An IDG (Integrated Drive Generator) includes a:

Constant-speed drive (CSD) and generator in one unit

Correct

Battery and inverter

DC motor and AC generator

Transformer and rectifier

Explanation

The IDG combines a constant-speed drive (hydromechanical) with an AC generator to produce constant-frequency 400 Hz power despite varying engine RPM.

Test yourself with random questions from Aircraft General Knowledge and all other ATPL subjects.