# GATE Papers >> Mechanical >> 2020 >> Question No 161

Question No. 161

Water flows through a tube of 3 cm internal diameter and length 20 m. The outside surface of the tube is heated electrically so that it is subjected to uniform heat flux circumferentially and axially. The mean inlet and exit temperatures of the water are 10ºC and 70ºC, respectively. The mass flow rate of the water is 720 kg/h. Disregard the thermal resistance of the tube wall. The internal heat transfer coefficient is 1697 W/m2·K. Take specific heat Cp of water as 4.179 kj/kg·K. The inner surface temperature at the exit section of the tube is _________________ ºC ( round off to one decimal place ).

##### Answer : 85.1 to 86.1

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