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 0.45 0.55 0.75 0.4 0.45 0.55 0.75 0.4 ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Which of the following is the case of heat transfer by radiation? Heat received by a person from fireplace Heating of building Cooling of parts in furnace Blast furnace Heat received by a person from fireplace Heating of building Cooling of parts in furnace Blast furnace ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by Conduction Radiation Convection Both convection and conduction Conduction Radiation Convection Both convection and conduction ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in Boiler Electric heater Steam condenser Refrigerator condenser coils Boiler Electric heater Steam condenser Refrigerator condenser coils ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Which of the following is a case of steady state heat transfer? I.C. engine Air preheaters None of these Heating of building in winter I.C. engine Air preheaters None of these Heating of building in winter ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer According to Stefan's law, the total radiation from a black body per second per unit area is proportional to Absolute temperature T2 T T5 Absolute temperature T2 T T5 ANSWER DOWNLOAD EXAMIANS APP
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