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Heat and Mass Transfer

Heat and Mass Transfer
The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit

Area
Time
Thickness
Temperature

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Heat and Mass Transfer
Thermal diffusivity is a

Physical property of a substance
Function of temperature
All of these
Dimensionless parameter

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Heat and Mass Transfer
Heat transfer takes place as per

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

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Heat and Mass Transfer
The ratio of surface convection resistance to the internal conduction resistance is known as

Prandtl number
Biot number
Grashoff number
Stanton number

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Heat and Mass Transfer
Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be

Three
One
Four
Two

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Heat and Mass Transfer
Which of the following is the case of heat transfer by radiation?

Heat received by a person from fireplace
Heating of building
Blast furnace
Cooling of parts in furnace

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