单项选择题
When the desired rudder angle is attained by a typical double mm electro-hydraulic steering gear,the（）.
A.ram relief valves bypass oil to stop rudder movement
B.six-way valve shifts to the neutral flow position
C.steering pump electric motor is de - energized by the transfer switch
D.follow-up gear takes the hydraulic pump off stroke
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相关考题
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单项选择题
A swing check valve is used in a pipeline to （）.
A.maintain a preset pressure on the line
B.closely regulate the amount of flow
C.relieve excessive pressure on the line
D.allow flow in one direction only -
单项选择题
Sluggish response or action of the hydraulic actuators may be a result of （）.
A.insufficient load
B.excessively high oil viscosity
C.relief-valve pressure setting too high
D.reservoir level being maintained two inches above normal -
单项选择题
A knocking sound from one cylinder of an operating air compressor indicates （）.
A.a defective or broken high pressure un-loader
B.a loose valve plate
C.excessive overload
D.no compression
