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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 1 Hz
 50Hz
 2HZ
 2.5Hz

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  None of above.
  Open slots.
  Closed slots.
  Semi closed slots.

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Electrical Machines
Transformer action requires a

 alternating magnetic lux.
 increasing magnetic flux.
 constant magnetic flux.
 alternating electric flux.

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Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 maximum
All of these
 minimum
 zero

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1920W
 2000W
 1820W
 1450W

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Electrical Machines
The oscillation in a synchronous motor can be damped out by

  oscillation cannot be damped.
  running the motor on leading power factors.
  providing damper bars in the rotor pole faces.
  maintaining constant excitation.

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