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Electrical Machines

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

 6 pole.
 4 pole.
 8 pole.
  2 pole.

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Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.5 ohm.
 100 ohm.
 50 ohm.
  0.1 ohm.

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Ra maximum and Rf minimum
 Rf maximum and Ra minimum
 Ra minimum and Rf minimum
 Ra maximum and Rf maximum

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Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 21%
 41%
 10%
 11%

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Electrical Machines
The speed of rotation of 5th harmonic component in the stator of an induction motor is

  (1 / 5) times the synchronous speed.
 (1 / 15) times the synchronous speed.
 5 times the synchronous speed.
  0.5 times the synchronous speed.

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 run at very high speed.
 burn.
 start haunting.
 run at very low speed.

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