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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
W/m °K
J/m² sec
J/m °K sec

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Heat and Mass Transfer
Fourier's law of heat conduction gives the heat flow for

One dimensional cases only
Nonuniform temperature surfaces
Two dimensional cases only
Irregular surfaces

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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

Two
One
Three
Four

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Heat and Mass Transfer
The amount of radiation mainly depends on

Nature of body
Temperature of body
Type of surface of body
All of these

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

Less
Depends on other factors
Same
More

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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

Thickness
Time
Temperature
Area

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