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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.7.
  1.
 0.3.
  0.54.

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Electrical Machines
A DC series motor must started on no load because it would

 Draw more current without producing sufficient torque.
  Run at dangerously high speed.
 Fail to start without load.
 Not develop starting torque.

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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

  2.
  data provided is insufficient.
  4.
 6.

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Electrical Machines
Transformers operating in parallel will share the load depending upon their

 efficiency.
 percentage impedance.
 rating.
 leakage reactance.

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

  2.5 %.
  15 %.
  20 %.
 10 %.

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Electrical Machines
Armature reaction effect is more in which of the following methods?

 same in both methods
 field weakening method
None of these
 armature resistance control

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