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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 S.Ns
 Zero
 Nr
 Ns

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Electrical Machines
In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

  Rotor winding.
  Both rotor and stator winding.
  Stator winding.
  Rotor mmf wave.

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Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?

  Oil impregnated paper.
  Mica.
  Vacuum.
  Glass.

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

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

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Can not be determined.
 Armature current.
 Induced emf.
 Mechanical power.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 decreases with increase in the load torque.
 increases with increase in the load torque.
 decreases with decrease in the load torque.
 remains constant.

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