Heat and Mass Transfer Cork is a good insulator because it has Porous body Atoms colliding frequency Low density Free electrons Porous body Atoms colliding frequency Low density Free electrons ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is Less than one Equal to Nusselt number Equal to one Greater than one Less than one Equal to Nusselt number Equal to one Greater than one ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Thermal conductivity of water in general with rise in temperature May increase or decrease depending on temperature Decreases Increases Remain constant May increase or decrease depending on temperature Decreases Increases Remain constant ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Unit of thermal diffusivity is kcal/m² hr kcal/m. hr °C m²/hr °C m²/hr kcal/m² hr kcal/m. hr °C m²/hr °C m²/hr ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer According to Prevost theory of heat exchange It is impossible to transfer heat from low temperature source to t high temperature source Heat transfer by radiation requires no medium All bodies above absolute zero emit radiation Heat transfer in most of the cases takes place by combination of conduction, convection and radiation It is impossible to transfer heat from low temperature source to t high temperature source Heat transfer by radiation requires no medium All bodies above absolute zero emit radiation Heat transfer in most of the cases takes place by combination of conduction, convection and radiation 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 66.7°C 40°C 60°C 20°C 66.7°C 40°C 60°C 20°C ANSWER DOWNLOAD EXAMIANS APP
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