Heat Transfer Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the Temperature of the fin end Average temperature of the fin Constant temperature equal to that of the base Surrounding temperature Temperature of the fin end Average temperature of the fin Constant temperature equal to that of the base Surrounding temperature ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally Remains unchanged Increases exponentially Decreases Increases Remains unchanged Increases exponentially Decreases Increases ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In which mode of heat transfer, the Biot number is important? Radiation Transient heat conduction Natural convection Forced convection Radiation Transient heat conduction Natural convection Forced convection ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Fouling factor Does not provide a safety factor for design Is a dimensionless quantity Accounts for additional resistances to heat flow None of these Does not provide a safety factor for design Is a dimensionless quantity Accounts for additional resistances to heat flow None of these ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is Shell and tube heat exchanger with air on shell side and steam inside tubes Finned tube heat exchanger with air outside and steam inside Finned tube heat exchanger with air inside and steam outside Shell and tube heat exchanger with air inside tubes and steam on shell side Shell and tube heat exchanger with air on shell side and steam inside tubes Finned tube heat exchanger with air outside and steam inside Finned tube heat exchanger with air inside and steam outside Shell and tube heat exchanger with air inside tubes and steam on shell side ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Which of the following is concerned with both heat and mass transfer ? Froude number Lewis relationship Kutateladze number Nusselt number Froude number Lewis relationship Kutateladze number Nusselt number ANSWER DOWNLOAD EXAMIANS APP
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