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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?

 1.1.
  0.905.
  0.05.
 20.

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 1 Hz
 2.5Hz
 2HZ
 50Hz

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Electrical Machines
Which of the following statements are correct ?

None of these
 The leakage reactance of the induction motor should be small.
 A small value of leakage reactance will increase the maximum power output of motor.
 Both 1 and 2.

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

  Can't be determined.
 20 N.
  None of these.
  15 N.

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Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?

  Oil impregnated paper.
  Mica.
  Vacuum.
  Glass.

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Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 1/3
 √3
 1/√3
 3

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