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Electrical Machines

Electrical Machines
The armature reaction mmf in a DC machines has a form of

 sinusoidal.
 trapezoidal.
 rectangular.
  triangular.

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Electrical Machines
Drop in speed from no load to full load is very high in

 Cummulative compound motor with interpoles.
  Series motor without interpoles.
 Series motor with interpoles.
 Shunt motor with interpoles.

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Electrical Machines
Methods of synchronizing of alternator may be done by

  all of these.
 all dark lamp method.
 all bright lamp method.
 one dark two bright.

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/4Sa²
 PZL/4Sp²
 PZL/ 4Sa
 PZL/4S

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Electrical Machines
The flux is maximum in the following part of a DC motor:

 under leading pole tip.
 pole core.
 under the interpole.
 under trailing pole tip.

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Electrical Machines
Dynamic braking can be used for

 compound motors.
 series motors.
All of these
 shunt motors.

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