Heat and Mass Transfer When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body, α + ρ = 1 and τ = 0 α = 0, ρ = 0 and τ = 1 α = 1, ρ = 0 and τ = 0 α = 0, ρ = 1 and τ = 0 α + ρ = 1 and τ = 0 α = 0, ρ = 0 and τ = 1 α = 1, ρ = 0 and τ = 0 α = 0, ρ = 1 and τ = 0 ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number) n, where n is equal to 1 =-2/3 =-1/3 -1 1 =-2/3 =-1/3 -1 ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The product of Reynolds number and Prandtl number is known as Biot number Stanton number Grashoff number Peclet number Biot number Stanton number Grashoff number Peclet number ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called Absorptive power Emissivity None of these Emissive power Absorptive power Emissivity None of these Emissive power ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer In heat transfer, conductance equals conductivity (kcal/hr/sq.m/°C/cm) divided by °C (temperature) Sq. m (area) K.cal (heat) Hr (time) °C (temperature) Sq. m (area) K.cal (heat) Hr (time) ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Thermal diffusivity of a substance is Directly proportional to the thermal conductivity All of these Inversely proportional to specific heat Inversely proportional to density of substance Directly proportional to the thermal conductivity All of these Inversely proportional to specific heat Inversely proportional to density of substance ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS