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Electrical Machines

Electrical Machines
Rotating part of DC motor is known as

 Starter.
 Carbone brush.
 Armature.
 Pole.

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Doubled.
 Four times.
 Remains same.
 Eight times.

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.75 p.u
  0.125 p.u
  0.5 p.u
  0.25 p.u

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 torque but not the voltage
 neither the voltage nor the torque
 voltage but not the torque
 both the torque and voltage

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Electrical Machines
Which of the following DC Motor requires 3 point starter?

  Series motor.
  Shunt, compound and series motor.
  Shunt motor as well as compound motors.
  Shunt motor.

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Electrical Machines
Capacitor start capacitor run provides

  high power factor only.
  high staring torque and high power factor.
  none.
  high staring torque only.

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MORE MCQ ON Electrical Machines

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