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

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

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Steam Boilers, Engines, Nozzles and Turbines
The theoretical indicator diagram of a simple steam engine is based upon the assumption that

The expansion (or compression) of the steam is hyperbolic
Steam is admitted at boiler pressure and exhausted at condenser pressure
There is no pressure drop due to condensation
All of these

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