Mass Transfer
Which of the following employs an accessory known as 'drift eliminator' ?

Rotary dryer
Rotating disc contactor
Multiple effect evaporator
Mechanical draft cooling tower

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Slope of the operating line in stripping section decreases
Number of plates decreases very slowly first and then more and more rapidly
Liquid flow increases while the vapor flow decreases for a system
Total cost first decreases and then increases

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