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Electrical Machines

Electrical Machines
which of the following losses are negligible in blocked rotor test?

 iron loss
 both A and B
 copper loss
 mechanical loss

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 6 / 7.
 5 / 6.
  4 / 5.
 2 / 3.

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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

 increased.
 kept constant to certain value.
 decreased.
  remains unchanged.

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Electrical Machines
Satisfactory commutation of DC machine requires

 brushes should be of proper grade and size.
 smooth, concentric commutator properly undercut.
All of these
 brushes should smoothly run in the holders.

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 core loss only
 windage and friction loss
 both 1 and 2
 Copper loss

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Electrical Machines
Series generators are used in which of the following applications?

 Arc welding.
All of these
 Used as boosters in dc distribution or transmission.
 Air crafts.

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