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| Sr.No. | Governor | Flywheel |
|---|---|---|
| 1. | The function of a governor is to keep the variation in mean speed of the engine within prescribed limits due to fluctuations in load over a period of time. | The function of flywheel is to control the speed variations caused by the fluctuations of turning moment during a cycle. |
| 2. | Mathematically, a governor controls dN. | Mathematically, a flywheel controls. |
| 3. | A governor regulates the speed by regulating the quantity of charge of the prime mover. | A flywheel stores the energy and gives up the energy whenever required during a cycle. |
| 4. | It regulates the speed over a period of time. | It regulates the speed during one cycle only. |
| 5. | A governor takes care of quantity of working fluid. | A flywheel has no control over the quantity of charge. |
| 6. | It is an essential element of a prime mover since it does adjustment of supply of charge according to the load on the engine. | A flywheel is not an essential element for prime mover, it is only used when there are undesirable cyclic fluctuations of energy in output or input. |
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