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

 Commutator.
 Equalizer rings.
 Dummy coils.
 Eye bolt.

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Electrical Machines
If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then

 Ph will increase but Pe will decrease
 Ph will decrease but Pe will remain same
 Pe will increase but Ph will decrease
 both hysteresis loss(Ph) and eddy current loss(Pe) will increase

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