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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 0 < S < 1
 -1 < S < 1
 -2 < S < 2
 0 < S < 2

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors. Calculate the back emf produced when it is running at a speed of 1500 rpm.

 230 volt.
  220 volt.
 240 volt.
 440 volt.

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

 PZL/4SP²
 PZL/4Sa²
 PZL/4S
 PZL/ 4Sa

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Electrical Machines
Methods of synchronizing of alternator may be done by

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

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  reduce the eddy currents.
  reduce noise level only.
  prevent hunting and provide the starting torque.
  provide starting torque only.

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

  120 volt.
  None of these.
 220.4 volt.
  218.5 volt.

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