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Heat and Mass Transfer

Heat and Mass Transfer
Unit of thermal conductivity in S.I. units is

Option (B) and (C) above
J/m °K sec
J/m² sec
W/m °K

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

Same
Less
More
Depends on other factors

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Heat and Mass Transfer
According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a

Brilliant white polished body
Red hot body
Grey body
Black body

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Heat and Mass Transfer
The highest thermal diffusivity is of

Wood
Concrete
Lead
Iron

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Heat and Mass Transfer
The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

Equal to Nusselt number
Equal to one
Less than one
Greater than one

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

Temperature
Time
Thickness
Area

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