Heat Transfer
For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it

Decreases the outlet temperature of cooling medium
Increases the overall heat transfer coefficient
Decreases the pressure drop
None of these

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Heat Transfer
In a heat exchanger, one transfer unit means

Both A and B
A section of the exchanger in which change in temperature of one stream equals the average driving force in the section
The size of the exchanger in which heat transfer rate is 1 kcal/hr
None of these

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