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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 DC generator
 DC motor
 AC generator
 induction motor

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

  s.
 2 + s.
 1 - s.
  2 - s.

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

  222 V.
 230 V.
 225 V.
 220 V.

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Electrical Machines
The flux involved in the emf equation of a transformer has

 total value.
  maximum value.
 average value.
 rms value.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 decreases with decrease in the load torque.
 decreases with increase in the load torque.
 remains constant.
 increases with increase in the load torque.

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 DC.
 AC.
 both of above.
None of these

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