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Electrical Machines

Electrical Machines
Field weakening control method is used for the _________ ?

 below rated speed
None of these
 both A and B
 above rated speed

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Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  Compound.
  None of them.
  Series.
  Shunt.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 1 Hz
 50 Hz
 5 Hz
 0 Hz

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Electrical Machines
Lamination of transformer core is made of

  silicon steel.
  cast iron.
 wrought iron.
 cast steel.

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Electrical Machines
Which of the following alternators contain large number of poles?

None of these
 Turbo alternators.
 Hydro alternators.
 Aame in both alternators.

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

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

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