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

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

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of a boiler is defined as

Ratio of the mass of steam produced to the mass of total water supplied in a given time
None of these
Ratio of the heat liberated in the furnace to the heat actually used in producing steam
Ratio of heat actually used in producing steam to the heat liberated in the furnace

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