Mass Transfer
Blowdown in a cooling tower

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

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Mass Transfer
Heat load in a cooling tower

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

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

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.
Rotary dryer is suitable for drying sticky material

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