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Electrical Machines

Electrical Machines
Which of the following induction motor has maximum speed?

 8 pole.
  2 pole.
 6 pole.
 4 pole.

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Electrical Machines
Two transformers operating in parallel will share the load depending on their

 efficiency
 ratings
 leakage reactance
 per unit impedance

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 50, 1500.
 1440, 1500.
 60, 1440.
  60, 1500.

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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of

  repulsion start induction motor.
  capacitor start induction motor.
  synchronous motor.
  transformer with secondary short circuited.

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Electrical Machines
Methods of synchronizing of alternator may be done by

 all bright lamp method.
  all of these.
 one dark two bright.
 all dark lamp method.

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  always closed.
  semi closed or semi opened.
  always opened.
  none.

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