Engine General (Supplementary) USCG Question #396 (Set 6)

The rudder torque capacity of the four ram steering gear illustrated is rated at 44,210,000 inch-pounds with one power unit in operation. If the four ram system was able to be operated as a two ram system with both power units on line, what would be the available torque? GS-0067

USCG Exam Illustration GS-0067
USCG Examination Diagram: Illustration GS-0067
Official USCG Answer & Rule Citation

Correct Answer: Option B — 22,105,000 inch pounds

Torque in a hydraulic steering gear is directly proportional to the number of active rams. If a four-ram system is operated as a two-ram system, the effective piston area is halved. Consequently, the torque capacity is reduced proportionally to 22,105,000 inch-pounds, representing half of the total rated capacity.

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