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

Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
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

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of a boiler is defined as

None of these
Ratio of the heat liberated in the furnace to the heat actually used in producing steam
Ratio of the mass of steam produced to the mass of total water supplied in a given time
Ratio of heat actually used in producing steam to the heat liberated in the furnace

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