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Heat and Mass Transfer

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
White body
Opaque body
Black body

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Heat and Mass Transfer
If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called

None of these
Emissivity
Absorptive power
Emissive power

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

Stefan’s law
Kirchhoff’s law
Planck’s law
Wine’s law

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Heat and Mass Transfer
Cork is a good insulator because it has

Low density
Porous body
Free electrons
Atoms colliding frequency

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Heat and Mass Transfer
Heat transfer by radiation mainly depends upon

Kind and extent of its surface
Nature of the body
Its temperature
All of these

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Heat and Mass Transfer
Which of the following is a case of steady state heat transfer?

None of these
Heating of building in winter
Air preheaters
I.C. engine

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