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Electrical Machines

Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 36°
 30°
 72°
 18°

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Electrical Machines
Which motor cannot be started on no load?

 both B and C
 shunt motors
 cumulative compound motors
 series motors

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Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 40 HZ
 25 Hz
 50 Hz
 60 Hz

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Electrical Machines
Diverters are used only in

 either of these
None of these
 shunt motors
 series motors

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Electrical Machines
Lamination of transformer core is made of

  silicon steel.
 wrought iron.
  cast iron.
 cast steel.

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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

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

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