DC Motors Which of the following law can be used to determine the direction of rotation of dc motor? Faraday's law Lenz's law Fleming's left hand rule Coloumb's law Faraday's law Lenz's law Fleming's left hand rule Coloumb's law ANSWER DOWNLOAD EXAMIANS APP
DC Motors The speed of a _____ motor is practically constant. Shunt Series Cumulatively compounded Differentially compounded Shunt Series Cumulatively compounded Differentially compounded ANSWER DOWNLOAD EXAMIANS APP
DC Motors If the supply voltage for a D.C. motor is increased, which of the following will decrease? Operating speed Starting torque All of these Full-load current Operating speed Starting torque All of these Full-load current ANSWER DOWNLOAD EXAMIANS APP
DC Motors In D.C. machines the residual magnetism is of the order of 50 to 75 percent 10 to 15 percent 20 to 25 percent 2 to 3 percent 50 to 75 percent 10 to 15 percent 20 to 25 percent 2 to 3 percent ANSWER DOWNLOAD EXAMIANS APP
DC Motors D.C. generators are normally designed for maximum efficiency around Rated voltage All of these Rated r.p.m. Full load Rated voltage All of these Rated r.p.m. Full load 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 high value resistor is connected across the field winding A resistance is connected in series with armature Armature is temporarily open circuited A resistance is connected parallel to the armature A high value resistor is connected across the field winding A resistance is connected in series with armature Armature is temporarily open circuited A resistance is connected parallel to the armature ANSWER DOWNLOAD EXAMIANS APP
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