Heat and Mass Transfer The concept of overall coefficient of heat transfer is used in case of heat transfer by Conduction and convection Conduction Convection Radiation Conduction and convection Conduction Convection Radiation ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer A non-dimensional number generally associated with natural convection heat transfer is Nusselt number Weber number Prandtl number Grashoff number Nusselt number Weber number Prandtl number Grashoff number ANSWER DOWNLOAD EXAMIANS APP
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 3 270 9 81 3 270 9 81 ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer In regenerator type heat exchanger, heat transfer takes place by Flow of hot and cold fluids alternately over a surface Direct mixing of hot and cold fluids Generation of heat again and again A complete separation between hot and cold fluids Flow of hot and cold fluids alternately over a surface Direct mixing of hot and cold fluids Generation of heat again and again A complete separation between hot and cold fluids ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity) RN = μ cp/k RN = hl/k RN = ρ V l /μ RN = V²/t.cp RN = μ cp/k RN = hl/k RN = ρ V l /μ RN = V²/t.cp ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Which of the following is a case of steady state heat transfer? Heating of building in winter None of these Air preheaters I.C. engine Heating of building in winter None of these Air preheaters I.C. engine ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS