A 3-phase induction machine is running at super synchronous speed. For the machine to be self excited it _________
(a) draws reactive power from mains
(b) draws real power from mains
(c) feeds reactive power to mains
(d) generates emf by gradual voltage build up
I had been asked this question in an internship interview.
Asked question is from Equivalent Circuit in chapter Induction Machines of Electrical Machines