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Electrical Machines

Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 100
 50
 1
 10

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Electrical Machines
Universal motors are used in

All of these
 traction
 food processing
 cranes

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 4 and 2
 2 and 2
 4 ang 1
 2 and 1

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Normal.
 Very low.
 Zero.
 Very high.

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

 zero.
 unity.
 leading.
  lagging.

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Electrical Machines
The stator core of a 3 - Φ induction motor is laminated in order to reduce the

  eddy current loss.
  weight of the stator.
  both of the above.
  hysteresis loss.

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