Question 151General Subjects - Assistant Engineer

The correct answer is D. An isochronous governor is ideally suited for a ship's service alternator drive associated with maintaining a constant system frequency. This is because an isochronous governor is designed to maintain a constant rotational speed, which is necessary to ensure a stable and consistent electrical frequency for the ship's electrical system. The other options are incorrect because an isochronous governor is not the ideal choice for a ship's geared propulsion drive (A), a pump drive (B), or a direct reversible propulsion drive (C). These applications typically require a different type of governor, such as a droop governor, to properly regulate the engine speed and maintain the desired performance characteristics.