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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 5 Hz
 1 Hz
 0 Hz
 50 Hz

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Electrical Machines
Why are capacitors used with large AC induction motor?

  Improve power level.
  Improve voltage level.
  Improve current level.
  Improve power factor.

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

 It will remain the same.
  It will be halved.
  It will be doubled.
  It will becomes four times.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 large and thick
 less and thick
 less and thin
 large and thin

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Electrical Machines
When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then

 I1 = I2
 I1 > I2
 I1 < I2
None of these

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

 shaft rotation is high.
 induced voltage is high.
 rate of change of flux is minimum.
  rate of change of flux is maximum.

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