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Electrical Machines

Electrical Machines
The flux involved in the emf equation of a transformer has

 rms value.
  maximum value.
 average value.
 total value.

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 any of above.
 severe sparking.
 rough commutator surface.
 imperfect contact.

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

  decreases.
 increases.
  increases upto a limit and then remains almost constant.
  remains constant.

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

 1.5 %.
  30 %.
  2.67 %.
 5 %.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 transformer insulating oil.
 steel core in transformer.
 iron made tank of transformer.
 winding of transformer.

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Electrical Machines
An unexcited single phase synchronous motor is

 reluctance motor.
  universal motor.
 repulsion motor.
 AC series motor.

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