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Electrical Machines

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

  Effiency.
 Speed regulation.
 Starting torque.
 Running Torque.

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 2, 3, 4
 1, 2, 5
 1, 2, 3, 4
 1, 3, 5

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Peaky in nature.
 Triangular and directed towards main pole.
 Saddle shape.
 Triangular and directed towards brush axis.

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

None of these
  star.
  delta or star according to need.
  delta.

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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?

 DC Shunt Motor
 Synchronous motor.
 AC single phase motor.
 Induction motor.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

None of these
 either of these.
 decrease.
 increase.

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MORE MCQ ON Electrical Machines

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