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Electrical Machines

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.
 6 / 7.
 5 / 6.
  4 / 5.

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

None of these
 On yoke in the inter pole gap.
 On armature.
  On yoke in the pole faces.

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 1, 2, 5
 1, 3, 5
 1, 2, 3, 4
 2, 3, 4

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Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  Shunt.
  None of them.
  Compound.
  Series.

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Electrical Machines
In a seperately excited DC Motor if field current is increased, it will

 Reduce starting torque.
 Reduce armature heating.
 Increase speed
 Increase acceleration duration.

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmin to Imax
 Vmax to Imin
 Vmax to Imax
 Vmin to Imin

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