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Electrical Machines

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

 Ns
 Nr
 S.Ns
 Zero

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Electrical Machines
In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.

 remain the same.
 increase
 decrease.
 be unpredictable.

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Electrical Machines
In escalator which motor is used?

  1 - φ IM.
  Universal motor.
  DC shunt motor.
  3 - φ IM.

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

All of these
 to achieve a stronger magnetic field.
 to avoid locking of the armature.
 to avoid over heating.

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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 57.1%.
 59.2%.
 48.0%.
 88.8%.

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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

 same
 either of these
None of these
 exactly opposite

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MORE MCQ ON Electrical Machines

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