Heat Transfer
The actual temperature drop across the heating surface in an evaporator depends on the

All of these
Depth of liquid over heating surface
Pressure difference between steam chest and vapour space
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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

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

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