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Electrical Machines

Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 2
 3 or 4
 0
 1

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Electrical Machines
The frame of an induction motor is made of

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

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 more starting torque.
 more starting time.
 reduced starting current.
 smoother acceleration.

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Auxiliary winding.
 Commutating pole winding.
 Both Compensating and Commutating pole winding.
 Compensating winding.

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  high field resistance.
  high speed.
  residual flux.
  magnetic inertia.

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Electrical Machines
Which machine is used for battery charging?

 Compounded DC generator.
 None of these.
 DC shunt generator.
 DC series generator.

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MORE MCQ ON Electrical Machines

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