Answer Posted / girish

B'coz Form Factor of AC Sine Wave is 1.1 so Transmission
Voltages will always be the integral multiples of 11

for eg. 220, 440, 660, 1100, 3300, 6600, 11000, 33000,
66000, 110000

Form Factor = RMS Value of Sine Wave / Average Value of Sine
Wave

RMS Value = 0.707
Average Value = 0.683

0.707 / 0.683 = 1.1

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