Mass Transfer
Desulphurisation of petrol is done in a

Plate type extraction column
Bollman extractor
Rotating disc extractor
Packed extraction column

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Mass Transfer
In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads? Reflux conditions:(i) Reflux stream is completely liquid and is at its bubble point.(ii) Reflux stream is below its bubble point.

Condenser and reboiler loads are the same in both the cases
Both condensor and reboiler loads are higher in case (ii) as compared to case (i)
Condenser load is the same in both the cases but reboiler load is higher in case (ii)
Reboiler load is the same in both the cases but condenser load is higher in case (ii)

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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
Both A & B
Means the amount of heat thrown away (KCal/hr.) by the cooling tower
Neither A nor B

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