Mass Transfer
Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the __________ of a fibre.

None of the listed here
Electrical resistance
Thermal conductivity
Strength

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Mass Transfer
Heat load in a cooling tower

Neither A nor B
Is equal to the number of kg, of water circulated times the cooling range
Both A & B
Means the amount of heat thrown away (KCal/hr.) by the cooling tower

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Mass Transfer
McCabe-Thiele method

Uses weight fractions to express liquid and vapour composition
Is more accurate than Ponchan-Savarit method
Uses molal units for material and energy balance
Can use any type of units

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Mass Transfer
Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when

Only liquid phase obeys Dalton's law
Only vapor phase follows Raoult's law
Liquid phase obeys Dalton's law and vapor phase obeys Raoult's law
Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law

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