🔍 Key Concepts

• Function of a steerable internal duct thruster in ship maneuvering • What part of the thruster changes the direction of thrust versus what controls pump speed or impeller vanes • Difference between inlet guide vanes, discharge deflector vanes, and impeller vanes

💭 Think About

• Ask yourself: which component of this kind of thruster actually turns or steers the jet to change the ship’s direction, without changing pump RPM? • Consider where a ‘vectoring’ device would most logically sit: at the inlet, at the discharge, or inside the rotating impeller? • Think about what ‘vectoring’ means in fluid terms: are you changing flow direction before the pump, inside the pump, or after the pump discharge?

✅ Before You Answer

• Verify which option clearly describes changing the direction (vector) of the thrust rather than speed or RPM control. • Identify which answer refers to discharge flow direction instead of inlet flow conditioning or impeller geometry. • Eliminate any choice that mainly describes controlling pump speed or impeller rotation, since vectoring is about direction, not RPM.