Derive from the first principles the equation of induced E.M.F in armature windings of an alternator.
(b) A 60-Kva 220V,50-Hz single phase alternator has effective armature resistance of 0.016Ω and an armature leakage reactance of 0.07Ω.Calculate the voltage induced in the armature when the alternator is delivering rated current at a load power factor of;
(i)Unity
(ii) 0.7 lagging
(iii) 0.7 leading
(c)What are the advantages of using fractional-pitch coils in the armature of an alternator.