Which of the following statements is true concerning the application for an isochronous governor?

Correct Answer: Option D — An isochronous governor is ideally suited for a ship's service alternator drive associated with maintaining a constant system frequency.

Isochronous governors maintain a constant speed regardless of load variations. This is essential for ship service alternators, which must maintain a precise, constant frequency (typically 60 Hz) to ensure the stability of electrical equipment and sensitive electronics throughout the vessel, regardless of changes in the electrical load.