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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 GNA
None of these
 MNA
 either GNA or MNA

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 remains same.
 none of these.
 Decrease.d
 increase.

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Electrical Machines
DC series motor is best suited for electric traction as

 It is cheaper in cost.
 It consume less power.
 It runs at very high speed at light load.
  It develops high starting torque.

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Electrical Machines
The DC compound motors are generally

 Cummulative compound.
 Differentical compound.
 Level Compound.
 None of these.

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Armature.
  Commutator.
 Brush.
 Yoke.

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  resonance.
  crawling.
  harmonics.
  cogging.

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