Heat and Mass Transfer Emissivity of a white polished body in comparison to a black body is Higher Depends upon the shape of body Lower Same Higher Depends upon the shape of body Lower Same ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Absorptivity of a body will be equal to its emissivity At all temperatures When system is under thermal equilibrium At critical temperature At one particular temperature At all temperatures When system is under thermal equilibrium At critical temperature At one particular temperature ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger. Less Greater Same None of these Less Greater Same None of these ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to Square of temperature Fourth power of absolute temperature Fourth power of temperature Absolute temperature Square of temperature Fourth power of absolute temperature Fourth power of temperature Absolute temperature ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called Absorptive power Emissivity Emissive power None of these Absorptive power Emissivity Emissive power None of these ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer All radiations in a black body are Absorbed Reflected Refracted Transmitted Absorbed Reflected Refracted Transmitted ANSWER DOWNLOAD EXAMIANS APP
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