Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 2 alone
 1, 2 and 3
 1 and 3
 1 and 2

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Electrical Machines
In a DC machine the armature mmf is

  stationary with respect to field poles.
  rotating with respect to field poles as well as armature.
  stationary with respect to armature.
 rotating with respect to field poles.

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