Heat Transfer
To reduce the tube side pressure drop for the same flow rate, the heat exchanger recomended is

3-2 heat exchanger
1-2 heat exchanger
1-1 heat exchanger
2-4 heat exchanger

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Heat Transfer
In a heat exchanger, one transfer unit means

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
Both A and B
None of these

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