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Heat and Mass Transfer

Heat and Mass Transfer
The transfer of heat by molecular collision is known as

None of these
Convection
Conduction
Radiation

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Heat and Mass Transfer
Radiation is the process of heat transfer in which heat flows from a ________, in a straight line, without affecting the intervening medium.

Cold body to hot body
Smaller body to larger body
Larger body to smaller body
Hot body to cold body

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

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

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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

Four
Three
One
Two

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Heat and Mass Transfer
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Move actually
Do not move actually
Does not affect the intervening medium
Affect the intervening medium

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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

Grey body
Red hot body
Black body
Brilliant white polished body

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