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Heat and Mass Transfer

Heat and Mass Transfer
The product of Reynolds number and Prandtl number is known as

Stanton number
Biot number
Peclet number
Grashoff number

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Heat and Mass Transfer
Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.

Both (A) and (B)
Minimum energy
None of these
Maximum energy

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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
3
9
270

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Heat and Mass Transfer
Thermal conductivity of glass wool varies from sample to sample because of variation in

Composition
All of these
Density
Porosity

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Heat and Mass Transfer
In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.

Greater
None of these
Same
Less

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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

Emissivity
Absorptive power
None of these
Emissive power

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