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Electrical Machines

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

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

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Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 less than 50%.
 between 50% and 90%.
 more.
 same.

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 synchronizing power co efficient.
  restoring torque.
 mechanical rotatory system.
 damping torque.

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  reduces inter poles flux density.
  increases armature speed.
  reduces generator emf.
  results in sparking trouble.

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Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is

 cross – magnetizing.
 ineffective.
  demagnetizing.
 magnetizing.

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 2 / 3.
 5 / 6.
 6 / 7.
  4 / 5.

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