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
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相关考题
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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 -
单项选择题
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 -
单项选择题
Which characteristic or condition will have the greatest effect on increasing a hydraulic oils viscosity?（）
A.Pour point
B.Cloud point
C.Vacuum
D.Pressure
