Question

When is the shape of the negative half of the emf waveform equal to the positive half?

(a) When the conductors move past north pole

(b) When conductors move past south pole

(c) When conductors move past both north and south pole

(d) When conductors are stationary

I got this question during an online exam.

I need to ask this question from Relationship between Frequency, Speed and Number of Pole Pairs in portion Alternating Voltage and Current of Basic Electrical Engineering

Answer 1

Correct answer is (c) When conductors move past both north and south pole

Explanation: The waveform of the e.m.f. generated in an a.c. generator undergoes one complete cycle of variation when the conductors move past an N and an S pole and the shape of the wave over the negative half is exactly the same as that over the positive half.