DC Motors Carbon brushes are preferable to copper brushes because _____ They reduce sparking They have lower resistance They reduce armature reaction They have longer life They reduce sparking They have lower resistance They reduce armature reaction They have longer life ANSWER DOWNLOAD EXAMIANS APP
DC Motors In dc machines fractional pitch winding is used To reduce the generated emf To reduce the sparking To improve cooling To increase the generated emf To reduce the generated emf To reduce the sparking To improve cooling To increase the generated emf ANSWER DOWNLOAD EXAMIANS APP
DC Motors A dc series motor is that which Has a poor torque Can be started easily without load Has almost constant speed Has its field winding consisting of thick wire and less turns Has a poor torque Can be started easily without load Has almost constant speed Has its field winding consisting of thick wire and less turns ANSWER DOWNLOAD EXAMIANS APP
DC Motors If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor Can be used for 50°C ambient temperature also Is to be de-rated by a factor recommended by manufacturer and select the next higher H.P. motor Of higher H.P. should be selected Of lower H.P. should be selected Can be used for 50°C ambient temperature also Is to be de-rated by a factor recommended by manufacturer and select the next higher H.P. motor Of higher H.P. should be selected Of lower H.P. should be selected ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a D.C. generator, the iron losses mainly take place in Yoke Armature conductors Commutator Armature rotor Yoke Armature conductors Commutator Armature rotor ANSWER DOWNLOAD EXAMIANS APP
DC Motors ______ motor has the best speed regulation. Cummulative compounded Shunt Differentially compounded Series Cummulative compounded Shunt Differentially compounded Series ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS