Heat and Mass Transfer Unit of thermal conductivity in S.I. units is J/m °K sec W/m °K Option (B) and (C) above J/m² sec J/m °K sec W/m °K Option (B) and (C) above J/m² sec ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer In a shell and tube heat exchanger, baffles are provided on the shell side to Prevent stagnation of shell side fluid Provide support for tubes All of these Improve heat transfer Prevent stagnation of shell side fluid Provide support for tubes All of these Improve heat transfer ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The value of the wave length for maximum emissive power is given by Kirchhoff’s law Planck’s law Wine’s law Stefan’s law Kirchhoff’s law Planck’s law Wine’s law Stefan’s law ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The emissivity for a black body is 0.75 1 0.5 0.75 1 0.5 ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer According of Kirchhoff's law Radiant heat is proportional to fourth power of absolute temperature Emissive power depends on temperature Emissive power and absorptivity are constant for all bodies Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body Radiant heat is proportional to fourth power of absolute temperature Emissive power depends on temperature Emissive power and absorptivity are constant for all bodies Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is 40°C 60°C 66.7°C 20°C 40°C 60°C 66.7°C 20°C ANSWER DOWNLOAD EXAMIANS APP
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