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

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

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Electrical Machines
In the 3-phase induction motor, the resultant flux is of a constant nature and is

 3 times maximum value of flux due to any phase
 equal to φm, where φm is the maximum flux due to any phase
 3/2 times maximum value of flux due to any phase
 1/2 times maximum value of flux due to any phase

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Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

 wave-wound machine will have more rated current and more voltage
 lap-wound machine will have more rated voltage and more current
 lap-wound machine will have more rated voltage and less current
 wave-wound machine will have more rated voltage and less current

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