單項選擇題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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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題The purging of air from an elector-hydraulic steering gear unit is necessary when（）

A.changing over to hand pump operation
B.engaging the trick wheel
C.the system has been filled with new oil
D.the rudder angle indicator does not match the helm position

5.單項選擇題If a severe leak develops in the electro-hydraulic steering gear unit is necessary when（）

A.Loss of vessel steering
B.Overheating of the gyrocompass
C.Jamming of the six-way vale
D.Jamming of the follow-up device