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Heat and Mass Transfer

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

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

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Heat and Mass Transfer
The expression Q = ρ AT4 is called

Newton Reichmann equation
Fourier equation
Joseph-Stefan equation
Stefan-Boltzmann equation

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Heat and Mass Transfer
A grey body is one whose absorptivity

Varies with wavelength of the incident ray
Varies with temperature
Is equal to its emissivity
Does not vary with temperature and. wavelength of the incident ray

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Heat and Mass Transfer
The most commonly used method for the design of duct size is the

Velocity reduction method
Static regains method
Equal friction method
Dual or double method

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Heat and Mass Transfer
Depending on the radiating properties, body will be transparent when(Where a = absorptivity, p = reflectivity, x = transmissivity)

P = 0, x= 1, and a = 0
P = 0, x = 0 and a = 1
P=1, x = 0, and a = 0
X = 0, a + p = 1

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Heat and Mass Transfer
Fourier's law of heat conduction is valid for

Regular surfaces having non-uniform temperature gradients
One dimensional cases only
Two dimensional cases only
Three dimensional cases only

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