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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  run normally.
  make noise.
  get over heated.
  not run.

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Electrical Machines
What is/are the advantages of parallel operation of alternators?

 Increase efficiency under light load conditions
 Increase in reliability
 continuity supply is maintained
All of these

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 reversing the terminals of main winding.
 interchanging the capacitor from starting winding to main winding or vice versa.
 reversing the terminals of starting winding.
All of these

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Electrical Machines
Cross magnetization effects which of the following?

 both 2 and 3
 commutation
 reduces the terminal voltage
 reduction in main field flux

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Electrical Machines
Width of a carbon brush should be equal to

 less than the width of commutator segment.
 the width of the 1 to 2 commutator segment.
 the width of the 2 to 3 commutator segment.
 the width more than 3 commutator segment.

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Capacitor run.
  Capacitor start.
  Split phase.
  Shaded pole.

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MORE MCQ ON Electrical Machines

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