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Electrical Machines

Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 30.
 45.
 180.
  270.

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

 4 and 2
 4 ang 1
 2 and 2
 2 and 1

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Electrical Machines
Total core loss is also called as -------------?

 Magnetic loss
 Copper loss
 Eddy current loss
 Hysteresis loss

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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

 1, 3
 2, 3
 2, 4
 1, 4

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Electrical Machines
Capacitor in split phase induction motor is used to

 start the motor.
 improve the starting torque.
 reduce the harmonics.
 improve the power factor.

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Electrical Machines
An IM cannot run at synchronous speed because

  none of above.
  air friction will prevent it.
  induction motor will become synchronous motor.
  rotor torque will not be produced.

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