Under normal conditions, yes. However, this thread seems to lean towards very small defects in said electronic ballasts which make this whistling sound without otherwise affecting performance. Of course, they're not supposed to emit audible sounds but that would be in a perfect world.
Interestingly, I have started to take notice of this in a more active way and I found something. I have several MH electronic ballasts in use, two of which are full case and three that are small case (intended for small track lights). The bigger ones whistle (although not always) and the smaller ones don't. I wonder if the larger case amplifies the sound, or if it is just a coincidence.
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