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Electrical Machines

Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 37
 72
 36
 74

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

 220 V.
 225 V.
  222 V.
 230 V.

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to reduce eddy current loss.
  to reduce hysteresis loss.
  to provide better flux linkage.
  to reduce mechanical losses.

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  V connection.
  zig - zag connection.
  delta connection.
  star connection.

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 improve and the speed rises.
 improve and the speed falls.
 deteriorate and the speed rises.
 deteriorate and the speed falls.

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Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

 None of these.
 Heavy sparking at brushes.
 Heavy sparking at the first stud of starting resistance steps.
 Both of above.

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