Why electrical voltage is produced in multiples of 11?

I have normally seen electrical voltage in the multiple of 11 like 110, 220, 440, 11000, 33000 and so on. Is there any technical reason behind this funda or it is just happended without any specific reason?

Is it the answer of my question, if it is then not clear to me. Pl explain.

I never really thought about common voltages being multiples of 11. I can't think of any technial reason for voltages to be multiples of any number. Every electrical design decision is based on advantages and disadvantages. Were we to power our appliances with 35v than we wouldn't need to worry about people electrocuting themselves from home wiring but we would need power cords as thick as a garden hose for our appliances. If we were to power our appliances with 1KV than our power cords could be thin, losses would be lower, but our home wiring would be far more dangerous to work with.

While 110VAC is the nominal voltage (though sometimes it is refered to as 120) in the US common outlet voltage can range from 110VAC to 120VAC RMS. Looking at digital readouts on our PDUs I see one supplying exactly 120V and another 117V.

Generally power coming into homes and small businesses is 220-240 VAC RMS. This voltage goes to certain high power appliances like dryers, oven/ranges, and electric heaters. For everything else each leg of the 220-240V is split off and supplies 110-120V. The 110-120 and 220-240 exist because the former is half of the later.