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Electrical Machines

Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 zero.
 leading.
 unity.
  lagging.

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

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

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Electrical Machines
Poles of DC machine are often laminated to

 reduce pulsation loss.
 dissipate more heat.
 reduce armature reaction.
 reduce iron weight.

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Electrical Machines
Which of the following relation is correct?

 Xd > Xq.
 Xd < Xq.
 Xd = Xq.
None of these

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Electrical Machines
The emf induced in the dc generator armature winding is

 AC
None of these
 AC and DC
 DC

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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of

  transformer with secondary short circuited.
  capacitor start induction motor.
  repulsion start induction motor.
  synchronous motor.

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