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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

  speed and voltage.
  load.
 speed.
  voltage.

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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.
None of these
  starting resistance in the starter.

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Electrical Machines
Unbalance 3 - Φ stator currents cause

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

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Electrical Machines
Alternator operates on the principle of

  mutual induction.
  self induction.
  electromagnetic induction.
  self or mutual induction.

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Electrical Machines
In synchronous generator V curve is drawn between

 field current on Y-axis and armature current on X-axis.
 field current on X-axis and armature current on Y-axis.
 field current on X-axis and power factor on Y-axis.
 either of these.

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Electrical Machines
Which of the following motor is used in grinders?

  Split phase IM.
  Synchronous motor.
  Capacitor start capacitor run IM.
  Capacitor start IM.

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