Which of the following methods is used to control speed of 25 kV, 50 H – McqOptions

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1.	Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction?%!
A.	Reduced current method
B.	Tap changing control of transformer
C.	Series parallel operation of motors
D.	All of the above
Answer» C. Series parallel operation of motors

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