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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  make noise.
  run normally.
  not run.
  get over heated.

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia2.
  √Ia.
  1/Ia.
  Ia.

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Electrical Machines
A DC series motor has which of the following characteristics?

 Can be started easily without load.
 Has a almost constant speed.
 Has a poor torque.
 Has its field winding consinting of thick wire and less no of turns.

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Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Speed regulation.
 Running Torque.
 Starting torque.
  Effiency.

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 reduce by 5 %.
 increase by 5 %.
 remain unchanged.
 depend on other factors.

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Electrical Machines
Voltage regulation can be determined by which of the following?

 Synchronous impedance method.
 MMf method.
All of these
 ZPF method.

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MORE MCQ ON Electrical Machines

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