Heat and Mass Transfer If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of 3 81 9 270 3 81 9 270 ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called Temperature gradient Thermal conductivity Thermal coefficient Thermal resistance Temperature gradient Thermal conductivity Thermal coefficient Thermal resistance ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Fouling factor is used In case of Newtonian fluids None of these When a liquid exchanges heat with a gas In heat exchanger design as a safety factor In case of Newtonian fluids None of these When a liquid exchanges heat with a gas In heat exchanger design as a safety factor ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Reynolds number is the ratio of Energy transferred by convection to that by conduction Kinematic viscosity to thermal diffusivity Inertia force to viscous force None of these Energy transferred by convection to that by conduction Kinematic viscosity to thermal diffusivity Inertia force to viscous force None of these ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Film coefficient is defined as the ratio of Temperature drop through the films of fluids to the thickness of film of fluids Thickness of film of fluid to the temperature drop through the films of fluids Thickness of film of fluid to the thermal conductivity Thermal conductivity to the equivalent thickness of the film of fluid Temperature drop through the films of fluids to the thickness of film of fluids Thickness of film of fluid to the temperature drop through the films of fluids Thickness of film of fluid to the thermal conductivity Thermal conductivity to the equivalent thickness of the film of fluid ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a Grey body Black body Opaque body White body Grey body Black body Opaque body White body ANSWER DOWNLOAD EXAMIANS APP
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