Question 351General Subjects - Assistant Engineer

70% to pass

With respect to the vectoring ring of a steerable internal duct thruster, what statement represents the operating principle of the vectoring ring?

AThe vectoring ring is used to control the orientation of the inlet guide vanes to the pump inlet.
BThe vectoring ring is used to control the orientation of the deflector vanes of the pump discharge.
CThe vectoring ring is used to control the speed and direction of rotation of the pump.
DThe vectoring ring is used to control the orientation of the vanes on the pump impeller.
AI Explanation

The correct answer is B. The vectoring ring of a steerable internal duct thruster is used to control the orientation of the deflector vanes of the pump discharge. The operating principle of the vectoring ring is to adjust the deflector vanes at the pump discharge, which changes the direction of the water flow and allows the thruster to provide thrust in different directions. This allows the vessel to be maneuvered more precisely. The other answer options are incorrect because they do not accurately describe the function of the vectoring ring. The vectoring ring does not control the inlet guide vanes, the speed and direction of the pump, or the impeller vanes.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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