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The equation for flux per pole Φ=4/PBplr, is valid for _____________

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The equation for flux per pole Φ=4/PBplr, is valid for _____________

(a) for salient pole rotor only

(b) for cylindrical pole rotor only

(c) for both cylindrical and salient pole rotor

(d) none of the mentioned

I got this question during an online exam.

Origin of the question is Terms Pertaining To Rotating Machines in section Basic Concepts in Rotating Machines of Electrical Machines

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Best answer
Correct option is (c) for both cylindrical and salient pole rotor

Best explanation: It does not make any difference whether the field winding is on cylindrical pole structure or salient pole structure.

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