DC Motors For a D.C. shunt motor if the excitation is changed Torque will change but power will remain constant Torque, power and speed, all will change Torque will remain constant Torque and power both will change Torque will change but power will remain constant Torque, power and speed, all will change Torque will remain constant Torque and power both will change ANSWER DOWNLOAD EXAMIANS APP
DC Motors The speed of a series motor at no load is Infinity 2000 rpm 1000 rpm 4000 rpm Infinity 2000 rpm 1000 rpm 4000 rpm ANSWER DOWNLOAD EXAMIANS APP
DC Motors The variable resistor shunting the field of a dc series motor is called a Field divertor Armature divertor Potential divider Voltage regulator Field divertor Armature divertor Potential divider Voltage regulator ANSWER DOWNLOAD EXAMIANS APP
DC Motors Small dc motors up to 5 HP usually have 2 poles 6 poles 4 poles 8 poles 2 poles 6 poles 4 poles 8 poles 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 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 ANSWER DOWNLOAD EXAMIANS APP
DC Motors By putting controller resistance in series with the armature of a dc motor, we can obtain speeds Above as well as below the normal speed Below the normal speed only None of the listed here Above the normal speed only Above as well as below the normal speed Below the normal speed only None of the listed here Above the normal speed only ANSWER DOWNLOAD EXAMIANS APP
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