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Heat and Mass Transfer

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

More
Less
Same
Depends on other factors

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Heat and Mass Transfer
Planck’s law holds good for

All of these
polished bodies
black bodies
all coloured bodies

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Heat and Mass Transfer
The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as

Transmissivity
Reflectivity
Intensity of radiation
Emissivity

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Heat and Mass Transfer
The concept of overall coefficient of heat transfer is used in case of heat transfer by

Convection
Conduction
Radiation
Conduction and convection

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Heat and Mass Transfer
In free convection heat transfer, Nusselt number is function of

Prandtl number and Reynold number
Grashoff number, Prandtl number and Reynold number
Grashoff number and Prandtl number
Grashoff number and Reynold 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

Two
Three
One
Four

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MORE MCQ ON Heat and Mass Transfer

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