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Electrical Machines

Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f²
 f
 V²
 V

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

  residual magnetism.
  permanent magnets.
 armature reaction.
None of these

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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 6.
  8.
 4.
  2.

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 poor overall efficiency.
 high maintenance cost.
 high initial cost.
 all of above.

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  cogging.
  crawling.
  slip.
  skewing.

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

 starting torque.
 speed regulation.
 running torque.
 efficiency.

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