Mass Transfer
Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C?

Heating only
Both heating and humidification
Humidification only
Evaporative cooling

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Mass Transfer
Bollman extractor

Is a static bed leaching equipment
Is a centrifugal extractor
Employs only counter-current extraction
Is used for extraction of oil from oilseed

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