Heat Transfer The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m². The flux, when the element temperature is increased to 1000°C for the same furnace temperature is 14.6 kW/m² 11.2 kW/m² 12.0 kW/m² 16.5 kW/m² 14.6 kW/m² 11.2 kW/m² 12.0 kW/m² 16.5 kW/m² ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In thermal radiation for a black body (where, ε is emissivity and α is absorptivity) α ≠ 1, ε ≠ 1 α ≠ 1, ε = 1 α = 1; ε = 1 α = 1; ε ≠ 1 α ≠ 1, ε ≠ 1 α ≠ 1, ε = 1 α = 1; ε = 1 α = 1; ε ≠ 1 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In Biot number, the characteristic length used is the ratio of the __________ of the solid. Volume to surface area Surface area to perimeter Perimeter to surface area Surface area to volume Volume to surface area Surface area to perimeter Perimeter to surface area Surface area to volume ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer __________ paint has the minimum absorption co-efficient. Black Grey White lead Light cream Black Grey White lead Light cream ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Fourier's law of heat conduction applies to __________ surfaces. Both A and B Neither A and B Isothermal Non-isothermal Both A and B Neither A and B Isothermal Non-isothermal ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Log mean temperature difference (LMTD) cannot be used, if heat transfer co-efficient over the entire heat exchanger is not constant the heat capacity is not constant and there is a phase change. there exists an unsteady state none of the listed here heat transfer co-efficient over the entire heat exchanger is not constant the heat capacity is not constant and there is a phase change. there exists an unsteady state none of the listed here ANSWER DOWNLOAD EXAMIANS APP
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