DC Generators The voltage drop for which of the following types of brush can be expected to be least? None of these Graphite brushes Carbon brushes Metal graphite brushes None of these Graphite brushes Carbon brushes Metal graphite brushes ANSWER DOWNLOAD EXAMIANS APP
DC Generators Carbon brushes are used in a dc machine because _______ Carbon is cheap Carbon lubricates and polishes the commutator None of the listed here Contact resistance is decreased Carbon is cheap Carbon lubricates and polishes the commutator None of the listed here Contact resistance is decreased ANSWER DOWNLOAD EXAMIANS APP
DC Generators In a practical dc generator, mechanical efficiency is Equal to electrical efficiency More than electrical efficiency Less than electrical efficiency None of the listed here Equal to electrical efficiency More than electrical efficiency Less than electrical efficiency None of the listed here ANSWER DOWNLOAD EXAMIANS APP
DC Generators The current in armature conductors of a dc machine is ______ Pure dc Ac Pulsating dc Pure dc plus pulsating dc Pure dc Ac Pulsating dc Pure dc plus pulsating dc ANSWER DOWNLOAD EXAMIANS APP
DC Generators Which of the following could be lamina proximately the thickness of laminations of a D.C. machine? 0.005 mm 0.05 mm 5 m 0.5 m 0.005 mm 0.05 mm 5 m 0.5 m ANSWER DOWNLOAD EXAMIANS APP
DC Generators As a result of armature reaction, the reduction in the total mutual air gap flux in a D.C. generator is approximately 5 percent 10 percent 40 percent 25 percent 5 percent 10 percent 40 percent 25 percent ANSWER DOWNLOAD EXAMIANS APP
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