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Heat and Mass Transfer

Heat and Mass Transfer
Heat transfer by radiation mainly depends upon

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

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Heat and Mass Transfer
According to Wien's law, the wavelength corresponding to maximum energy is proportion to

Absolute temperature (T)
I²
F
T

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Heat and Mass Transfer
All radiations in a black body are

Absorbed
Refracted
Reflected
Transmitted

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Heat and Mass Transfer
40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is

0.55
0.4
0.45
0.75

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Heat and Mass Transfer
Thermal conductivity of water at 20°C is of the order of

0.23
0.1
0.51
0.42

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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
=-2/3
=-1/3
1

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