Heat and Mass Transfer When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a White body Black body Grey body Opaque body White body Black body Grey body Opaque body ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the Cube of the absolute temperature Absolute temperature Square of the absolute temperature Fourth power of the absolute temperature Cube of the absolute temperature Absolute temperature Square of the absolute temperature Fourth power of the absolute temperature ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The expression Q = ρ AT4 is called Newton Reichmann equation Fourier equation Joseph-Stefan equation Stefan-Boltzmann equation Newton Reichmann equation Fourier equation Joseph-Stefan equation Stefan-Boltzmann equation ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the Reynold's number, Grashoff's number Prandtl number, Grashoff's number Grashoff's number Reynold's number Reynold's number, Grashoff's number Prandtl number, Grashoff's number Grashoff's number Reynold's number ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Free convection flow depends on Coefficient of viscosity Gravitational force All of these Density Coefficient of viscosity Gravitational force All of these Density ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer In heat exchangers, degree of approach is defined as the difference between temperatures of Hot medium inlet and outlet Cold water inlet and outlet Hot medium outlet and cold water outlet Hot medium outlet and cold water inlet Hot medium inlet and outlet Cold water inlet and outlet Hot medium outlet and cold water outlet Hot medium outlet and cold water inlet ANSWER DOWNLOAD EXAMIANS APP