Which method is best for series traction motors?(a) Rheostatic armature control(b) Shunted armature control(c) Series parallel control method(d) Any method can be employedThe question was asked by my school principal while I was bunking the class.This interesting question is from Speed Control Using Armature Control in DC Motor in section DC Motors of DC Machines

Which method is best for series traction motors?(a) Rheostatic armatur

1.	Which method is best for series traction motors?(a) Rheostatic armature control(b) Shunted armature control(c) Series parallel control method(d) Any method can be employedThe question was asked by my school principal while I was bunking the class.This interesting question is from Speed Control Using Armature Control in DC Motor in section DC Motors of DC Machines
Answer» Right option is (c) Series parallel control method For explanation: Series-parallel control method is SUPERIOR to the rheostatic control INSOFAR as efficiency is concerned. However, it is limited to two SPEED steps. The method is commonly employed for speed control of series traction MOTORS.

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