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Electrical Machines

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

 Armature.
  Commutator.
 Yoke.
 Brush.

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 0
 2
 3 or 4
 1

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  about 2 V.
  about 50 V.
  220 V.
  zero.

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 high filed circuit resistance.
 over load.
 zero or very low voltage supply.
 all of these.

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Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 90o.
 0o.
 180o.
 dependent upon the load.

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Electrical Machines
The armature shaft must be able to with stand

All of these
 Twisting stains due to transmission of torque.
 Bending moment due to weight of the armature.
 Any unbalanced magnetic pull on the armature core.

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MORE MCQ ON Electrical Machines

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