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Electrical Machines

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 low and high
 high and low
 low and low
 high and high

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

None of these
  residual magnetism.
 armature reaction.
  permanent magnets.

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  1.0.
  0.05.
  0.1.
  0.5.

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Electrical Machines
Which of the following motors has low ratings only?

 Resistance split phase
 Capacitor start
 Capacitor run
 Shaded pole

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Electrical Machines
Compensating winding is placed in the

 pole shoe
All of these
 armature core
 main field

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Electrical Machines
In 3 - Φ induction motor some times copper bars are placed deep in the rotor to

  improve efficiency.
  improve starting torque.
  reduce copper loss.
  improve power factor.

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MORE MCQ ON Electrical Machines

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