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Mass Transfer

Mass Transfer
An azeotropic mixture is a __________ mixture.

Ternary
None of these
Constant boiling point
Binary

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Mass Transfer
Drying operation under vacuum is carried out to

Dry materials having high bound moisture content
Reduce drying temperature
Increase drying temperature
Dry those materials which have very high unbound mositure content

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Mass Transfer
The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will

Decrease
Remains same
Increase
Depend on saturated boiling point; may increase or decrease

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Mass Transfer
A slurry is to be dried to produce flaky solid. Which dryer would you recommend?

Spray dryer
Rotary dryer
Drum dryer
Dielectric dryer

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Mass Transfer
In a counter-current extractor, as the axial mixing increases, the extraction efficiency

Remains unchanged
Decreases
Increases
Depends on the pressure of the system

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Mass Transfer
Batch tray dryers suffers from the disadvantage of

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

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