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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
< 1
None of these
1

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

Zero
Same for all wavelengths
Unity
Different for all wavelengths

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Heat Transfer
Rate of crystallisation does not depend upon the

Number and active surface area of the crystals
Extent of supersaturation
None of these
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.

Dalton's
Stefan's
Kirchoffs
Wien'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?

White paint
Yellow paint
Black paint
Grey paint

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