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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 90°.
 120°.
 30°.
 60°.

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

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

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Electrical Machines
For standing a DC motor a starter is required because

None of these
  it limits the starting current to a safe value.
  It starts the motor.
  it limits the speed of the motor.

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 800 V.
 400 V.
 200 V.
 100 V.

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Bl2v2.
 Blv2.
 Blv.
 Bl2v.

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Electrical Machines
In DC generator, brushes are always placed along

 geometrical neutral axis.
  magnetic neutral axis.
 armature axis.
 load axis.

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MORE MCQ ON Electrical Machines

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