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Electrical Machines

Electrical Machines
Eb/V ratio of a DC motor is an indication of

  Effiency.
 Running Torque.
 Starting torque.
 Speed regulation.

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 turn- ratios are exactly equal
 KVA ratings are equal
 polarities are properly connected
 percentage impedances are equal

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 damping torque.
  restoring torque.
 synchronizing power co efficient.
 mechanical rotatory system.

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

  2 - s.
 1 - s.
  s.
 2 + s.

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 supply voltage control
All of these
 armature circuit resistance control
 field current control

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Electrical Machines
Which of the following represents the pitch factor?

 Cos (α/2)
 Cos α
 Cos α²
 sin (α/2)

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MORE MCQ ON Electrical Machines

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