Open circuited armature coil of a D.C. machine is

Related MCQs

• Armature coil is short circuited by brushes when it lies
• 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
• 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
• Armature reaction of an unsaturated D.C. machine is
• 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
• The armature of D.C. generator is laminated to
• The resistance of armature winding depends on
• The commutator segments are connected to the armature conductors by means of
• For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ?
• In D.C. generators, current to the external circuit from armature is given through