DC Motors By flux control method of speed control of a dc shunt motor, we can obtain speeds. Below the normal speed only Above the normal speed only None of the listed here Above as well as below the normal speed Below the normal speed only Above the normal speed only None of the listed here Above as well as below the normal speed ANSWER DOWNLOAD EXAMIANS APP
DC Motors Small dc motors up to 5 HP usually have 6 poles 2 poles 4 poles 8 poles 6 poles 2 poles 4 poles 8 poles ANSWER DOWNLOAD EXAMIANS APP
DC Motors Three point starter can be used for Both shunt and compound motor Compound motor only Series motor only Shunt motor only Both shunt and compound motor Compound motor only Series motor only Shunt motor only ANSWER DOWNLOAD EXAMIANS APP
DC Motors The main disadvantage of the Ward-Leonard control method is Low efficiency at high loads High maintenance cost High initial cost All of these Low efficiency at high loads High maintenance cost High initial cost All of these ANSWER DOWNLOAD EXAMIANS APP
DC Motors As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit A resistance is connected parallel to the armature A resistance is connected in series with armature A high value resistor is connected across the field winding Armature is temporarily open circuited A resistance is connected parallel to the armature A resistance is connected in series with armature A high value resistor is connected across the field winding Armature is temporarily open circuited ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which motor has the poorest speed control? Differentially compounded motor Series motor Shunt motor Cummulative compounded motor Differentially compounded motor Series motor Shunt motor Cummulative compounded motor ANSWER DOWNLOAD EXAMIANS APP
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