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Electrical Machines

Electrical Machines
Hunting phenomenon is observed in which motor?

 DC motor.
  Synchronous motor.
 Induction motor.
 Both A and C.

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Series motor.
  Cumulative compound motor.
  Differential compound motor.
  Shunt motor.

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

  6.3 kW, 9.3 kW.
 5.7 kW, 8.7 kW.
 9.6 kW, 12 kW.
 9.3 kW, 9.3 kW.

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 all of above.
 provide execessive voltage drop in line.
 draw a starting current many times its rated full load current.
 damage the armature and commutator.

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

  Decreases.
 Increases.
 Oscillates around the rated speed.
 Remains unchanged.

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Electrical Machines
During no load test, an induction motor draws power

  for core loss and copper loss.
  only for the small copper loss.
  for core loss and windage and friction loss.
  for copper loss and windage friction loss.

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