Heat Transfer
Vent pipes are provided in a condenser to

Remove non-condensable gases
Facilitate easy cleaning of tubes
None of these
Purge the condenser

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Heat Transfer
1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m² and the overall heat transfer co-efficient to the liquid is 1500 W/m².°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be

22 min
51 min
44 min
15 min

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Heat Transfer
Nusselt number is the ratio of the

None of these
Heat flux at the wall to that across the entire pipe
Temperature difference to the temperature gradient at the wall
Temperature gradient of the wall to that across the entire pipe

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