Steam Boilers, Engines, Nozzles and Turbines
In a single acting steam engine

The steam is admitted on one side of the piston and one working stroke is produced during each revolution of the crankshaft
The steam is admitted, in turn, on both sides of the piston and one working stroke is produced during each revolution of the crankshaft
The steam is admitted, in turn, on both sides of the piston and two working strokes are produced during each revolution of the crankshaft
The steam is admitted on one side of the piston and two working strokes are produced during each revolution of the crankshaft

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Steam Boilers, Engines, Nozzles and Turbines
In an impulse turbine

The pressure and temperature of steam remains constant
The steam is expanded both in fixed and moving blades continuously
The steam is expanded in moving blades only
The steam is expanded in nozzles only and there is a pressure drop and heat drop

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