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Electrical Machines

Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

 (1/2)Fmax.
  (3/2)Fmax.
 Fmax.
 3Fmax.

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Electrical Machines
Which of the following motors has low ratings only?

 Shaded pole
 Resistance split phase
 Capacitor run
 Capacitor start

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Electrical Machines
For same HP rating and full load speed which of following motor has poor starting torque?

 Shunt.
 Cummulative compound.
 Series.
 Differently compounded.

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

 50Hz
 1 Hz
 2.5Hz
 2HZ

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Electrical Machines
The armature of DC motor is laminated

 to reduce the eddy current loss.
 to reduce the hysteresis loss.
 to reduce the inductor.
 to reduce the mass.

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 1/2 of the initial value
 1/4 of the intial value
 twice the initial value
 4 time the initial value

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