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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 25 Hz
 50 Hz
 100 Hz
 0 Hz

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

 armature reaction.
 presence of commutator.
  reactance voltage.
 high resistance of carbon brushes.

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  zero.
  220 V.
  about 50 V.
  about 2 V.

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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 1.0.
  1.5 to 2.
 3 to 5.
 2 to 3.

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Electrical Machines
Inter pole winding is connected in-------------------------- ?

 parallel with armature
 parallel with main poles
 series with armature
 series with main poles

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

  40 V.
 0 V.
 20 V.
 60 V.

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MORE MCQ ON Electrical Machines

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