DC Generators Carbon brushes are used in a dc machine because _______ Contact resistance is decreased Carbon is cheap None of the listed here Carbon lubricates and polishes the commutator Contact resistance is decreased Carbon is cheap None of the listed here Carbon lubricates and polishes the commutator ANSWER DOWNLOAD EXAMIANS APP
DC Generators In a four-pole D.C. machine Alternate poles are north and south All the four poles are south poles All the four poles are north poles Two north poles follow two south poles Alternate poles are north and south All the four poles are south poles All the four poles are north poles Two north poles follow two south poles 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 10 percent 5 percent 25 percent 40 percent 10 percent 5 percent 25 percent 40 percent ANSWER DOWNLOAD EXAMIANS APP
DC Generators D.C. generator generally preferred for charging automobile batteries is Any of the above Shunt generator Long shunt compound generator Series generator Any of the above Shunt generator Long shunt compound generator Series generator ANSWER DOWNLOAD EXAMIANS APP
DC Generators In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralized by all of the following except Compensating winding Interpoles Dummy coils Shifting of axis of brushes Compensating winding Interpoles Dummy coils Shifting of axis of brushes ANSWER DOWNLOAD EXAMIANS APP
DC Generators _____ together are called stray losses. Field copper loss and iron loss Copper and iron losses Frictional loss and copper loss Iron and friction losses Field copper loss and iron loss Copper and iron losses Frictional loss and copper loss Iron and friction losses ANSWER DOWNLOAD EXAMIANS APP
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