Heat Transfer
Film boiling is usually not desired in commercial equipments, because

it is difficult to maintain
none of the listed here
it is not economic
the heat transfer rate is low in view of the large temperature drop. @

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Heat Transfer
In a shell and tube heat exchanger,

There is no relationship between temperature drop and resistance
The temperature drop is inversely proportional to the resistance across which the drop occurs
The temperature drops in the two fluids and the wall are proportional to individual resistances
The relationship is not generalised

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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

15 min
44 min
51 min
22 min

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