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

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

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Electrical Machines
In a DC machine

 emf in armature conductors and at the terminals is alternating.
 current and emf in armature are alternating.
 current and emf in armature are unidirectional
 current and emf at the terminals are alternating.

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