Steam Boilers, Engines, Nozzles and Turbines
The aim of a compound steam engine is

To reduce the ratio of expansion in each cylinder
To reduce the temperature range in each cylinder
All of these
To reduce the length of stroke

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

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

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