Answer / bala123

Because the Form factor of AC system is 1.11,thats why the
voltage rating from the transformer was above format

Answer / syam kumar

beacuse Tranformer output voltage is given by the equation

E = 4.44f(phi)N

so Voltages are multiples of 1.11

Answer / vipul mali

because form factor is definded by

ff= r.m.s. value/average value

ff= 1/root 2/ 2f/ pi

ff= 1.11

so all the equipments are disigned with this value.

Answer / eng_entropy

Because these values of voltage are the standard values
which produced by the generators.

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