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Heat and Mass Transfer

Heat and Mass Transfer
According to Wien's law, the wavelength corresponding to maximum energy is proportion to

T
F
I²
Absolute temperature (T)

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Heat and Mass Transfer
Thermal diffusivity is

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

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Heat and Mass Transfer
The thermal diffusivities for gases are generally

Dependent on the viscosity
More than those for solids
More than those for liquids
Less than those for liquids

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Heat and Mass Transfer
Total emissivity of polished silver compared to black body is

Same
Very much lower
More or less same
Higher

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

Biot number
Stanton number
Peclet number
Nusselt number

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Heat and Mass Transfer
Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by

Free convection
Radiation
Forced convection
Convection

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