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Electrical Machines

Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 18°
 30°
 72°
 36°

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Electrical Machines
In case of IM the torque is

  directly proportional to slip2.
  directly proportional to slip.
  inversely proportional to slip.
  inversely proportional to √slip.

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f²
 f
 V²
 V

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Electrical Machines
In salient pole synchronous machine, if direct axis reactance and quadrature axis reactance is equal, then power developed due to reluctance is

 any of the above
 zero
 infinite value
 maximum

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Electrical Machines
No load test on induction motor is conducted to find which of the following losses?

 Rotational loss
 Stator core loss
 Stator copper loss
All of these

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Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

 zero.
 proportional to square of rotor speed.
  proportional to rotor speed.
 constant independent of speed.

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MORE MCQ ON Electrical Machines

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