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Electrical Machines

Electrical Machines
Which motor cannot be started on no load?

 cumulative compound motors
 both B and C
 series motors
 shunt motors

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

 sinusoidal.
  triangular.
 rectangular.
 trapezoidal.

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to achieve a stronger magnetic field.
 to avoid over heating.
All of these
 to avoid locking of the armature.

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Electrical Machines
Induction motors have the advantage of

  less cost.
  all of below.
  less maintenance.
  simple in construction.

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Electrical Machines
A DC generator can be considered as

 prime mover.
 rectifier.
 rotating amplifier.
 power pump.

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Electrical Machines
The armature MMF waveform of a DC machine is

  rectangular.
  triangular.
  pulsating.
  sinusoidal.

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MORE MCQ ON Electrical Machines

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