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Electrical Machines

Electrical Machines
Reactive power generated or delivered significantly depends on

 frequency.
 excitation.
 load angle.
 both 1 and 2.

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Split phase.
  Capacitor run.
  Capacitor start.
  Shaded pole.

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

  None of these.
 220.4 volt.
  120 volt.
  218.5 volt.

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 90o.
 0o.
 Greater than 90o.
 less than 90o.

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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
 1450W
 1820W
 2000W

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Electrical Machines
Armature coil is short circuited by brushes when it lies

  along field axis.
  in none of above positions.
  along neutral axis.
  in any of above positions.

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MORE MCQ ON Electrical Machines

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