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Electrical Machines

Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  50 Hz.
  16.67 Hz.
  60 Hz.
  25 Hz.

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Electrical Machines
Which of the following rotor requires damper winding?

 Salient pole rotor.
 Cylindrical rotor.
 Both type rotor.
None of these

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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

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

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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

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

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Electrical Machines
The heat generated in the transformer is dissipated mainly by

  convection.
 radiation.
All of these
 conduction.

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 RBY
 BRY
 BYR
All of these

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