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Heat and Mass Transfer

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

K calm/hr °C
K cal m/hr m² °C
K cal/hr m² °C
K cal/kg m² °C

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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

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

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Heat and Mass Transfer
Thermal conductivity of solid metals with rise in temperature normally

Increases
May increase or decrease depending on temperature
Decreases
Remain constant

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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

=-1/3
=-2/3
1
-1

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Heat and Mass Transfer
Upto the critical radius of insulation,

Heat flux will decrease
Convective heat loss will be less than conductive heat loss
Added insulation will increase heat loss
Added insulation will decrease heat loss

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Heat and Mass Transfer
When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a

Grey body
Black body
White body
Opaque body

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