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Electrical Machines

Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  None of them.
  Compound.
  Shunt.
  Series.

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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

 205 V.
  201.02 V.
 212 V.
 210 V.

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Ward-Leonard control.
 Multiple voltage control.
 Field control.
 Armature control.

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

 None of above.
  Increases.
 Decreases.
 Remains unchanged.

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  slip.
  skewing.
  crawling.
  cogging.

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Electrical Machines
The oscillation in a synchronous motor can be damped out by

  providing damper bars in the rotor pole faces.
  oscillation cannot be damped.
  maintaining constant excitation.
  running the motor on leading power factors.

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