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Electrical Machines

Electrical Machines
The output power of any electrical motor is taken from the

 Motor frame.
 Field.
 Coupling mounted on the shaft.
 Armature.

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Electrical Machines
Capacitor start capacitor run provides

  none.
  high staring torque and high power factor.
  high staring torque only.
  high power factor only.

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

None of these
  starting resistance in the starter.
  stator phases of the motor.
  rotor at slip rings.

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmax to Imax.
 Vmax to Imin.
 Vmin to Imax.
 Vmin to Imin.

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Produce sparking at brushes.
 Draw too much current.
  Develop excessive speed and damage itself.
 Open fuse or circuit breaker.

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

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

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MORE MCQ ON Electrical Machines

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