Heat and Mass Transfer 40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is 0.55 0.4 0.75 0.45 0.55 0.4 0.75 0.45 ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Which of the following is a case of steady state heat transfer? None of these I.C. engine Heating of building in winter Air preheaters None of these I.C. engine Heating of building in winter Air preheaters ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The value of Prandtl number for air is about 0.3 0.1 0.7 1.7 0.3 0.1 0.7 1.7 ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The highest thermal diffusivity is of Wood Concrete Iron Lead Wood Concrete Iron Lead ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law. Inversely proportional to Directly proportional to Equal to None of these Inversely proportional to Directly proportional to Equal to None of these ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as Radiation Conduction Forced convection Free convection Radiation Conduction Forced convection Free convection ANSWER DOWNLOAD EXAMIANS APP
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