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 heat actually used in producing steam to the heat liberated in the furnace
Ratio of the heat liberated in the furnace to the heat actually used in producing steam

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

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

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