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Electrical Machines

Electrical Machines
Motors for fans and pumps are selected in the rpm range

  500 to 720.
  720 to 920.
  1440 to 2880.
  375 to 500.

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 Synchronous motor.
 DC Shunt Motor
 Induction motor.
 AC single phase motor.

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

  the use equalizer in lap winding.
 reactance voltage produced due to communication.
 the use drum winding.
 the use of compensating winding.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 synchronous speed.
 any of the above.
 slip speed.
 normal speed.

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Electrical Machines
The three point starter is used for

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

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Electrical Machines
A compound motor has

  only series field winding.
  tertiary winding.
  both shunt and series field winding.
  only shunt field winding.

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MORE MCQ ON Electrical Machines

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