Heat Transfer Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the Sum of all resistances Maximum resistance in the series Minimum resistance presents in the series Average of all resistances Sum of all resistances Maximum resistance in the series Minimum resistance presents in the series Average of all resistances ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer If Prandtl number is greater than the Schmidt number, then the concentration boundary layer lies inside the thermal boundary layer thermal boundary layer lies inside the concentration boundary layer none of the listed here thermal & concentration boundary layers are of equal thickness concentration boundary layer lies inside the thermal boundary layer thermal boundary layer lies inside the concentration boundary layer none of the listed here thermal & concentration boundary layers are of equal thickness ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid Its evaporation loss Uneconomic LMTD Decrease in heat exchanger efficiency Excessive corrosion Its evaporation loss Uneconomic LMTD Decrease in heat exchanger efficiency Excessive corrosion ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it Increases the overall heat transfer coefficient None of these Decreases the pressure drop Decreases the outlet temperature of cooling medium Increases the overall heat transfer coefficient None of these Decreases the pressure drop Decreases the outlet temperature of cooling medium ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade? 35.5 43.75 48.25 81.25 35.5 43.75 48.25 81.25 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
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