A.C. series motor as compared to D.C. series motor hasÂ smaller brush width,Â less number of field turns,Â more number of armature turns,Â less air gap.

Last Answer : If a D.C. series motor is operated on A.C. supply, it willÂ spark excessively,Â have poor efficiency,Â have poor power factor.

Description : State the modification to be done in dc series motor to work satisfactorily as ac series motor. State applications of ac series motor.

Last Answer : Modifications are necessary in a dc series motor so that it operates satisfactorilyÂ on ac supply. The modifications are as follows:Â 1) AC series motor is built with a few field turns as ... and grinders 5) High speed vacuum cleaners 6) Sewing machines 7) Food processors 8) Drilling machineÂ

Last Answer : In a A.C. series motor armature coils are usually connected to commutatorÂ through resistance.

Description : Describe the reason of using dc series motor for electric trains.

Last Answer : Electric trains require an inverse torque speed characteristics for proper operation. That is a higher torque is required at start (when speed is nil or low) and as the trainÂ picks up ... torque - speedÂ characteristics of DC series motors match, these motors are suitable for electric trains

Description : In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at half full load in N -m is :

Last Answer : In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at half full load in N -m is :Â 0.075