DC Motors Carbon brushes are preferable to copper brushes because _____ They have longer life They have lower resistance They reduce sparking They reduce armature reaction They have longer life They have lower resistance They reduce sparking They reduce armature reaction ANSWER DOWNLOAD EXAMIANS APP
DC Motors If the speed of a dc shunt motor is increased the back emf of the motor will Increase Become zero Remains same Decrease Increase Become zero Remains same Decrease ANSWER DOWNLOAD EXAMIANS APP
DC Motors For the same H.P. rating and full load speed, following motor has poor starting torque Cumulatively compounded Shunt Differentially compounded Series Cumulatively compounded Shunt Differentially compounded Series ANSWER DOWNLOAD EXAMIANS APP
DC Motors The maximum end play of a motor is about 6 mm 0.4 mm 2 mm 10 mm 6 mm 0.4 mm 2 mm 10 mm ANSWER DOWNLOAD EXAMIANS APP
DC Motors Motor starter are essential for Accelerating the motor Avoiding excessive starting current Starting the motor Preventing fuse blowing Accelerating the motor Avoiding excessive starting current Starting the motor Preventing fuse blowing 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 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 Can be used for 50°C ambient temperature also Of lower H.P. should be selected 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 Can be used for 50°C ambient temperature also Of lower H.P. should be selected ANSWER DOWNLOAD EXAMIANS APP