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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

  0.905.
 1.1.
 20.
  0.05.

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Electrical Machines
The primary and secondary windings of a transformer are

  conductively linked.
  inductively linked.
 mechanically linked.
 electrically linked.

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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

  8.
 4.
 6.
  2.

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V
 T ∝ V
 T ∝ 1/V²
 T∝ V²

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Electrical Machines
What is the effect of armature reaction ?

 Armature flux distorts the main field flux.
 Armature flux weakens the main field flux.
  Both option B and C.
 None of the options.

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Electrical Machines
During hunting of a synchronous motor

  field excitation increases.
  negative phase sequence currents are generated.
  harmonic are developed in the armature circuit.
  damper bar develops torque.

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