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Electrical Machines

Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 18°
 72°
 30°
 36°

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Electrical Machines
Dynamic braking is employed to brake

 non reversing drive
None of these
 both 1 and 2
 reversing drive

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

  region under main pole.
None of these
 throughout the air gap.
 interpole region.

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Electrical Machines
An unexcited single phase synchronous motor is

  universal motor.
 repulsion motor.
 reluctance motor.
 AC series motor.

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Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 37
 36
 74
 72

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

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

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