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Mass Transfer

Mass Transfer
The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around

1
0.24
3.97
600

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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.

Electrical resistance
Strength
None of the listed here
Thermal conductivity

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Mass Transfer
Very tall packed towers are divided into series of beds to

Reduce liquid hold-up
Avoid channelling
Reduce the overall pressure drop
Avoid flooding

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Mass Transfer
Make up water is supplied during cooling tower operation to compensate for water losses due to

All of these
Blowdown
Entrainment
Evaporation

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

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

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Mass Transfer
The solvent used in liquid-liquid extraction should have __________ less than one.

Neither A nor B
Selectivity
Both A & B
Distribution co-efficient

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