I get startled, sometimes very badly, by such noises, but I wouldn't say I'm afraid of them, per se. When the fire alarm at school would go off, I'd be startled so badly I was shaking for half an hour afterward, but I was never really frightened at the possibility that it might go off or anything.
My unusual phobia is parasites, mostly internal ones. I don't get too bothered by mosquitoes or if I find a tick on me (but I am afraid of fleas because I know they can transmit tapeworms), but even the thought of things like parasitic worms makes me shudder. This phobia is partly why I'm so paranoid about food safety (though I also have a fear of non-parasitic foodborne illness), and one of the reasons I decided not to become a veterinarian (probably fairly regular contact with parasites).
_________________
Yet in my new wildness and freedom I almost welcome the bitterness of alienage. For although nepenthe has calmed me, I know always that I am an outsider; a stranger in this century and among those who are still men.
-H. P. Lovecraft, "The Outsider"