Engine General (Supplementary) USCG Question #1223 (Set 23)

If oil under pressure is supplied to the area noted as "N" on the vane in the illustration __________. GS-0116

Official USCG Answer & Rule Citation

Correct Answer: Option C — "O" will rotate counter-clockwise as oil is returned from the area between "M" and "I"

In a vane-type steering actuator, applying hydraulic pressure to chamber N forces the vane to rotate. As the vane moves, fluid must be displaced from the opposing chamber to allow rotation. This displacement results in counter-clockwise rotation of the assembly O as fluid returns to the pump.

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