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Heat and Mass Transfer

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
1
=-1/3
=-2/3

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Heat and Mass Transfer
In heat transfer, conductance equals conductivity (kcal/hr/sq.m/°C/cm) divided by

Hr (time)
Sq. m (area)
°C (temperature)
K.cal (heat)

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

May increase or decrease depending on temperature
Increases
Remain constant
Decreases

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Heat and Mass Transfer
Sensible heat is the heat required to

Increase the temperature of a liquid of vapour
Convert water into steam and superheat it
Change liquid into vapour
Change vapour into liquid

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Heat and Mass Transfer
The value of the wavelength for maximum emissive power is given by

Planck's law
Wien’s law
Stefan's law
Fourier's law

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Heat and Mass Transfer
Thermal diffusivity of a substance is

All of these
Directly proportional to the thermal conductivity
Inversely proportional to density of substance
Inversely proportional to specific heat

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