Which of the following statements is true about an axial compressor disk-type rotor?

Correct Answer: Option C — Rotor disks are shrunk fit onto a steel shaft.

Axial compressor rotor disks are typically shrunk fit onto a splined or keyed steel shaft to ensure a rigid, concentric assembly capable of handling high rotational speeds and torque. This method provides the necessary structural integrity and alignment required for the high-pressure ratios found in modern marine gas turbines.