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Electrical Machines

Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

  1.5 to 2.
 1.0.
 2 to 3.
 3 to 5.

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

None of these
  On yoke in the pole faces.
 On armature.
 On yoke in the inter pole gap.

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Nr
 Zero
 S.Ns
 Ns

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

  Increases.
 Decreases.
 None of above.
 Remains unchanged.

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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 30 W.
 25 W.
 36 W.
 28 W.

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Electrical Machines
High starting torque and low starting current is the advantage of

  hysteresis motor.
  stepper motor.
  squirrel cage induction motor.
  slip ring induction motor.

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MORE MCQ ON Electrical Machines

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