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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

  DOL.
  both A and B.
None of these
  star delta.

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Electrical Machines
Synchronising power of a synchronous motor varies

 directly as Xs2
 directly as synchronous reactances Xs
 inversely as 1/Xs
All of these

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

  high speed motor.
  single phase induction motor.
  high torque motor.
  low horse power motor.

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Electrical Machines
Which of the following statement is correct, if short circuit ratio is high?

None of these
 High voltage regulation
 Good voltage regulation
 Low short circuit current

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Electrical Machines
The frame of an induction motor is made of

  silicon steel.
  aluminium.
  closed grained cast iron.
  stainless steel.

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Electrical Machines
Width of a carbon brush should be equal to

 the width of the 2 to 3 commutator segment.
 less than the width of commutator segment.
 the width of the 1 to 2 commutator segment.
 the width more than 3 commutator segment.

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