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Electrical Machines

Electrical Machines
Which of the following induction motor has maximum speed?

 4 pole.
 6 pole.
  2 pole.
 8 pole.

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  reduces generator emf.
  results in sparking trouble.
  increases armature speed.
  reduces inter poles flux density.

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Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 40%
 19%
 10%
 5%

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Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

  proportional to rotor speed.
 zero.
 constant independent of speed.
 proportional to square of rotor speed.

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Armature resistance control.
 Field diverter control.
 Field control.
 Armature voltage control.

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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

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

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