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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

 3 to 5.
 1.0.
  1.5 to 2.
 2 to 3.

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

  0.23Ω.
 0.5Ω.
 1Ω.
 0.25Ω.

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  synchronous motor.
  repulsion motor type starting.
  transformer with short-circuited secondary.
  capacitor run IM.

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Electrical Machines
In case of a compensated DC series motor, the compensating winding is provided

 In parallel with the field winding.
  In series with the armature winding.
 As a separate unit.
 In parallel with the armature winding.

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Electrical Machines
Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator?

 Equalizer rings.
 Eye bolt.
 Commutator.
 Dummy coils.

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Electrical Machines
Series booster is a

 separately excited DC generator.
  series wound DC generator.
 shunt wound DC generator.
 permanent magnet DC generator.

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