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Mass Transfer

Mass Transfer
Desirable value of absorption factor in an absorber is

> 1
1
< 1
0.5

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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)

1000
100
500
50

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Mass Transfer
In case of gases, the binary diffusivity is proportional to (where, P = pressure)

P
1/P
1/√P
√P

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Mass Transfer
With increase in pressure, the relative volatility for a binary system

Decreases
Remains same
Increases
Either A or B, depends on the system

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Mass Transfer
The value of L/mG ratio for economical absorption operation ranges from

2.5 to 3.5
1.25 to 2.0
0.8 to 1.2
0.5 to 0.8

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Mass Transfer
In case of unsaturated air

None of the listed here
Both of the options given here
Wet bulb temperature < dry bulb temperature
Dew point < wet bulb temperature

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MORE MCQ ON Mass Transfer

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