Heat Transfer
Heat transfer occurs by natural convection because change in temperature causes difference in

Heat capacity
Thermal conductivity
Density
Viscosity

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Heat Transfer
In a heat exchanger, one transfer unit means

The size of the exchanger in which heat transfer rate is 1 kcal/hr
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

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