This is used to control the frequency on large commercial jets.

This is used to control the frequency on large commercial jets.

• A. CSD( constant speed drive )or IDG (integrated drive generator)
• B. DC-DC converter
• C. Battery management system
• D. Variable frequency drive

Answer: (A)

The frequency of aircraft AC power is kept constant by tying the generator speed to a fixed value despite changes in engine speed. Large jets use a constant speed drive or an integrated drive generator to accomplish this. The constant speed drive is a hydraulic/mechanical system that forces the generator to spin at the correct speed, so the output frequency stays at the nominal level (typically 400 Hz). An integrated drive generator combines the drive and generator in one unit and automatically maintains that constant speed and stable electrical output. That’s why this approach is used to control frequency on large commercial jets. DC-DC converters deal with DC voltages, not AC frequency. Battery management systems oversee battery health and charging. A variable frequency drive would intentionally change the frequency, which isn’t how aircraft power systems are normally kept stable; the standard is to maintain a constant frequency using a CSD or IDG.

The frequency of aircraft AC power is kept constant by tying the generator speed to a fixed value despite changes in engine speed. Large jets use a constant speed drive or an integrated drive generator to accomplish this. The constant speed drive is a hydraulic/mechanical system that forces the generator to spin at the correct speed, so the output frequency stays at the nominal level (typically 400 Hz). An integrated drive generator combines the drive and generator in one unit and automatically maintains that constant speed and stable electrical output. That’s why this approach is used to control frequency on large commercial jets.

DC-DC converters deal with DC voltages, not AC frequency. Battery management systems oversee battery health and charging. A variable frequency drive would intentionally change the frequency, which isn’t how aircraft power systems are normally kept stable; the standard is to maintain a constant frequency using a CSD or IDG.