Question 57Electricity & Electronics - Assistant Engineer

The correct answer is B) the strength of the rotating magnetic field. The amount of RMS voltage induced in the windings of an AC generator operating at a constant 60 Hz frequency is determined by several factors, as listed in the question. However, the only factor that is variable during generator operation is the strength of the rotating magnetic field. This is because the strength of the magnetic field generated by the field coils can be adjusted to control the generator's output voltage. The other factors - the number of armature coil turns, the rotational speed, and the number of field coil turns - are typically fixed or predetermined during the generator's design and construction, and do not change during normal operation.