Electrical Machines
which of the following type of brush and their application is/are correct

 carbon brush → normal ratings
All of these
 electro graphite → large ratings
 copper graphite → low voltage high current density

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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 4% and 5% 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
None of these
 200 MW and 400MW

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Electrical Machines
A 3-φ alternator has negligible stator resistance. A short circuit test is conducted on this alternator. At a particular speed, a field current of If1 is required to drive the rated armature current. If the speed of the alternator is reduced to half, the field current required to maintain rated armature current

 Would be equal to If1.
  Cannot be predicted due to insufficient data.
 Would be equal to If1/2.
 Woud be equal to 2If1.

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