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Electrical Machines

Electrical Machines
Diverters are used only in

None of these
 either of these
 series motors
 shunt motors

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 f2
 V2
 V
 f

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Electrical Machines
A 3 - Φ slip ring motor has

  short-circuited rotor.
  double cage rotor.
  any of the above.
  wound rotor.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 40W
 60W
 100W
 80W

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Rf maximum and Ra minimum
 Ra maximum and Rf minimum
 Ra minimum and Rf minimum
 Ra maximum and Rf maximum

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Electrical Machines
The stator core of a 3 - Φ induction motor is laminated in order to reduce the

  both of the above.
  weight of the stator.
  hysteresis loss.
  eddy current loss.

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MORE MCQ ON Electrical Machines

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