Heat Transfer
A concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires

Less heating surface
More space
Lower maintenance cost
None of these

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Heat Transfer
Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer can not take place

Both B & C
From one part of a body to the another part of the same body
Between two bodies not in physical contact with each other
Between two bodies in physical contact with each other

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