Frequency Question

In general frequency is just a different parameter to electricity that's independent of voltage or current. One can design a voltage or current to frequency converter that is intended to be sensitive to either. One can also design a frequency producing circuit insensitive to voltage and current.

Frequency depends on how fast the generator is turning.

Do your own homework.

neither of course you might want to brush up on alternating current theory, this is a 101 high school electricity question

Your Frequency is depend upon speed of alternator which is generating power.

This sounds a little like which came first, "the chicken or the egg"?

In the most fundamental way of understanding voltage and current, I like to associate current with a rise in potential voltage, no matter how it is produced. In that way, frequency is responsible for the changes in voltage and current follows as a result.

VCXO?

That would be voltage...

Now as far as AC power generation...see above ↑