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Heat and Mass Transfer

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

Convection
Radiation
Conduction and radiation combined
Conduction

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Heat and Mass Transfer
When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by

Convection
Conduction and convection
Conduction
Radiation

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Heat and Mass Transfer
Thermal diffusivity is a

Physical property of a substance
Dimensionless parameter
All of these
Function of temperature

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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
60°C
20°C
66.7°C

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Heat and Mass Transfer
In free convection heat transfer, Nusselt number is function of

Grashoff number, Prandtl number and Reynold number
Prandtl number and Reynold number
Grashoff number and Prandtl number
Grashoff number and Reynold number

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Heat and Mass Transfer
40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is

0.45
0.55
0.75
0.4

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MORE MCQ ON Heat and Mass Transfer

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