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

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

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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

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

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