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Heat and Mass Transfer

Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

0.1
0.002
0.02
0.01

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Heat and Mass Transfer
According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)

Pb = pa - pv
Pb = pa × pv
Pb = pa + pv
Pb = pa/pv

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Heat and Mass Transfer
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Wien's law
Planck's law
Kirchhoff's law
Stefan's law

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Heat and Mass Transfer
Emissivity of a white polished body in comparison to a black body is

Lower
Higher
Depends upon the shape of body
Same

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Heat and Mass Transfer
The energy distribution of an ideal reflector at higher temperatures is largely in the range of

Longer wavelength
Remain same at all wavelengths
Shorter wavelength
Wavelength has nothing to do with it

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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
Higher
Depends on the area of heat exchanger
Same

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MORE MCQ ON Heat and Mass Transfer

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