单项选择题
Most hydraulic steering gears are fitted with relief valves which（）
A.function when the rudder is amidships
B.relieve excess whip pressure from the hydraulic oil system
C.protect the piping assembly from external rudder shock
D.relieve excessive telemotor pressure
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相关考题
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单项选择题
On an electro-hydraulic steering gear, which of the listed devices will keep the rudder from over-traveling the bridge signal?（）
A.Rudder angle indicator
B.Follow-up gear
C.Electric transmitter
D.Rudder angle limit switch -
单项选择题
Rudder motion is prevented from exceeding the movement of the steering wheel by the（）
A.return springs
B.six-way valve
C.follow-up gear
D.differential gear -
单项选择题
Air trapped in the hydraulic fluid of a steering system may be indicated by（）
A.the steering pumps overspeeding
B.a jammed open relief vale
C.a constantly occurring improper rudder response
D.excessive ram pressure
