Question

Flywheel is an important part of a steam engine because it -; 1) gives strength to the engine; 2) accelerates the speed of the engine; 3) helps the engine in keeping the speed uniform; 4) decreases the moment of inertia

Answer 1

helps the engine in keeping the speed uniform is your answer

Answer 2

3) helps the engine in keeping the speed uniform;

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Flywheel is an important part of a steam engine because it  helps the engine in keeping the speed uniform;