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Heat and Mass Transfer

Heat and Mass Transfer
According to Stefan's law, the total radiation from a black body per second per unit area is proportional to

Absolute temperature
T5
T
T2

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Heat and Mass Transfer
The transfer of heat by molecular collision is smallest in

Solids
None of these
Liquids
Gases

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Heat and Mass Transfer
Unit of thermal conductivity in S.I. units is

Option (B) and (C) above
J/m² sec
J/m °K sec
W/m °K

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Heat and Mass Transfer
According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a

Grey body
Red hot body
Black body
Brilliant white polished body

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Heat and Mass Transfer
An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m²). The critical thickness of insulation will be

40 mm
160 mm
800 mm
25 mm

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Heat and Mass Transfer
The rate of heat flow through a body is Q = [kA (T₁ - T₂)]/x. The term x/kA is known as

None of these
Thermal resistance
Thermal conductivity
Thermal coefficient

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