Steam Boilers, Engines, Nozzles and Turbines
The diagram efficiency is the ratio of

None of these
Workdone on the blades to the energy supplied to the blades
Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam

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

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Steam Boilers, Engines, Nozzles and Turbines
For water, at pressures below atmospheric;

Melting point drops slightly and boiling point drops slightly
Melting point drops slightly and boiling point drops markedly
Melting point rises slightly and boiling point drops markedly
Melting point rises markedly and boiling point drops markedly

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