DC Motors In a dc machines the residual magnetism is of the order of 10 to 15 percent 2 to 3 percent 20 to 25 percent 50 to 75 percent 10 to 15 percent 2 to 3 percent 20 to 25 percent 50 to 75 percent ANSWER DOWNLOAD EXAMIANS APP
DC Motors If the supply voltage for a D.C. motor is increased, which of the following will decrease? Full-load current Operating speed All of these Starting torque Full-load current Operating speed All of these Starting torque 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 Armature is temporarily open circuited A high value resistor is connected across the field winding A resistance is connected in series with armature A resistance is connected parallel to the armature Armature is temporarily open circuited A high value resistor is connected across the field winding A resistance is connected in series with armature ANSWER DOWNLOAD EXAMIANS APP
DC Motors ______ motors never use belt connected loads. Cummulative compounded Series Shunt Differentially compounded Cummulative compounded Series Shunt Differentially compounded ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which motor should be used for centrifugal pumps? Either series or shunt Series motor Shunt motor None of the listed here Either series or shunt Series motor Shunt motor None of the listed here ANSWER DOWNLOAD EXAMIANS APP
DC Motors A series motor will over speed when The field is opened Load is removed The load is increase The armature circuit is opened. The field is opened Load is removed The load is increase The armature circuit is opened. ANSWER DOWNLOAD EXAMIANS APP
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