Heat Transfer
The absorptivity of a body is equal to its emissivity

none of the listed here
under thermal equilibrium
for circular bodies
at a particular temperature

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Heat Transfer
Prandtl number is the ratio of

Thermal diffusivity to mass diffusivity
Momentum diffusivity to thermal diffusivity
Momentum diffusivity to mass diffusivity
Thermal diffusivity to momentum diffusivity

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Heat Transfer
Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m² .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

Lower pressure drop through the exchanger is desired
Condensate is corrosive in nature
Higher condensing film co-efficient is desired
Temperature of the incoming vapor is very high

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