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Heat and Mass Transfer

Heat and Mass Transfer
The rate of energy transferred by convection to that by conduction is called

Peclet number
Stanton number
Biot number
Nusselt number

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Heat and Mass Transfer
Which of the following is expected to have highest thermal conductivity?

Solid ice
Melting ice
Steam
Water

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Heat and Mass Transfer
Which of the following property of air does not increase with rise in temperature?

Thermal diffusivity
Dynamic viscosity
Thermal conductivity
Density

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Heat and Mass Transfer
The thermal diffusivities for solids are generally

Less than those for gases
More or less same as for liquids and gases
Less than those for liquids
More than those for liquids and gases

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

None of these
Convection
Conduction
Radiation

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Heat and Mass Transfer
All radiations in a black body are

Refracted
Reflected
Absorbed
Transmitted

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