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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
Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C?

Evaporative cooling
Heating only
Humidification only
Both heating and humidification

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Mass Transfer
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as

Ri = Re/(1 - Re)
Ri = Re
Ri = (1 - Re)/Re
Ri = Re/(1 + Re)

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Mass Transfer
Agitator is provided in a crystalliser for

Avoiding deposition on cooler surfaces
Crystal growth
Formation of nuclei
All of these

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Mass Transfer
Only small amount of evaporation of water produces large cooling effects because of its

Small latent heat
Low viscosity
None of these
Large latent heat

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Mass Transfer
In physical terms, Schmidt number means

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

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