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Heat and Mass Transfer

Heat and Mass Transfer
Stefan Boltzmann law is applicable for heat transfer by

Convection
Conduction and radiation combined
Radiation
Conduction

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Heat and Mass Transfer
Metals are good conductors of heat because

They have high density
Their atoms collide frequently
They contain free electrons
Their atoms are relatively far apart

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Heat and Mass Transfer
The heat transfer takes place according to

Zeroth law of thermodynamics
First law of thermodynamics
Second law of thermodynamics
Kirchhoff's law

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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

Absorptive power
Emissive power
Emissivity
None of these

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Heat and Mass Transfer
Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called

Thermal resistance
Thermal coefficient
Temperature gradient
Thermal conductivity

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Heat and Mass Transfer
The energy distribution of an ideal reflector at higher temperatures is largely in the range of

Remain same at all wavelengths
Shorter wavelength
Longer wavelength
Wavelength has nothing to do with it

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