fluid friction
fluid turbulence
component misalignment
pressure surges
第1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2题：
Among the basic categories of equipment, which of the following is used to convert hydraulic energy into continuous rotary motion?
A.hydraulic pumps
B.valves
C.hydraulic cylinders
D.hydraulic motors
第3题：
A. failures because a data file is renamed by error
B. failures when no standby database is configured
C. failures that require no archive logs to be applied for recovery
D. failures due to loss of connectivity-for example, an unplugged disk cable
第4题：
第5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6题：
Among the basic categories of equipment, which of the following are used to convert the hydraulic energy into linear motion?
A.hydraulic pumps
B.valves
C.hydraulic cylinders
D.hydraulic motors
第7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8题：
Among the basic categories of equipment, which of the following are used to allow the hydraulic energy to be controlled?
A.hydraulic pumps
B.valves
C.hydraulic cylinders
D.hydraulic motors
第9题：
Advection fog is most commonly caused by ______.
A.air being warmed above the dew point
B.saturation of cold air by rain
C.a rapid cooling of the air near the surface of the Earth at night
D.warm moist air being blown over a colder surface
第10题：
Loop guard and UniDirectional Link Detection both protect against Layer 2 STP loops. In which two ways does loop guard differ from UDLD in loop detection and prevention？（）