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Electrical Machines

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

 92%
 96%
 94%
 95%

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Electrical Machines
Which of the following motor is used in grinders?

  Synchronous motor.
  Split phase IM.
  Capacitor start IM.
  Capacitor start capacitor run IM.

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 50, s = 4.43 %.
  P = 40, s = 5.79 %.
  P = 60, s = 0.96 %.
  P = 20, s = 3.33 %.

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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 Series.
 Compound (cummolative).
  Shunt.
 none of these.

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Electrical Machines
The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ?

 14.28%.
 15.30%.
 18.25%.
 16.67%.

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  1440 to 2880.
  720 to 920.
  500 to 720.
  375 to 500.

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