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Heat and Mass Transfer

Heat and Mass Transfer
The concept of overall coefficient of heat transfer is used in case of heat transfer by

Conduction and convection
Conduction
Convection
Radiation

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Heat and Mass Transfer
The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number) n, where n is equal to

=-2/3
-1
1
=-1/3

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Heat and Mass Transfer
An ordinary passenger aircraft requires a cooling system of capacity.

4 TR
10 TR
8 TR
2 TR

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

Increases
May increase or decrease depending on temperature
Remain constant
Decreases

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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

Black body
Brilliant white polished body
Grey body
Red hot body

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

Thermocouple
Thermometer
Thermistor
None of these

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