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 =-1/3 =-2/3 -1 1 =-1/3 =-2/3 -1 ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Thermal conductivity of air with rise in temperature Decreases Increases Remain constant May increase or decrease depending on temperature Decreases Increases Remain constant May increase or decrease depending on temperature ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The rate of heat flow through a body is Q = [kA (Tâ - Tâ)]/x. The term x/kA is known as Thermal resistance Thermal coefficient Thermal conductivity None of these Thermal resistance Thermal coefficient Thermal conductivity None of these ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Heat is closely related with Temperature Liquids Entropy Energy Temperature Liquids Entropy Energy 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 Counter flow Parallel flow Cross flow All of these Counter flow Parallel flow Cross flow All of these ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as Planck's law Kirchhoff's law Wien's law Stefan's law Planck's law Kirchhoff's law Wien's law Stefan's law ANSWER DOWNLOAD EXAMIANS APP
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