Steam Boilers, Engines, Nozzles and Turbines
The effect of friction on the flow of steam through a nozzle is to

Increase the mass flow rate and to increase the exit temperature
Increase the exit temperature without any effect on mass flow rate
Decrease the mass flow rate and to increase the wetness of steam
Decrease the mass flow rate and to decrease the wetness of steam

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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

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

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