Mass Transfer
Which of the following increases during evaporative cooling process with recirculated water supply?

Partial pressure of vapour
Wet bulb temperature
Relative humidity
Both B and C

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Mass Transfer
Pick out the wrong statement pertaining to the rotary dryer.

Rotary dryer is suitable for drying sticky material
Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute
Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12%
Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.

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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

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

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