Mass Transfer
Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture.

Bound
Critical
Free
Unbound

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Mass Transfer
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because

Solubility of the components of air in water is very small
Water has a high latent heat of evaporation
They are always equal under all circumstances
Lewis number is close to unity

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Mass Transfer
In case of an absorber, the operating

Line always lies below the equilibrium curve
Line always lies above the equilibrium curve
Line can be either above or below the equilibrium curve
Velocity is more than the loading velocity

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