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Heat and Mass Transfer

Heat and Mass Transfer
LMTD in case of counter flow heat exchanger as compared to parallel flow heat exchanger is

Lower
Depends on the area of heat exchanger
Higher
Same

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Heat and Mass Transfer
Thermal conductivity of air with rise in temperature

Decreases
Increases
May increase or decrease depending on temperature
Remain constant

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

Convection
Conduction
None of these
Radiation

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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

One
Three
Two
Four

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Heat and Mass Transfer
The most commonly used method for the design of duct size is the

Velocity reduction method
Dual or double method
Equal friction method
Static regains method

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Heat and Mass Transfer
The amount of radiation mainly depends upon the

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

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