Heat Transfer
The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the

Heating volume
Nusselt number
Heat transfer area
None of these

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Heat Transfer
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the

Constant temperature equal to that of the base
Surrounding temperature
Temperature of the fin end
Average temperature of the fin

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