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

Ratio of the heat liberated in the furnace to the heat actually used in producing steam
None of these
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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Steam Boilers, Engines, Nozzles and Turbines
The equivalent evaporation is defined as

The evaporation of 15.653 kg of water per hour from and at 100°C
The ratio of heat actually used in producing the steam to the heat liberated in the furnace
The amount of water evaporated from and at 100°C into dry and saturated steam
The amount of water evaporated or steam produced in kg per kg of fuel burnt

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