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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

  40 A.
 400 A.
 440 A.
 44 A.

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

  230.2 V.
 50 V.
 399 V.
 100 V.

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Electrical Machines
An unexcited single phase synchronous motor is

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

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 there is no hard and fast rule for this.
 lie in the inter polar gaps.
 lie under north pole.
 lie under south pole.

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

 3 %.
None of these
 0 .001 %.
  3.33 %.

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Electrical Machines
In dc machine armature windings are placed on rotor because of the necessity for

 generation of voltage.
 commutation.
 development of torque.
 electromechanical energy conversion.

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MORE MCQ ON Electrical Machines

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