Steam Boilers, Engines, Nozzles and Turbines
In recuperative air preheaters, the heat is transferred

Heat is transferred by bleeding some gases from furnace
From heating an intermediate material and then heating the air from this material
By direct mixing
From a metal wall from one medium to another

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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
The expansion (or compression) of the steam is hyperbolic
All of these
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

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
Any type of boilers operating under any conditions

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