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Mass Transfer

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

Rotary
Tunnel
None of these
Tray

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Mass Transfer
Weeping in a distillation column

Provides large interfacial surface for mass transfer
Increases tray efficiency
Results due to very low gas velocity
Results due to very high gas velocity

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Mass Transfer
The-relative volatility for separation of a non-ideal binary mixture by distillation should be

> 1
1
< 1

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Mass Transfer
What is the reflux ratio at total reflux?

Zero
Infinity
Unity
Data insufficient

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Mass Transfer
Batch tray dryers suffers from the disadvantage of

High maintenance cost
High labour cost & low heat economy
Non-uniform & low production rate
All of the listed here

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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.

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

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