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Electrical Machines

Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 6 / 7.
 5 / 6.
  4 / 5.
 2 / 3.

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Electrical Machines
Dynamic braking is very effective for

 shunt motors.
 differential compound motors.
 separately excited motors.
 series motors.

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 zero or very low voltage supply.
 all of these.
 over load.
 high filed circuit resistance.

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Small and constant load.
  Over-loading for long period.
  Over-excitation.
  Periodic variation of load.

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Squirrel cage induction motor.
 Slip ring induction motor.
 Same in both induction motors.
None of these

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2.5Hz
 1 Hz
 50Hz
 2HZ

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MORE MCQ ON Electrical Machines

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