To achieve sparkless commutation brushes of a D.C. generator are rockedm ahead soas to bring them

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 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 losses occurring in a D.C. generator are given below. Which loss is likely to have highest proportion at rated load of the generator ?
• A separately excited generator as compared to a self-excited generator
• Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator ?
• 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 generatorA and B will be
• The e.m.f. generated by a shunt wound D.C. generator isE. Now while pole flux remains constant, if the speed of the generator is doubled, the e.m.f. generated will be
• Satisfactory commutation of D.C. machines requires
• In lap winding, the number of brushes is always
• Copper brushes in D.C. machine are used