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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.7.
  1.
 0.3.
  0.54.

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 more than 30 W
 zero watt
 30 W
 less than 30 W

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Differential compound motor.
  Shunt motor.
  Cumulative compound motor.
  Series motor.

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

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

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Electrical Machines
In a DC generator, the ripples in the direct emf generated are reduced by employing

  commutator with large number of segments.
  carbon brushes.
 graphite brushes.
  equalizer rings.

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Electrical Machines
For larger units high torque it is preferred to use

 Universal motor.
 DC shunt motor.
 Partial motor.
 Slip induction motor.

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