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An amplidyne, d-axis flux is always neutralized due to _________

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An amplidyne, d-axis flux is always neutralized due to _________

(a) compensating winding at all possible loads

(b) interpoles at all specified loading

(c) feedback at all possible loads

(d) feedback at fixed loading

This question was posed to me in unit test.

The query is from Rotating Amplifiers in portion DC Generators of Electrical Machines

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Correct answer is (a) compensating winding at all possible loads

For explanation: The d-flux is neutralized by compensating winding at all possible loads as the same flux will be produced but in the opposite direction so as to cancel the flux.

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