Heat and Mass Transfer
The amount of heat flow through a body by conduction is

Directly proportional to the temperature difference on the two faces of the body
All of these
Dependent upon the material of the body
Directly proportional to the surface area of the body

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Heat and Mass Transfer
In counter flow heat exchangers

Both the fluids at exit are in their hottest state
Both the fluids at inlet are in their hottest state
Both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state
One fluid is in hottest state and other in coldest state at inlet

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