Steam Boilers, Engines, Nozzles and Turbines
The nozzle efficiency is the ratio of

Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
Workdone on the blades to the energy supplied to the blades
Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
None of these

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

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

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