Electrical Machines
To avoid formation of grooves in the commutator

  the brushes of opposite polarity should track each other.
  brush position has no effect on the commutator grooving.
None of these
 the brushes of same polarity should track each other.

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. How will the machine share, if the load is 600 MW?

 generator 1 gets over load
 generator 2 gets over load
 200 MW and 400MW respectively
 230.7 MW and 369.23 MW respectively

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