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Electrical Machines

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

 30°
 18°
 72°
 36°

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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

 212 V.
 205 V.
 210 V.
  201.02 V.

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Electrical Machines
Regenerative braking is possible in

 DC series motor.
 DC shunt motor with armature resistance control.
  DC shunt motor with field weakening control.
 DC compound motor.

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Electrical Machines
Which motor used in Lathe machine?

None of these
  D.C . series motor.
  D.C. shunt motor.
  D.C. cumulative compound motor.

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Electrical Machines
In a three phase slip-ring induction motor, brushes are connected to

  equalizing coils.
  3 - Φ AC supply.
  external star-connected resistors.
  DC supply.

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Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 increases.
 decreases.
None of these
 remains same.

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