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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

  15 %.
  2.5 %.
 10 %.
  20 %.

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Electrical Machines
When a synchronous motor is running at synchronous speed, the damper winding produces

 both 1 and 2.
 eddy current torque.
 no torque.
 damping torqe.

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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.

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

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/3, 1/3
 1/√3, 1/√3
 1/√3, 1/3
 1/3, 1/√3

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Electrical Machines
Tappings of a transformer are provided

 at the middle of hv side
 at the phase end of lv side
 at the phase end of hv side
 at the neutral side end of hv side

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Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/2.
 PN/120.
 PN/3000.
 PN/60.

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