Armature coil is short circuited by brushes when it lies

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• Open circuited armature coil of a D.C. machine is
• The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be
• If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be
• 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
• Two generators A and B have 6-poles each. Generator A has wave wound armature while generator B has lap wound armature. The ratio of the induced e.m.f. is generator A and B will be
• In lap winding, the number of brushes is always
• Copper brushes in D.C. machine are used
• 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