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Electrical Machines

Electrical Machines
Flux density under trailing pole tips in case of generator will

None of these
 either increase or decrease
 decrease
 increase

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

  cross-magnetization as well as demagnetization.
  none of above.
 demagnetisation.
  cross-magnetisation.

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 remain unchanged
 be 12.5%
 be more than 10%
 be less than 10%

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increase the iron loss
 increases the design cost
All of these
 increase the maintenance and repair

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  By varying number of poles.
  By varying the supply frequency.
  By varying supply voltage.
  Both (A) and (B).

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Electrical Machines
The three point starter is used for

  Shunt motor as well as compound motors.
  Shunt, compound and series motor.
  Series motor.
  Shunt motor.

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