Mass Transfer
One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult's law is obeyed, then changing the feed composition would effect

The product composition as well as the fraction vaporised
The product composition but not the fraction vaporised
The fraction vaporised but not the product composition
Neither the product composition nor the fraction vaporised

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Mass Transfer
Heat load in a cooling tower

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

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Mass Transfer
When the solvent dissolves very little of solute, then

Large quantity of solvent is required to extract the solute
Solvent of low latent heat of vaporisation should be used
Solvent of low freezing point should be used
Very small quantity of solvent is required

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Mass Transfer
An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii)

Less number of trays are required
Composition of the residue remains unchanged
More number of trays are required but the residue composition remains unchanged
More number of trays are required and the residue composition is more dilute in methanol

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