DC Generators Carbon brushes are used in a dc machine because _______ Carbon lubricates and polishes the commutator Contact resistance is decreased None of the listed here Carbon is cheap Carbon lubricates and polishes the commutator Contact resistance is decreased None of the listed here Carbon is cheap ANSWER DOWNLOAD EXAMIANS APP
DC Generators When two D.C. generators are running in parallel an equalizer bar is used To increase the series flux So that the two identical machines will pass approximately equal currents to the load To reduce the combined effect of armature reaction of both the machines To increase the generated e.m.f. To increase the series flux So that the two identical machines will pass approximately equal currents to the load To reduce the combined effect of armature reaction of both the machines To increase the generated e.m.f. ANSWER DOWNLOAD EXAMIANS APP
DC Generators In a wave winding, the commutator pitch is approximately equal to Thrice the pole pitch None of the listed here Twice the pole pitch Pole pitch Thrice the pole pitch None of the listed here Twice the pole pitch Pole pitch ANSWER DOWNLOAD EXAMIANS APP
DC Generators Which of the following will not prevent a self excited shunt generator from building upto its full voltage? No residual magnetism Wrong direction of rotation Open field Speed too high No residual magnetism Wrong direction of rotation Open field Speed too high ANSWER DOWNLOAD EXAMIANS APP
DC Generators A 6 pole lap wound generator has 300 conductors, the emf induced per conductor being 5 V. The generated voltage of the generator is _____ 1500 V 360 V 60 V 250 V 1500 V 360 V 60 V 250 V ANSWER DOWNLOAD EXAMIANS APP
DC Generators An exciter for a turbo generator is a Shunt generator Compound generator Series generator Separately excited generator Shunt generator Compound generator Series generator Separately excited generator ANSWER DOWNLOAD EXAMIANS APP
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