Discussion
Assertion (A): Compound generators in parallel need an equalizer connection.
Reason (R): The series field makes the load sharing unstable without it.
Select the correct option.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason explains the necessity. If one compound machine takes a slightly larger share of the load, the extra current strengthens its series field, raises its emf, and makes it take more still - a runaway that ends with one machine motoring the other. The equalizer bar connects the series field junctions of the two machines so that the series fields see a common current, removing the positive feedback and making the sharing stable.
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