DC Motors Carbon brushes are preferable to copper brushes because _____ They reduce armature reaction They have lower resistance They reduce sparking They have longer life They reduce armature reaction They have lower resistance They reduce sparking They have longer life ANSWER DOWNLOAD EXAMIANS APP
DC Motors D.C. generators are normally designed for maximum efficiency around Rated r.p.m. Full load All of these Rated voltage Rated r.p.m. Full load All of these Rated voltage ANSWER DOWNLOAD EXAMIANS APP
DC Motors Three point starter can be used for Both shunt and compound motor Series motor only Compound motor only Shunt motor only Both shunt and compound motor Series motor only Compound motor only Shunt motor only ANSWER DOWNLOAD EXAMIANS APP
DC Motors If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor Can be used for 50°C ambient temperature also Of higher H.P. should be selected Is to be de-rated by a factor recommended by manufacturer and select the next higher H.P. motor Of lower H.P. should be selected Can be used for 50°C ambient temperature also Of higher H.P. should be selected Is to be de-rated by a factor recommended by manufacturer and select the next higher H.P. motor Of lower H.P. should be selected ANSWER DOWNLOAD EXAMIANS APP
DC Motors ______ motor has the best speed regulation. Shunt Series Differentially compounded Cummulative compounded Shunt Series Differentially compounded Cummulative compounded ANSWER DOWNLOAD EXAMIANS APP
DC Motors The greatest percentage of power loss in a dc motor is due to Windage loss Friction loss Copper loss Core loss Windage loss Friction loss Copper loss Core loss ANSWER DOWNLOAD EXAMIANS APP
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