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Heat and Mass Transfer

Heat and Mass Transfer
Stefan Boltzmann law is applicable for heat transfer by

Conduction and radiation combined
Convection
Radiation
Conduction

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

May increase or decrease depending upon temperature
Remain same
Decreases
Increases

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Heat and Mass Transfer
Unit of thermal conductivity in S.I. units is

J/m² sec
Option (B) and (C) above
W/m °K
J/m °K sec

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

More
Depends on other factors
Same
Less

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Heat and Mass Transfer
Which of the following has maximum value of thermal conductivity?

Copper
Aluminium
Brass
Steel

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Heat and Mass Transfer
A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is

40°C
66.7°C
20°C
60°C

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