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Electrical Machines

Electrical Machines
In an induction motor, the no-load slip is generally equal to

  less than 1 %.
  zero.
 4 %.
 1.5 %.

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Electrical Machines
Wave winding is employed in DC machine of

 high current and low voltage rating.
 high current and low voltage rating.
  low current and high voltage rating.
 low current and low voltage rating.

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Electrical Machines
Drop in speed from no load to full load is very high in

 Series motor with interpoles.
  Series motor without interpoles.
 Shunt motor with interpoles.
 Cummulative compound motor with interpoles.

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Electrical Machines
Generator works on the principle of production

 static induced emf.
None of these
 both A and B.
 dynamically induced emf.

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 200V
 10V
 100V
 20V

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Commutating pole winding.
 Both Compensating and Commutating pole winding.
 Auxiliary winding.
 Compensating winding.

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