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Electrical Machines

Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

  270.
 30.
 180.
 45.

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Electrical Machines
A 3 - Φ slip ring motor has

  short-circuited rotor.
  any of the above.
  double cage rotor.
  wound rotor.

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  over compounded.
  differential compounded.
  under-compounded.
  shunt.

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Electrical Machines
DC machine windings are

 short pitched
None of these
 full pitched
 either of these

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 1 V
 2 V
 4 V
 0 V

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 leading power factor.
 any of the above.
 lagging power factor.
 unity power factor.

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