Steam Boilers, Engines, Nozzles and Turbines
The diagram efficiency is the ratio of

Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
None of these
Workdone on the blades to the energy supplied to the blades
Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam

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

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