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Heat and Mass Transfer

Heat and Mass Transfer
Thermal conductivity of water at 20°C is of the order of

0.1
0.51
0.23
0.42

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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
Absorptive power
Emissivity
None of these

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Heat and Mass Transfer
The heat of sun reaches to us according to

Radiation
None of these
Conduction
Convection

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Heat and Mass Transfer
Joule sec is the unit of

Thermal conductivity
Universal gas constant
Kinematic viscosity
Planck's constant

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Heat and Mass Transfer
Heat transfer by radiation mainly depends upon

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

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Heat and Mass Transfer
If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of

3
9
81
270

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MORE MCQ ON Heat and Mass Transfer

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