Heat and Mass Transfer The unit of Stefan Boltzmann constant is watt/cm2 °K⁴ watt/cm4 °K watt2/cm °K⁴ watt/cm3 °K watt/cm2 °K⁴ watt/cm4 °K watt2/cm °K⁴ watt/cm3 °K 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 A complete separation between hot and cold fluids Generation of heat again and again Flow of hot and cold fluids alternately over a surface Direct mixing of hot and cold fluids A complete separation between hot and cold fluids Generation of heat again and again ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The logarithmic mean temperature difference (tm) is given by (where Δt1 and Δt2 are temperature differences between the hot and cold fluids at entrance and exit) tm = tm = (Δt1 - Δt2) loge (Δt1/Δt2) tm = loge (Δt1/Δt2)/ (Δt1 - Δt2) tm = loge (Δt1 - Δt2)/ Δt1/Δt2 tm = (Δt1 - Δt2)/ loge (Δt1/Δt2) tm = tm = (Δt1 - Δt2) loge (Δt1/Δt2) tm = loge (Δt1/Δt2)/ (Δt1 - Δt2) tm = loge (Δt1 - Δt2)/ Δt1/Δt2 tm = (Δt1 - Δt2)/ loge (Δt1/Δt2) ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in All of these Cross flow Parallel flow Counter flow All of these Cross flow Parallel flow Counter flow ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to Fourth power of absolute temperature Square of temperature Fourth power of temperature Absolute temperature Fourth power of absolute temperature Square of temperature Fourth power of temperature Absolute temperature ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Thermal diffusivity is a Dimensionless parameter Function of temperature All of these Physical property of a substance Dimensionless parameter Function of temperature All of these Physical property of a substance ANSWER DOWNLOAD EXAMIANS APP
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