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Question
Flywheel is an important part of a steam engine because it :
Options:
A .  Accelerates the speed of the engine
B .  Helps the engine in keeping the speed uniform
C .  Decreases the moment of inertia
D .  Gives strength to the engine
Answer: Option B
A flywheel is a rotating mechanical device that is used to store rotational energy. Flywheels have a significant moment of inertia and thus resist changes in rotational speed, enabling the engine to run at a constant, uniform motion. In the Industrial Revolution, James Watt contributed to the development of the flywheel in the steam engine.

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