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Electrical Machines

Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  wound.
  cage.
  none of these.
  linear.

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

 induced voltage is high.
  rate of change of flux is maximum.
 rate of change of flux is minimum.
 shaft rotation is high.

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Electrical Machines
The output indicate on the name plate of any motor is always the

  Output power at the shaft.
 Power drawn in KVA.
 Power drawn in KW.
 Gross power.

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 AC single phase motor.
 Synchronous motor.
 Induction motor.
 DC Shunt Motor

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Electrical Machines
The effect of ------------------ on main field flux is armature reaction?

All of these
 armature flux
 armature current
 armature mmf

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Electrical Machines
Which of the following rotor requires damper winding?

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

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