An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50 Hz, the electromotive force (e.m.f.) in the rotor will have a frequency of:

If the no-load voltage of a generator is 210 V and its full-load rated voltage is 200 V, what is its voltage regulation percentage?

Calculate the number of poles of a synchronous motor operating at a synchronous speed of 1200 rpm with a supply frequency of 60 Hz.