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Phasor diagram below is best describing the __________

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Phasor diagram below is best describing the __________

(a) Open circuit characteristic of alternator

(b) Short circuit characteristic of alternator

(c) External circuit characteristic of alternator

(d) Internal circuit characteristic of alternator

This question was posed to me in homework.

Question is taken from Phasor Diagram of a Cylindrical Rotor Alternator topic in portion Synchronous Generators of Electrical Machines

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Right answer is (a) Open circuit characteristic of alternator

The best explanation: Graph of Ef vs Ff is the open circuit characteristic of the machine.

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