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Electrical Machines

Electrical Machines
If input of a transformer is square wave the output will be

 sine wave.
 triangular wave.
 square wave.
  pulsed wave.

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Electrical Machines
In a synchronous motor, damper windings are provided on

  pole faces.
None of these
  stator frame.
  rotor shaft.

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  synchronous motor torque.
  induction generator torque.
  DC motor torque.
  induction motor torque.

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

All of these
 maximum
 zero
 minimum

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Electrical Machines
Under commutation results in

  sparking the trailing edge of the brush.
  sparking at the leading edge of the brush.
  sparking at the middle of the brush.
  no sparking.

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

  the rotating stator flux and rotor flux.
  the supply voltage and the back emf.
None of these
  magnetizing electric current and back emf.

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MORE MCQ ON Electrical Machines

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