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

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

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Steam Boilers, Engines, Nozzles and Turbines
In fire tube boilers

Forced circulation takes place
The flames and hot gases pass through the tubes which are surrounded by water
None of these
Water passes through the tubes which are surrounded by flames and hot gases

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