CC Commercal Element 3 Queston Pool

C. The magnetic devices in a 400 Hz power supply such as transformers, chokes and filters are smaller and lighter than those used in 60 Hz power supplies. D. 400 Hz power supplies are much less expensive to produce than power supplies with lower line frequencies. 3-73K2 Aviation services use predominantly ____ microphones. A. Dynamic. B. Carbon ................
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