Steam Boilers, Engines, Nozzles and Turbines
The purpose of governing in steam turbines is to

Completely balance against end thrust
Reduce the effective heat drop
Maintain the speed of the turbine
Reheat the steam and improve its quality

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

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