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Heat and Mass Transfer

Heat and Mass Transfer
The heat of sun reaches to us according to

Conduction
Convection
Radiation
None of these

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Heat and Mass Transfer
The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit

Temperature
Area
Time
Thickness

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Heat and Mass Transfer
In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by

Convection
Radiation
Both convection and conduction
Conduction

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Heat and Mass Transfer
The most commonly used method for the design of duct size is the

Equal friction method
Velocity reduction method
Dual or double method
Static regains method

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Heat and Mass Transfer
The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number) n, where n is equal to

-1
=-1/3
=-2/3
1

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Heat and Mass Transfer
The heat is transferred by conduction, convection and radiation in

Condensation of steam in condenser
Melting of ice
None of these
Boiler furnaces

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