Electrical Machines
In DC generator, armature reaction refers to what?

 Effect of armature flux on the load.
 Effect of field flux on the armature flux.
None of these
  Effect of armature flux on the main field flux.

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Electrical Machines
Which of the following factors improve commutation in a dc machine ? 1. High contact resistance of brushes 2. High inductance of the coils undergoing commutation 3. Shifting of brushes in the direction of rotation for a generator and in the opposite direction For a motor 4. Narrow width for the commutation bars Select the correct answer using the codes given below : Codes :

 1 and 3
 1, 2, and 3
 2, 3 and 4
 1, 2 and 4

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