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
None of these
To measure pressure of steam inside the steam boiler
To indicate the water level inside the boiler to an observer

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Steam Boilers, Engines, Nozzles and Turbines
A regenerative steam cycle renders

Increased work output per unit mass of steam
Decreased work output per unit mass of steam as well as increased thermal efficiency
Decreased work output per unit mass of steam
Increased thermal efficiency

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