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Electrical Machines

Electrical Machines
Which of the following motors has low ratings only?

 Capacitor run
 Shaded pole
 Resistance split phase
 Capacitor start

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 smoother acceleration.
 more starting time.
 more starting torque.
 reduced starting current.

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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
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 32.
 16.
 8.
  4.

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 1/4 of the intial value
 1/2 of the initial value
 twice the initial value
 4 time the initial value

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Electrical Machines
If input of a transformer is square wave the output will be

 sine wave.
 triangular wave.
 square wave.
  pulsed wave.

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