Steam Boilers, Engines, Nozzles and Turbines
In fire tube boilers

Water passes through the tubes which are surrounded by flames and hot gases
The flames and hot gases pass through the tubes which are surrounded by water
Forced circulation takes place
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The diagram factor is the ratio of the

Actual workdone per stroke to the theoretical workdone per stroke
Actual mean effective pressure to the theoretical mean effective pressure
Area of the actual indicator diagram to the area of theoretical indicator diagram
Any one of the above

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