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

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

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Steam Boilers, Engines, Nozzles and Turbines
The indicated thermal efficiency is defined as the

Ratio of heat equivalent to indicated power to the energy supplied in steam
Ratio of thermal efficiency to the Rankine efficiency
Product of thermal efficiency and Rankine efficiency
Ratio of brake power to the indicated power

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