Steam Boilers, Engines, Nozzles and Turbines
The function of a flywheel is

To prevent fluctuation of speed
To convert reciprocating motion of the piston into rotary motion
To keep the engine speed uniform at all load conditions
To convert rotary motion of the crankshaft into to and fro motion of the valve rod

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

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

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