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For a 3 phase synchronous generator of terminal voltage as 1 pu and field excitation of 1.2 pu. If the resistive drop is 0.2 pv, then what can be concluded for power factor?

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For a 3 phase synchronous generator of terminal voltage as 1 pu and field excitation of 1.2 pu. If the resistive drop is 0.2 pv, then what can be concluded for power factor?

(a) upf

(b) zpf

(c) lagging pf

(d) leading pf

The question was asked at a job interview.

Question is taken from Power Flow Through an Inductive Impedance in section Efficiency and Regulation of Electrical Machines

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Right answer is (a) upf

For explanation: The Value for Ef-Ia*ra = Vt; Here it is Vt = 0. So it is upf.

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