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Mass Transfer

Mass Transfer
The suitable evaporator for concentration of foaming liquids is a __________ evaporator.

Long tube
Short tube
Vacuum
Falling film

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

600
0.24
3.97
1

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Mass Transfer
Can a cooling tower cool water below the wet bulb temperature of inlet air?

No
Yes ; but the air flow rate should be excessively high
Yes
Yes ; but height of cooling tower will be prohibitively high

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Mass Transfer
In physical terms, Schmidt number means

Thermal diffusivity/momentum diffusivity
Thermal diffusivity/mass diffusivity
Momentum diffusivity/mass diffusivity
Mass diffusivity/thermal diffusivity

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Mass Transfer
On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in

Increased reboiler load
Increased reflux ratio
None of these
Greater degree of separation with a fixed number of trays

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Mass Transfer
Mass transfer co-efficient is directly proportional to DAB0.5, according to __________ theory.

Penetration
Film
Surface renewal
None of these

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