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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

 DC shunt.
 DC compound.
 Induction motor.
  DC series.

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

 open slot----- leakage flux is less
 closed slot----- leakage flux is high
 semi closed slot-----leakage flux is moderate
All of these

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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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Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

 none.
 N1 : N2.
 N12 : N22.
 1 : 1.

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Electrical Machines
In DC generators, electric current to the external circuit from armature is given through

 solid connection.
 none of above.
 slip rings.
 commutator.

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

  Armature current and field current.
 Torque and field current.
 Armature current and torque.
 Power factor and field current.

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