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Heat and Mass Transfer

Heat and Mass Transfer
When heat is transferred by molecular collision, it is referred to as heat transfer by

Conduction
Convection
Radiation
Scattering

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Heat and Mass Transfer
Free convection flow depends on

Coefficient of viscosity
Density
All of these
Gravitational force

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Heat and Mass Transfer
A composite slab has two layers of different materials with thermal conductivities k₁ and k₂. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be

2 k₁ k₂/ (k₁ + k₂)
k₁ k₂
(k₁ + k₂)/ k₁ k₂
(k₁ + k₂)

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

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

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Heat and Mass Transfer
The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law.

None of these
Directly proportional to
Inversely proportional to
Equal to

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Heat and Mass Transfer
Thermal conductivity of water _________ with rise in temperature.

Decreases
Remain same
Increases
May increase or decrease depending upon temperature

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MORE MCQ ON Heat and Mass Transfer

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