Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

  66.91 V.
 76.91 V.
 56.91 V.
 86.91 V.

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Electrical Machines
In a synchronous generator with constant steam input supplies power to an infinite bus at a lagging power factor. If the excitation is increased

 both power angle and power factor increase
 power angle increase and power factor decrease
 both power angle and power factor decrease
 power angle decrease and power factor increase

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