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Electrical Machines

Electrical Machines
Which of the following relation is correct?

 Xd > Xq.
 Xd = Xq.
 Xd < Xq.
None of these

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

 74 Nm.
 38.5 Nm.
  65.8 Nm.
 27.73 Nm .

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Electrical Machines
Which of the following statements is/are correct ?

 Inter pole winding will act in interpolar region.
 Both A and B.
None of these
 Compensating winding will act under the pole.

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

 high resistance of carbon brushes.
  reactance voltage.
 presence of commutator.
 armature reaction.

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

 60 V.
 0 V.
 20 V.
  40 V.

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 cos2δ
 sinδ
 sin2δ
 cosδ

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