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 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 16.5 kW/m² 11.2 kW/m² 12.0 kW/m² 14.6 kW/m² 16.5 kW/m² 11.2 kW/m² 12.0 kW/m² ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Dietus-Boelter equation cannot be used for molten metals mainly due to its very low viscosity Prandtl number Grashoff number thermal conductivity viscosity Prandtl number Grashoff number thermal conductivity ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Which one gives the monochromatic emissive power for black body radiation ? Kirchhoffs law Wien's law Planck's law Stefan-Boltzman law Kirchhoffs law Wien's law Planck's law Stefan-Boltzman law ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A black body does not __________ radiation. Refract Reflect Both B & C Absorb or emit Refract Reflect Both B & C Absorb or emit ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A 2-4 heat exchanger involves Smaller pressure drop compared to 1-2 exchanger Only parallel-flow of fluids Both counter and parallel-flow of the fluids Only counter-flow of fluids Smaller pressure drop compared to 1-2 exchanger Only parallel-flow of fluids Both counter and parallel-flow of the fluids Only counter-flow of fluids ANSWER DOWNLOAD EXAMIANS APP
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