Heat Transfer LMTD for counterflow and prallel flow heat exchanger will be the same, when the Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid None of these Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid) Outlent temperature of both the hot and cold fluid are same Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid None of these Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid) Outlent temperature of both the hot and cold fluid are same ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Prandtl number is the reciprocal of Thermal diffusivity x Momentum Thermal diffusivity x Mass diffusivity Mass diffusivity x Momentum diffusivity Thermal diffusivity/Momentum diffusivity Thermal diffusivity x Momentum Thermal diffusivity x Mass diffusivity Mass diffusivity x Momentum diffusivity Thermal diffusivity/Momentum diffusivity ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer With increase in porosity, the thermal conductivity of a solid substance Remains unchanged Decreases Increases May increase or decrease; depends on the solid Remains unchanged Decreases Increases May increase or decrease; depends on the solid ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is Less Either more or less ; depends on the nature of vapor Some More Less Either more or less ; depends on the nature of vapor Some More ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer With the increase of temperature, the Col-burn jH factor Decreases Increases Remains unchanged May increase or decrease ; depending on temperature Decreases Increases Remains unchanged May increase or decrease ; depending on temperature ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of 6.1 1.74 1 37 6.1 1.74 1 37 ANSWER DOWNLOAD EXAMIANS APP
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