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Mass Transfer

Mass Transfer
Calcium ammonium nitrate (a fertiliser) is dried in a __________ dryer.

Tunnel
Tray
Rotary
Vacuum

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

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

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Mass Transfer
Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the __________ number.

Peclet
Sherwood
Stanton
Schmidt

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Mass Transfer
Moisture contained by a substance in excess of the equilibrium moisture is called the __________ moisture.

Free
Critical
Unbound
Bound

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Mass Transfer
Unit of molal diffusivity is

Cm²/sec gm . mole
Gm moles/cm². sec
Gm moles/cm² . sec
Gm moles/cm. sec

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Mass Transfer
The caking of crystals can be prevented by

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

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