Electrical Machines
The three point starter is used for

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

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Electrical Machines
If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)

 remain the same as the original
 changes to 0.5 times the original value
 changes to three times the original value
 changes to 1.5 times the original value

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Electrical Machines
In a synchronous motor when the rotor speed exceeds the synchronous speed during hunting

  the damper bars develop synchronous motor torque.
  the damper bars develop induction generator torque.
  negative sequence currents are generated.
  the damper bars develop induction motor torque.

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