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
Both A and B
None of these
The size of the exchanger in which heat transfer rate is 1 kcal/hr

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Heat Transfer
Nusselt number is the ratio of the

None of these
Temperature gradient of the wall to that across the entire pipe
Heat flux at the wall to that across the entire pipe
Temperature difference to the temperature gradient at the wall

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