DC Motors In a dc machines the residual magnetism is of the order of 10 to 15 percent 50 to 75 percent 2 to 3 percent 20 to 25 percent 10 to 15 percent 50 to 75 percent 2 to 3 percent 20 to 25 percent ANSWER DOWNLOAD EXAMIANS APP
DC Motors Excessive sparking at brushes may be caused due to Misaligment of machine Loose coupling Worn bearings Dirt on the commutator Misaligment of machine Loose coupling Worn bearings Dirt on the commutator ANSWER DOWNLOAD EXAMIANS APP
DC Motors The most suitable motor for elevators is the ____ motor. Series Shunt Differentially compuonded Cummulative compounded Series Shunt Differentially compuonded Cummulative compounded ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which one of the following is not the function of pole shoes in a D.C. machine? To spread out flux for better uniformity To support the field coils To reduce the reluctance of the magnetic path To reduce eddy current loss To spread out flux for better uniformity To support the field coils To reduce the reluctance of the magnetic path To reduce eddy current loss ANSWER DOWNLOAD EXAMIANS APP
DC Motors D.C. series motors are used Where constant operating speed is needed Where load is constant None of these Where load changes frequently Where constant operating speed is needed Where load is constant None of these Where load changes frequently ANSWER DOWNLOAD EXAMIANS APP
DC Motors The speed of a _____ motor is practically constant. Series Differentially compounded Cumulatively compounded Shunt Series Differentially compounded Cumulatively compounded Shunt ANSWER DOWNLOAD EXAMIANS APP
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