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
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.
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%

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Mass Transfer
Blowdown in a cooling tower

Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities
Is undesirable
All of these
Increases the scale forming tendencies of water

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Mass Transfer
Henry's law states that the

Partial pressure is equal to the product of the mole fraction and total pressure
Vapour pressure is equal to the product of the mole fraction and total pressure
Partial pressure of a component over a solution is proportional to the mole fraction in the vapour
Partial pressure of a component over a solution is proportional to its mole fraction in the liquid

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