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Mass Transfer

Mass Transfer
In paper industry, paper is dried in a __________ dryer.

Conveyor
Heated cylinder
Tunnel
Festoon

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Mass Transfer
HETP is numerically equal to HTU, only when the operating line

Is far from the equilibrium line
Lies above the equilibrium line
Lies below the equilibrium line
And equilibrium lines are parallel

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Mass Transfer
High pressure at the bottom of a distillation tower handling heat sensitive materials results in

Increased relative volatility
Erosion of the tower
Thermal decomposition of bottoms
Very efficient operation

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Mass Transfer
To remove all the moisture from a wet solid it requires exposure to __________ air.

Perfectly dry
None of these
High temperature
Highly humid

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Mass Transfer
With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________ , if the conduction and radiation through the solid are negligible.

Increases linearly
Remains same
Decreases
Increases

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Mass Transfer
The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m²/m³)

50
500
1000
100

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