Heat Transfer The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by Painting the surface white (with aluminium paint) Painting the surface black Giving the surface a mirror finish Roughening the surface Painting the surface white (with aluminium paint) Painting the surface black Giving the surface a mirror finish Roughening the surface ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Nusselt number is the ratio of the temperature gradient at the wall to None of these Temperature difference That across the entire pipe Heat flux None of these Temperature difference That across the entire pipe Heat flux ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Fourier's law applies to the heat transfer by radiation conduction convection None of the listed here radiation conduction convection None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The ratio of total radiating power to the absorptivity of the body depends upon the __________ as per Kirchoffs law. Nature of the body Temperature of the body None of these Wavelength of radiation Nature of the body Temperature of the body None of these Wavelength of radiation ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Film boiling is usually not desired in commercial equipments, because it is difficult to maintain it is not economic the heat transfer rate is low in view of the large temperature drop. @ none of the listed here it is difficult to maintain it is not economic the heat transfer rate is low in view of the large temperature drop. @ none of the listed here ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be 0.45 0.55 0.35 0.85 0.45 0.55 0.35 0.85 ANSWER DOWNLOAD EXAMIANS APP
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