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Electrical Machines

Electrical Machines
Dynamic braking can be used for

All of these
 shunt motors.
 compound motors.
 series motors.

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Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases
 increases.
 decreases.
 remains constant.

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Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  none of these.
  linear.
  cage.
  wound.

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Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is

 ineffective.
 cross – magnetizing.
  demagnetizing.
 magnetizing.

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Electrical Machines
Maximum power will be developed when back emf is

 half of the supply voltage.
 double the supply voltage.
All of these
 equal to supply voltage.

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

  crawling.
  skewing.
  slip.
  cogging.

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MORE MCQ ON Electrical Machines

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