Copper brushes in D.C. machine are used

Related MCQs

• If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be
• In lap winding, the number of brushes is always
• Brushes of D.C. machines are made of
• The material for commutator brushes is generally
• In D.C. generators, the brushes on commutator remain in contact with conductors which
• The number of brushes in a commutator depends on
• In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except
• To achieve sparkless commutation brushes of a D.C. generator are rockedm ahead so as to bring them
• Armature coil is short circuited by brushes when it lies
• The rapid wear of brushes takes place due to