Steam Boilers, Engines, Nozzles and Turbines
The theoretical indicator diagram of a simple steam engine is based upon the assumption that

There is no pressure drop due to condensation
All of these
The expansion (or compression) of the steam is hyperbolic
Steam is admitted at boiler pressure and exhausted at condenser pressure

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

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

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