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

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
Both B & C

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Heat Transfer
Nusselt number is the ratio of the

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

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