Steam Boilers, Engines, Nozzles and Turbines
The function of a safety valve is

To blow off steam when the pressure of steam inside the boiler exceeds the working pressure
To indicate the water level inside the boiler to an observer
To measure pressure of steam inside the steam boiler
None of these

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

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