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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/m² sec
J/m °K sec
W/m °K

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Heat and Mass Transfer
Pick up the wrong case. Heat flowing from one side to other depends directly on

Thickness
Face area
Temperature difference
Time

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Heat and Mass Transfer
An ordinary passenger aircraft requires a cooling system of capacity.

8 TR
2 TR
10 TR
4 TR

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Heat and Mass Transfer
The ratio of the energy absorbed by the body to total energy falling on it is called

Emissivity
Absorptivity
Absorptive power
Emissive power

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Heat and Mass Transfer
Reynolds number is the ratio of

Kinematic viscosity to thermal diffusivity
Inertia force to viscous force
Energy transferred by convection to that by conduction
None of these

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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.

Directly proportional to
Inversely proportional to
None of these
Equal to

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