Steam Boilers, Engines, Nozzles and Turbines
The cylinder condensation or missing quantity may be reduced by

All of these
Superheating the steam supplied to the engine cylinder
The efficient steam jacketing of the cylinder walls
Keeping the expansion ratio small in each cylinder

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

None of these
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

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