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Electrical Machines

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

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

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Electrical Machines
Armature reaction in DC generators will result in

 increase in slip.
 open circuit.
 short circuit.
 reduction in generated emf.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

 3600 rpm.
 3000 rpm.
 500 rpm.
  600 rpm.

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

  Develop excessive speed and damage itself.
 Draw too much current.
 Produce sparking at brushes.
 Open fuse or circuit breaker.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 rotor of an synchronous machine.
 stator of a induction machine.
 rotor of a dc machine.
 stator of a dc machine.

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Electrical Machines
Total core loss is also called as -------------?

 Copper loss
 Magnetic loss
 Eddy current loss
 Hysteresis loss

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MORE MCQ ON Electrical Machines

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