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Heat and Mass Transfer

Heat and Mass Transfer
If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of

81
270
9
3

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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
40°C
20°C

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Heat and Mass Transfer
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Wien's law
Kirchhoff's law
Planck's law
Stefan's law

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Heat and Mass Transfer
The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

Equal to Nusselt number
Greater than one
Less than one
Equal to one

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Heat and Mass Transfer
If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called

Absorptive power
None of these
Emissive power
Emissivity

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Heat and Mass Transfer
The unit of Stefan Boltzmann constant is

watt/cm2 °K⁴
watt2/cm °K⁴
watt/cm4 °K
watt/cm3 °K

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