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Mass Transfer

Mass Transfer
If f = moles of vapour present per mole of feed, then the slope of feed line is

(1 - f)/f
- 1/f
- f/(1 - f)
- (f - 1)/f

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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
Decreases
Remains same
Increases linearly

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Mass Transfer
At 750°K and 1 atm, the approximate value of Schmidt number for air is

10
0.01
1
0.1

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Mass Transfer
In distillation column design, the McCabe-Thiele procedure is inadequate and a Ponchan-Savarit procedure is needed, when

A total condenser is used
Saturated feed is not used
An azeotrope forms
The latent heat of vaporisation of the more and less volatile components are greatly different

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Mass Transfer
Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the __________ of a fibre.

Strength
None of the listed here
Thermal conductivity
Electrical resistance

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Mass Transfer
The most common packing used in industrial operations is __________ rings.

Single spiral
Cross-partition
Lessing
Raschig

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