| Some aircraft and avionics equipment operates with a prime power line frequency of 400 Hz. What is the principle advantage of a higher line frequency? |
| A) 400 Hz power supplies draw less current than 60 Hz supplies allowing more current available for other systems on the aircraft. |
| B) A 400 Hz power supply generates less heat and operates much more efficiently than a 60 Hz power supply. |
| 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. |
