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HEAT AND MASS TRANSFER

Heat and Mass Transfer
In case of liquids and gases, the heat transfer takes place according to

Radiation
Convection
None of these
Conduction

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Heat and Mass Transfer
Depending on the radiating properties, a body will be opaque when

P = 0, x = 0 and a = 1
P=1, x = 0 and a = 0
X = 0, a + p = 1
P = 0, x = 1 and a = 0

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Heat and Mass Transfer
Log mean temperature difference in case of counter flow compared to parallel flow will be

Depends on other factors
Same
More
Less

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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

Both convection and conduction
Radiation
Conduction
Convection

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Heat and Mass Transfer
Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.

Maximum energy
Minimum energy
Both (A) and (B)
None of these

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