excessive internal leakage in the pump
low discharge pressure and fluid flow
excessive fluid level in the hydraulic reservoir
operation of the pump at 100% efficiency
第1题：
If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause may be ______.
A.high steam pressure in the boiler
B.abnormally high feed-water temperature
C.abnormally high boiler water temperature
D.steam demand exceeding feed pump capacity
第2题：
The item ______ is not the advantage of the hydraulic winch．
A.less jerky starts
B.less jerky stops
C.overheating worries
D.none of the overheating worries
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：
excessive drive motor speed
excessive pump discharge pressure
too low of a tilting box angle
insufficient drive motor speed
第5题：
If one hydraulic pump of an electro-hydraulic steering unit fails, the vessel’s steering can be initially and best maintained by using the ______.
A.trick wheel
B.accumulator
C.standby pump
D.Telemotor
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：
Which statement about inert gas pressures in a cargo tank is TRUE ________．
A.The pressures of the inert gas in the tank may create excessive pressure at the pump while discharging
B.Gas pressures should be maintained at the highest permissible level throughout the discharging process
C.High gas pressures may cause pyrophoric oxidation in the tank
D.High gas pressures may cause loss of suction when stripping
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：
ram relief valves bypass oil to stop rudder movement
six-way valve shifts to the neutral flow position
steering pump electric motor is de - energized by the transfer switch
follow-up gear takes the hydraulic pump off stroke
第10题：
changing pump discharge pressure in response to normal load variations
a high oil level
incorrect fluid viscosity
continued slow re-circulation of the oil