form factor of alternating current is 1.1 not 1.11, which
is the ratio of rms value to average value of alternating
current.so generation of ac voltage is in multiple of 11,
like 11kv,33kv,44kv,66kv etc

so every conductor has disc so the minimum range of disc is
11kv and if the voltage is high so we use another 11kv disc
so it increases number of discs

FORM FACTOR of sine wave is 1.11
rms/avg=(im/root2)/(2*im/pi) = 1.11
FF of square wave is 1.00 n triangular is 1.15
so i think form factor is not the only logic behind
11kv/33kv but while the generator o/p formula suggest there
are certain terms multiplied with the form factor(1.11) n
it is forcibly made to a standadadised value by changing
certain parameters..

how we can select a transformer based on a particular load.
suppose we have 4 motors of rating 40 h.p , 50 h.p, 80 h.p
& 100 h.p. then what rating of transformer we can select.
urgent. pls reply