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ELECTRICAL MACHINES

Electrical Machines
Drop in speed from no load to full load is very high in

 Shunt motor with interpoles.
 Cummulative compound motor with interpoles.
 Series motor with interpoles.
  Series motor without interpoles.

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Electrical Machines
For standing a DC motor a starter is required because

None of these
  it limits the starting current to a safe value.
  it limits the speed of the motor.
  It starts the motor.

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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

  Any of above method.
  Rheostatic control.
  Ward Leonard control.
  None of above.

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Electrical Machines
The three point starter is used for

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

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Electrical Machines
Ward Leonard control is provides speed control

  In both direction.
  Below rated speed.
  In one direction only.
  Above rated speed.

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