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Electrical Machines

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

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

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 750 rpm
 3000 rpm
 1000 rpm
 1500 rpm

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

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

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 depend on other factors.
 remain unchanged.
 reduce by 5 %.
 increase by 5 %.

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Electrical Machines
Flux density under leading pole tips in case of generator will

None of these
 either increase or decrease
 decrease
 increase

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 KVA ratings are equal
 percentage impedances are equal
 polarities are properly connected
 turn- ratios are exactly equal

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MORE MCQ ON Electrical Machines

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