DC Generators To avoid formation of grooves in the commutator of a D.C. machine The brushes of same polarity should track each other The brushes of opposite polarity should track each other All of these Brush position has no effect on the commutator grooving The brushes of same polarity should track each other The brushes of opposite polarity should track each other All of these Brush position has no effect on the commutator grooving ANSWER DOWNLOAD EXAMIANS APP
DC Generators Carbon brushes are used in a dc machine because _______ Carbon lubricates and polishes the commutator 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 ANSWER DOWNLOAD EXAMIANS APP
DC Generators The size of a dc generator can be reduced by using ______ Magnetic material of high permeability High resistance winding material Lap winding Iron commutator Magnetic material of high permeability High resistance winding material Lap winding Iron commutator ANSWER DOWNLOAD EXAMIANS APP
DC Generators If the value of shunt field resistance of a shunt generator is greater than the critical resistance, the generator will Excite to full voltage None of the listed here Fail to excite Excite to one half of full voltage Excite to full voltage None of the listed here Fail to excite Excite to one half of full voltage ANSWER DOWNLOAD EXAMIANS APP
DC Generators High voltage dc machine use _____ winding. Either lap or wave Lap Wave None of the listed here Either lap or wave Lap Wave None of the listed here ANSWER DOWNLOAD EXAMIANS APP
DC Generators In a four-pole D.C. machine 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 Alternate poles are north and south ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS