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Electrical Machines

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

 120°.
 60°.
 90°.
 30°.

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Electrical Machines
In DC generators brushes are used for

 reduce eddy current loss
 convert ac armature current in to dc
 collecting of current without any sparkings
 collecting of voltage

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Electrical Machines
What is the full form of MNP?

  Magnetic field neutral pole.
  Magnetic field neutral plane.
  Magnetic neutral plane.
  Magnetic neutral pole.

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T is independent of P.
 T2 ∝ P3.
 T ∝ P.
 T ∝ √P.

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Electrical Machines
The constant losses in transformer is/are

 eddy current loss.
 copper loss.
 hysteresis loss.
 both 2 and 3.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 1500 rpm
 1470 rpm
 30 rpm
 zero

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MORE MCQ ON Electrical Machines

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