DC Motors Excessive motor vibration is caused by Worn bearings Bent shaft Too much brush tension Open armature coil Worn bearings Bent shaft Too much brush tension Open armature coil ANSWER DOWNLOAD EXAMIANS APP
DC Motors A compensating winding is an auxiliary winding embedded in slots in Partly in pole faces, partly in armature None of the listed here The pole faces of main poles The armature Partly in pole faces, partly in armature None of the listed here The pole faces of main poles The armature ANSWER DOWNLOAD EXAMIANS APP
DC Motors The armature voltage control of dc motor provides Constant torque drive Constant current drive Constant voltage drive None of the listed here Constant torque drive Constant current drive Constant voltage drive None of the listed here ANSWER DOWNLOAD EXAMIANS APP
DC Motors If the supply voltage for a D.C. motor is increased, which of the following will decrease? Starting torque Operating speed Full-load current All of these Starting torque Operating speed Full-load current 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 Armature is temporarily open circuited A resistance is connected in series with armature A resistance is connected parallel to the armature A high value resistor is connected across the field winding Armature is temporarily open circuited A resistance is connected in series with armature A resistance is connected parallel to the armature A high value resistor is connected across the field winding ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which of the following application requires high starting torque? Locomotive Lathe machine Air blower Centrifugal pump Locomotive Lathe machine Air blower Centrifugal pump ANSWER DOWNLOAD EXAMIANS APP
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