Discussion
Assertion (A): A flywheel cannot equalise the load on a synchronous motor.
Reason (R): Energy exchange with a flywheel requires the speed to change.
Select the correct option.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. A flywheel gives up energy only by slowing down, since \( \Delta E = \tfrac{1}{2}J\Delta(\omega^2) \). A synchronous motor is locked to the supply frequency and cannot slow at all, so no energy can be drawn from the flywheel and none returned to it. Load equalisation by flywheel therefore requires a machine with a drooping characteristic - an induction or a dc machine.
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