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HEAT TRANSFER

Heat Transfer
Radiation heat transfer rates does not depend upon the

type of absorbing surface
surface area and temperature of the heat source
none of the listed here
distance between the heat source and the object receiving the heat

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Heat Transfer
Which of the following is correct ?

Rate = Resistance/Driving force
Resistance = Driving force x Rate
Driving force = Rate x Resistance
Rate = Driving force x Resistance

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Heat Transfer
Heat transfer rate per unit area is called

heat transfer co-efficient
thermal conductivity
heat flux
thermal diffusivity

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Heat Transfer
Log mean temperature difference (LMTD) cannot be used, if

there exists an unsteady state
heat transfer co-efficient over the entire heat exchanger is not constant
the heat capacity is not constant and there is a phase change.
none of the listed here

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Heat Transfer
As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient

goes through a maximum.
goes through a minimum
continues to increase
continues to decrease

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