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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 650 W
 600 W
 625 W
 700 W

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Electrical Machines
Which of the following voltage regulation method is accurate ?

 ZPF method
 Synchronous impedance method
 MMf method
 American standard association method

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Electrical Machines
A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is

 1203
 1080
 1000
 1200

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

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

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

  rotor at slip rings.
  stator phases of the motor.
  starting resistance in the starter.
None of these

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Electrical Machines
Hysteresis loop represents the area of

 eddy current loss
 hysteresis loss
 copper loss
 total iron losses

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