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Electrical Machines

Electrical Machines
The starting resistance of DC motor is generally

 around 500 ohms.
 Infinitely large.
  Low.
 1000 ohms.

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Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 70° to 85°
 90°
 25° to 30°
 0°

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/3, 1/3
 1/√3, 1/√3
 1/√3, 1/3
 1/3, 1/√3

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Synchronous motors.
  Universal motor.
  Slip ring induction motor.
  Reluctance motor.

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Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  sinusoidal.
  flat topped.
  pulsating.
 triangular.

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

 36°
 18°
 30°
 72°

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