hydraulic fluid contamination
excessive fluid friction
turbulent fluid flow
fluid pressure surges
Which two kinds of failures make the Data Recovery Advisor (DRA)generate a manual checklist? ()A. failures because a data file is renamed by errorB. failures when no standby database is configuredC. failures that require no archive logs to be applied for recoveryD. failures due to loss of connectivity-for example, an unplugged disk cable
点击查看答案
Among the basic categories of equipment, which of the following are used to allow the hydraulic energy to be controlled?A.hydraulic pumpsB.valvesC.hydraulic cylindersD.hydraulic motors
If you install a new hydraulic hose in a hydraulic system, the hose must be long enough to allow for contraction to preventA.failure of the hydraulic hoseB.excessive flow through the lineC.friction in other areas of the hydraulic systemD.overheating of the hydraulic fluid
Among the basic categories of equipment, which of the following are used to convert the hydraulic energy into linear motion?A.hydraulic pumpsB.valvesC.hydraulic cylindersD.hydraulic motors
Among the basic categories of equipment, which of the following is used to convert hydraulic energy into continuous rotary motion?A.hydraulic pumpsB.valvesC.hydraulic cylindersD.hydraulic motors
Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by ______.A.permanent loss of pump suctionB.worn shaft sealsC.high level in the oil sumpD.low motor RPM
Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and ______.A.fluid frictionB.fluid turbulenceC.component misalignmentD.pressure surges
