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HEAT TRANSFER

Heat Transfer
At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical?

> 1
None of these
1
< 1

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Heat Transfer
A body is called grey if the monochromatic emissivity of the body is

Unity
Same for all wavelengths
Different for all wavelengths
Zero

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Heat Transfer
Rate of crystallisation does not depend upon the

None of these
Extent of supersaturation
Number and active surface area of the crystals
Turbulence within the solution

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Heat Transfer
Wavelength corresponding to the maximum energy is inversely proportional to the absolute temperature. This is __________ law.

Stefan's
Wien's
Kirchoffs
Dalton's

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Heat Transfer
A tank painted with which of the following coloured paints, would heat up maximum by radiation from sun?

Yellow paint
White paint
Grey paint
Black paint

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