Steam Boilers, Engines, Nozzles and Turbines
The cylinder dimensions of a compound engine may be designed on the basis of

Equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders
Equal temperature drop in each cylinder for economy of steam
All of these
Equal power developed in each cylinder for uniform turning moment

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

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

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