Steam Boilers, Engines, Nozzles and Turbines
The equivalent evaporation of a boiler is a measure to compare

Two different makes of boilers operating under the same operating conditions
The two different boilers of the same make
Any type of boilers operating under any conditions
The given boiler with the model

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Steam Boilers, Engines, Nozzles and Turbines
The relative efficiency is defined as the

Ratio of heat equivalent to indicated power to the energy supplied in steam
Product of thermal efficiency and Rankine efficiency
Ratio of thermal efficiency to Rankine efficiency
Ratio of brake power to the indicated power

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