Heat and Mass Transfer Thermal conductivity of air with rise in temperature Remain constant May increase or decrease depending on temperature Increases Decreases Remain constant May increase or decrease depending on temperature Increases Decreases 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 None of these Emissive power Emissivity Absorptive power None of these Emissive power Emissivity ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is Greater than one Less than one Equal to one Equal to Nusselt number Greater than one Less than one Equal to one Equal to Nusselt number ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Radiation is the process of heat transfer in which heat flows from a ________, in a straight line, without affecting the intervening medium. Cold body to hot body Hot body to cold body Larger body to smaller body Smaller body to larger body Cold body to hot body Hot body to cold body Larger body to smaller body Smaller body to larger body 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 White body Opaque body Black body Grey body White body Opaque body Black body Grey body ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The thermal diffusivities for gases are generally More than those for liquids More than those for solids Dependent on the viscosity Less than those for liquids More than those for liquids More than those for solids Dependent on the viscosity Less than those for liquids ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS