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Electrical Machines

Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 400 V.
 420 V.
 350 V.
 480 V.

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  increasing of frequency.
  increasing number of poles.
  decreasing of frequency.
  speed can not be increased.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 96%
 94%
 92%
 95%

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Electrical Machines
A 3 - Φ slip ring motor has

  double cage rotor.
  short-circuited rotor.
  any of the above.
  wound rotor.

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

 100 V.
 50 V.
 399 V.
  230.2 V.

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

  3190 W, 5040 W.
 1000 W, 5040 W.
 6000 W, 7000 W.
 100 W, 2000 W.

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