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Electrical Machines

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

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

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Electrical Machines
What is the necessity of copper brushes in a dc motors?

  To increase the flux cutting by the rotor.
  None of these.
  To convert alternating supply current to direct current.
  To absorb the mechanical shocks produced during running condition.

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 less and maximum torque increases
 more and maximum torque remains constant
 more and maximum torque decreases
 less and maximum torque decreases

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Electrical Machines
Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to

  coil resistance.
  reactance voltage induced in the coil.
 armature emf.
None of these

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Electrical Machines
For pure resistive load what is the armature reaction?

 cross magnetization
All of these
 demagnetization
 magnetization

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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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