Engineering · Propulsion — CPP
A controllable-pitch propeller (CPP) allows a vessel to change thrust and go astern while the engine:
- AReverses rotation each time
- BRuns only at idle
- CIs shut down
- DContinues to rotate in one direction at constant speed✓ Correct
Explanation
A CPP varies blade pitch hydraulically to control ahead/astern thrust without reversing or stopping the engine. This permits constant-speed operation (useful for shaft generators) and rapid maneuvering response.
Authority: Modern Marine Engineer's Manual; CPP systems
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