Electrical Machines
Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator?

 Dummy coils.
 Equalizer rings.
 Eye bolt.
 Commutator.

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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

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

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