Question

The armature winding of a 2-pole, 3-phase alternator for each phase is distributed in a number of slots per phase. The RMS value of the voltage per phase is less than the RMS value of the voltage per coil multiplied by the number of coils in series because the _________

(a) RMS value of the voltage in different coils of the phase is different

(b) equal RMS voltages in different coils of the phase has mutual phase difference

(c) maximum value of the induced voltage in different coils of the phase are different

(d) different coils of the phase pass through different saturated regions of the magnetic circuit

The question was asked during a job interview.

My doubt stems from EMF Polygon in division Synchronous Machines of Electrical Machines

Answer 1

The correct choice is (b) equal RMS voltages in different coils of the phase has mutual phase difference

Easy explanation: The phase displacement will be given by slot angular pitch γ.