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

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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

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