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In three phase supply, the voltage phases are displaced by ________ and in two phase by ___________

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In three phase supply, the voltage phases are displaced by ________ and in two phase by ___________

(a) 120°, 90°

(b) 180°, 90°

(c) 120, 120°

(d) 120°, 180°

This question was addressed to me by my college director while I was bunking the class.

The question is from Parallel Operation of Single Phase Transformers topic in portion Transformers of Electrical Machines

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Correct option is (a) 120°, 90°

For explanation: Displacement angle for m-phase system is 2*pi/m.

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