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From the OCC and SCC curves, what does the intercept AB represent?

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From the OCC and SCC curves, what does the intercept AB represent?

(a) Armature reaction

(b) Leakage reactance

(c) Armature copper losses

(d) Sum of armature reaction and leakage reactance

This question was addressed to me in class test.

The query is from Phasor Diagram of a Cylindrical Rotor Alternator topic in chapter Synchronous Generators of Electrical Machines

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Correct choice is (a) Armature reaction

Easiest explanation: It is armature reaction which is calculated based on Potier triangle.

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