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Mass Transfer

Mass Transfer
If moisture content of solid on dry basis is X, then the same on wet basis is

X/(X - 1)
X/(X + 1)
(X + 1)/X
(X - 1)/X

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Mass Transfer
Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the __________ moisture.

Bound
Equilibrium
Unbound
Free

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Mass Transfer
The critical moisture content in case of drying indicates the __________ rate period.

Beginning of constant
None of these
Beginning of falling
End of falling

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Mass Transfer
Batch tray dryers suffers from the disadvantage of

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

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Mass Transfer
With increase in pressure, the relative volatility for a binary system

Remains same
Decreases
Increases
Either A or B, depends on the system

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Mass Transfer
For the same system, if the same liquid used in an absorber is decreased, the tower height will

Decrease
Increase
Decrease or increase ; depends on the type of liquid
Remain unaffected

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