microscopic steel shavings
abrasive waste
anti-oxidant compounds
oxidation by-products
第1题：
Before doing any work on a hydraulic system equipped with accumulators, you should
A.drain the accumulators and purge with oxygen
B.bleed off all stored energy from the accumulators completely
C.charge the accumulators to prevent system energy loss
D.pump the hydraulic fluid into the accumulators to prevent fluid loss
第2题：
Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and ______.
A.fluid friction
B.fluid turbulence
C.component misalignment
D.pressure surges
第3题：
Overheating of the hydraulic fluid in an electro-hydraulic anchor windlass can result from a/an( ).
A.overload on the pump motor
B.low fluid level in the reservoir
C.low fluid viscosity around the shaft seal
D.high oil level in the sump
第4题：
As to chemical products we are well connected（）the major producers in America.
第5题：
The storage device for nitrogen-pressurized hydraulic fluid，which is used in closing the blowout preventers is called the ______．
A.Actuator
B.Annulus
C.Accumulator
D.Annular preventer
第6题：
Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by ______.
A.permanent loss of pump suction
B.worn shaft seals
C.high level in the oil sump
D.low motor RPM
第7题：
The major cause of trouble in a mechanical-hydraulic governor is contamination of the hydraulic fluid by ______.
A.dirt
B.fuel oil
C.governor cooling water
D.fuel oil tar(焦油)
第8题：
If you install a new hydraulic hose in a hydraulic system, the hose must be long enough to allow for contraction to prevent
A.failure of the hydraulic hose
B.excessive flow through the line
C.friction in other areas of the hydraulic system
D.overheating of the hydraulic fluid
第9题：
A hydraulic accumulator aboard a ship is designed to ______.
A.store fluid under pressure
B.act as a fluid reservoir
C.provide overpressure relief
D.replenish fluid to a system
第10题：
Relief valve
Direction control valve
Stop valve
Pressure control valve