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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 S.Ns
 Ns
 Zero
 Nr

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Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 120°.
 60°.
 30°.
 90°.

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

 2HZ
 2.5Hz
 50Hz
 1 Hz

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

  Transistor shunt regulator.
  Zener diode shunt regulator.
  Transistor series regulator.
None of these

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

 cooling the armature.
  reducing the load voltage.
  increasing the excitation.
  increasing the input to the prime mover.

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Electrical Machines
Armature reaction in dc motor results

  open circuit.
  increase in speed.
  decrease in speed.
  short circuit.

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MORE MCQ ON Electrical Machines

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