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546 - ATPL - The function of a constant speed drive (CSD) in an AC generating system is to:

Question 546 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Directly maintain a constant proportion between the RPM of an engine and a generator.
Vary generator RPM in order to compensate for various AC loads.
Vary the engine RPM (within limits) to compensate for various AC loads.
Drive the generator at a constant speed.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license