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Heat and Mass Transfer

Heat and Mass Transfer
Emissivity of a white polished body in comparison to a black body is

Same
Higher
Lower
Depends upon the shape of body

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Heat and Mass Transfer
Thermal conductivity of solid metals with rise in temperature normally

Increases
Remain constant
May increase or decrease depending on temperature
Decreases

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Heat and Mass Transfer
Temperature of steam at around 540°C can be measured by

None of these
Thermometer
Thermistor
Thermocouple

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Heat and Mass Transfer
The expression Q = ρ AT4 is called

Stefan-Boltzmann equation
Fourier equation
Joseph-Stefan equation
Newton Reichmann equation

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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
Four
Three
Two

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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

66.7°C
60°C
20°C
40°C

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