prevented by

Both A and C
Maintaining high critical humidity
Coating the product with inert material
Maintaining low critical humidity

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Mass Transfer
For continuous drying of grannular or crystalline material, the dryer used is the __________ dryer.

Tray
None of these
Tunnel
Rotary

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Mass Transfer
Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of

Momentum diffusivity to thermal diffusivity
Mass diffusivity to momentum diffusivity
Thermal diffusivity to mass diffusivity
None of these

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Mass Transfer
In case of unsaturated air

Wet bulb temperature < dry bulb temperature
Dew point < wet bulb temperature
Both of the options given here
None of the listed here

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