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Mass Transfer

Mass Transfer
At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes

?
None of these
1

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Mass Transfer
The Schmidt number which is defined as, μ/ρ D, is the ratio of the

Momentum diffusivity to the mass dif-fusivity
Momentum diffusivity to the thermal diffusivity
None of these
Thermal diffusivity to the mass diffusivity

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Mass Transfer
Reboiler is considered as one theoretical plate, because

Of the assumption that vapour and liquid leaving the reboiler are in equilibrium
Vapour is recycled to the column
None of these
Reboiler itself contains one plate

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Mass Transfer
Make up water is required in a cooling tower to replace the water lost by

Evaporation
Blowdown and leakage
All of these
Drift

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Mass Transfer
When the psychometric ratio is __________ then the adiabatic saturation temperature and wet bulb temperature becomes equal.

1
< 1
?
> 1

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Mass Transfer
In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

< 8 : 1
< 6:1
> 4 :1
> 8:1

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