Mass Transfer
HETP is numerically equal to HTU, only when the operating line

Lies below the equilibrium line
Is far from the equilibrium line
Lies above the equilibrium line
And equilibrium lines are parallel

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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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