Question 663General Subjects - Assistant Engineer

70% to pass

Hydraulically, servo-operated, automatic, change over valves, utilized in a two ram hydraulic steering gear, serve to _______________.

Aallow an alternate main pump to start in the fully loaded condition thus developing immediate full torque
Bprevent both units from operating simultaneously which could result in doubling the flow of oil and pressure leading to over pressurization of the system
Cprevent either main pump from being hydraulically motored when idle by cross pressure flow
Dall of the above
AI Explanation

The correct answer is C) prevent either main pump from being hydraulically motored when idle by cross pressure flow. Servo-operated, automatic, change over valves in a two-ram hydraulic steering gear system are designed to prevent the idle pump from being hydraulically motored by the active pump. This cross-pressure flow could potentially lead to damage or malfunction of the idle pump. By preventing this unwanted hydraulic motoring, the valves ensure the integrity and reliable operation of the overall steering system. The other answer choices, while related to hydraulic system design, do not directly address the specific function of the change over valves in preventing hydraulic motoring of the idle pump.

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