單項選擇題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


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題Rotation of the steering wheel on the navigation bridge initiates oil pressure being applied to the steering gear rams by ().

A.regulating the oil flow with the six-way valve
B.moving the automatic differential valve
C.moving the receiving tele-motor which regulates the two-way valve
D.varying the angle of a tilting box or eccentricity of a floating ring

5.單項選擇題When there is no movement of the rams on an electro-hydraulic steering gear, the tilting box of the running pump is ().

A.set for maximum torque
B.on the purge and vent stroke
C.in the neutral position
D.rotating backwards