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Heat and Mass Transfer

Heat and Mass Transfer
Planck’s law holds good for

polished bodies
All of these
black bodies
all coloured bodies

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Heat and Mass Transfer
Log mean temperature difference in case of counter flow compared to parallel flow will be

Depends on other factors
Less
Same
More

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Heat and Mass Transfer
Thermal diffusivity of a substance is

All of these
Inversely proportional to density of substance
Directly proportional to the thermal conductivity
Inversely proportional to specific heat

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Heat and Mass Transfer
Thermal diffusivity is

Used as mathematical model
A physical property of the material
A dimensionless parameter
Function of temperature

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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

Emissive power
Emissivity
Absorptive power
None of these

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Heat and Mass Transfer
Heat transfer takes place as per

Kirchoff's law
First law of thermodynamic
Zeroth law of thermodynamics
Second law of the thermodynamics

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