Heat Transfer A concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires More space Less heating surface None of these Lower maintenance cost More space Less heating surface None of these Lower maintenance cost ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer With increase in temperature, the thermal conductivity of steel Increases exponentially Increases Decreases Remains unchanged Increases exponentially Increases Decreases Remains unchanged ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone. None of the listed here laminar highly turbulent transition None of the listed here laminar highly turbulent transition ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is Thin walled having the value of Ao Ai/< 2 Thick walled Both B and C Having the value of Ao/Ai > 2 Thin walled having the value of Ao Ai/< 2 Thick walled Both B and C Having the value of Ao/Ai > 2 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Indirect contact heat exchangers are preferred over direct contact heat exchangers, because Cost of equipment is lower There is no risk of contamination Heat transfer co-efficient are high There is no mist formation Cost of equipment is lower There is no risk of contamination Heat transfer co-efficient are high There is no mist formation ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time t = 800 s t = 400 s t = 283 s t = 356 s t = 800 s t = 400 s t = 283 s t = 356 s ANSWER DOWNLOAD EXAMIANS APP
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