DC Motors The rheostatic speed control method is very Efficient Economical Suitable for getting speeds above the normal Unsuitable for rapidly changing loads Efficient Economical Suitable for getting speeds above the normal Unsuitable for rapidly changing loads ANSWER DOWNLOAD EXAMIANS APP
DC Motors If conditions for maximum power for a dc motor are established, the efficiency of the motor will be 100 % Less than 50% 80 to 90 % 60 to 70 % 100 % Less than 50% 80 to 90 % 60 to 70 % 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 Which of the following motor has the poorest speed regulation? Shunt motor Differentially compound motor Cummulative compound motor Series motor Shunt motor Differentially compound motor Cummulative compound motor Series motor ANSWER DOWNLOAD EXAMIANS APP
DC Motors A dc motor can be easily identified by Commutator Size of conductor Yoke Winding Commutator Size of conductor Yoke Winding ANSWER DOWNLOAD EXAMIANS APP
DC Motors If a D.C. motor is to be selected for conveyors, which rriotor would be preferred ? Series motor Differentially compound motor Cumulative compound motor Shunt motor Series motor Differentially compound motor Cumulative compound motor Shunt motor ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS