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Electrical Machines

Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 V²
 supply voltage V
 1/V²
 1/V

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Electrical Machines
Which of the following motor has the highest power factor at full load?

 Capacitor run
 Shaded pole
 Resistance split phase
 Capacitor start

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

 50 W
 75 W
 168.75 W
 112.5 W

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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.
None of these
  stator phases of the motor.
  starting resistance in the starter.

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

 shaft rotation is high.
 induced voltage is high.
 rate of change of flux is minimum.
  rate of change of flux is maximum.

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 none of these
 machine A
 machine B
 any of the two machines

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