Which of the following methods is used to control speed of 1-ø traction? (for 25 kV, 50 Hz) All Questions › Category: Electric Vehicle › Which of the following methods is used to control speed of 1-ø traction? (for 25 kV, 50 Hz) 0 Vote Up Vote Down Rajasri Mundrathi Staff asked 3 years ago Options: a) Reduced current methodb) Tap changing control of transformerc) Series parallel operation of motorsd) All of the above 1 Answers 0 Vote Up Vote Down Rajasri Mundrathi Staff answered 3 years ago The correct answer is Tap changing control of transformer