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Heat and Mass Transfer

Heat and Mass Transfer
Heat transfer by radiation mainly depends upon

Its temperature
Nature of the body
All of these
Kind and extent of its surface

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Heat and Mass Transfer
Depending on the radiating properties, a body will be black when (Where a = absorptivity, p = reflectivity, X = transmissivity.)

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

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Heat and Mass Transfer
LMTD in case of counter flow heat exchanger as compared to parallel flow heat exchanger is

Lower
Same
Depends on the area of heat exchanger
Higher

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Heat and Mass Transfer
Fourier's law of heat conduction gives the heat flow for

Irregular surfaces
Nonuniform temperature surfaces
One dimensional cases only
Two dimensional cases only

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Heat and Mass Transfer
The use of heat exchangers is made in

Radiators in automobile
All of these
Condensers and evaporators in refrigeration and air conditioning units
Condensers and boilers in steam plants

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Heat and Mass Transfer
The amount of radiation mainly depends on

Nature of body
Type of surface of body
All of these
Temperature of body

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MORE MCQ ON Heat and Mass Transfer

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