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Heat and Mass Transfer

Heat and Mass Transfer
The ratio of Nusselt number and the product of Reynold's number and Prandtl number is equal to

Stanton number
Biot number
Grashoff number
Peclet 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
Two
One
Four

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Heat and Mass Transfer
In a shell and tube heat exchanger, baffles are provided on the shell side to

Improve heat transfer
All of these
Prevent stagnation of shell side fluid
Provide support for tubes

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Heat and Mass Transfer
Thermal conductivity of water in general with rise in temperature

Decreases
Remain constant
Increases
May increase or decrease depending on temperature

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Heat and Mass Transfer
Cork is a good insulator because it has

Atoms colliding frequency
Low density
Free electrons
Porous body

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Heat and Mass Transfer
The heat is transferred by conduction, convection and radiation in

None of these
Melting of ice
Boiler furnaces
Condensation of steam in condenser

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