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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 100 Hz
 0 Hz
 25 Hz
 50 Hz

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Electrical Machines
Drop in speed from no load to full load is very high in

 Shunt motor with interpoles.
 Cummulative compound motor with interpoles.
  Series motor without interpoles.
 Series motor with interpoles.

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 0.72.
 0.62.
 0.25.
 1.24.

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

 two.
 zero.
  unity.
 infinity.

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Electrical Machines
Lap winding is prefered for which type of machines?

 high current and low voltage
 high current and high voltage
 low current and low voltage
 low current and high voltage

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Electrical Machines
Unbalance 3 - Φ stator currents cause

  double frequency currents in the rotor.
All of these
  vibrations.
  heating of rotor.

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MORE MCQ ON Electrical Machines

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