10. In case of electric traction, power supply frequency for 25 kV single phase system is
A. 50 Hz
B. 16? Hz
C. 25 Hz
D. 50 Hz
10. In case of electric traction, power supply frequency for 25 kV single phase system is
A. 50 Hz
B. 16? Hz
C. 25 Hz
D. 50 Hz