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单选题
Before the sludge in a purifier is ejected,（）
A
the oil feeding is stopped and replaced by admitting flushing water
B
the flushing water feeding is stopped and replaced by admitting oil
C
the feeding of dirty oil and flushing water is stopped
D
the feeding of dirty oil and flushing water is admitted
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考题
Which of the following is NOT true about the centrifugal separator?
A.It can be applied to separate two liquidsB.It cannot separate solids which contaminated in the oil.C.It consists of purifier and clarifierD.The centrifuge arranged to separate two liquids is known as purifier
考题
If the bowl of a disk type centrifugal purifier when operated as a separator is not primed, theA.oil has a tendency to emulsify in the bowlB.purifier will act as a clarifier at the discharge ringC.oil will be lost through the water discharge portsD.oil solids will be deposited only at the intermediate top disk
考题
To ensure oil purifier working in normal condition, the interval between two sludge discharging should not exceed_______hours.A.2B.4C.5D.6
考题
One of the reasons that causes oil flowed from sludge outlet of a self-cleaning purifier isA.seal water supply be cut offB.make-up water supply be cut offC.oil outlet valve closed or not open sufficientlyD.the flow rate of oil is too much
考题
tell us briefly about the working principles of the purifier ,the oil water seperator and air compressor .
考题
单选题For a purifier changing to a gravity disc with smaller hole diameter will move the interface towards the（）.A
bowl peripheryB
bowl centerC
upper surfaceD
lower surface
考题
单选题A new ocean going ship of 2000 gross tons having an inoperative oily water separator may dispose of its bilge slops by （）.A
holding its slops onboard until they can be pumped into the city sewer systemB
circulating them through the lube oil purifier to remove water and debrisC
holding its slops onboard until they can be discharged to a shore side reception facilityD
pumping them into a settling tank for separation before pumping the oily water residue overboard
考题
单选题When does auxiliary burner of incinerator put into operation? （） Ⅰ. start incinerator when it is cold Ⅱ. the sludge for dealing with is little Ⅲ. the sludge for dealing with is large Ⅳ. the water and impurity in sludge are too much Ⅴ. the temperature in incinerator is low Ⅵ. dealing with little solid rubbishA
Ⅰ+Ⅱ+Ⅲ+ⅤB
Ⅰ+Ⅱ+Ⅲ+ⅣC
Ⅰ+Ⅳ+Ⅴ+ⅥD
Ⅰ+Ⅱ+Ⅲ+Ⅵ
考题
单选题When does auxiliary burner of incinerator put into operation? （） Ⅰ.tart incinerator when it is cold Ⅱ.he sludge for dealing with is little Ⅲ.he sludge for dealing with is large Ⅳ.he water and impurity in sludge are too much Ⅴ.he temperature in incinerator is low Ⅵ.ealing with little solid rubbishA
Ⅰ+Ⅱ+Ⅲ+ⅤB
Ⅰ+Ⅱ+Ⅲ+ⅣC
Ⅰ+Ⅳ+Ⅴ+ⅥD
Ⅰ+Ⅱ+Ⅲ+Ⅵ
考题
单选题The sludge tank installed in the diesel engine room is used to collect（） Ⅰ.sludge from the fuel oil settling tanks ad centrifuge Ⅱ.water that has been collected in the settling tankA
ⅠonlyB
Ⅱ onlyC
bothⅠand ⅡD
neitherⅠor Ⅱ
考题
单选题In a disk-type lubricating oil purifier, （）A
the purifier driving gears are lubricated by the reclaimedB
oil as it leaves the bowl all dirt and sludge are automatically discharged with the cooling waterC
sealing water must never be supplied until after oil is fed to the unitD
deterioration of the bowl ring gasket will cause the purifier to lose its water seal
考题
单选题A centrifugal fuel oil purifier should be shut down if （）A
more sealing water is neededB
the cover clamp needs tighteningC
the purifier has a bad vibration when startedD
water is discharged from the overflow line
考题
单选题（）can cause oil flow from sludge outlet of self cleaning separator.A
Too much sludge accumulated in separator bowlB
Diameter of gravity disc too largeC
High level tank lack of waterD
Oil input too rapidly
考题
单选题Concerning the management of sewage treatment plant using activated sludge, which of the following is correct?（）A
the plant should be prohibited to supplying airB
the plant should work at intervalsC
the plant should be added disinfector in timeD
we should check strength of activated sludge, ivory-white color is best
考题
单选题Sediment collects in a tubular purifier （）.A
on top coverB
on sides of bowlC
in drain line on the discsD
on the discs
考题
单选题Which of the following influences the position of the interface between the liquid seal and the oil in a purifier?（）A
Height of the machineB
Temperature of the liquid sealC
Gravity discD
Bowl diameter
考题
单选题They understand the （） of automatic sludge discharging of the purifierBut they are not good in practice.A
principleB
principalC
causeD
case
考题
单选题A BGP router should use three export policies named add-communities， no-rfc1918-routes， and rejected-unwanted. Which export statement places the add-communities policy immediately before the default BGP policy？（）A
export [add-communities no-rfc1918-routes ejected-unwanted]；B
export [no-rfc1918-routes add-communities rejected-unwanted]；C
export [add-communities rejected-unwanted no-rfc1918-routes]；D
export [no-rfc1918-routes rejected-unwanted add-communities]；
考题
单选题One of the reasons that causes oil flowed from sludge outlet of a self-cleaning purifier is （）A
seal water supply be cut offB
make-up water supply be cut offC
oil outlet valve closed or not open sufficientlyD
the flow rate of oil is too much
考题
单选题Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?（）A
Carbon particlesB
Lube oilC
GasolineD
Diesel fuel
考题
单选题To ensure oil purifier working in normal condition,the interval between two sludge discharging should not exceed（） hours.A
2B
4C
5D
6
考题
单选题The （）is used to burn oil sludge.A
clarifierB
oil/water separatorC
incineratorD
distiller
考题
单选题The oil sludge is burnt in the （）on board I’ll show you the ashes.A
boilerB
main engineC
auxiliary engineD
incinerator
考题
单选题Concerning the incinerator’s operation, which of the following is not correct?（）A
Scavenging time should be more 30 seconds before ignitingB
The temperature of sludge tank is 80~100℃C
First igniting the incinerator with diesel oil, when the temperature of health is about 600℃, the sludge oil drawn inD
The ash can be dumped into sea when the distance is more than 3 miles from land
考题
单选题One engine manufacturer recommends heavy fuel oil should not be heated above 80℃ to 95℃ (176 ℉ TO 203℉) before purificationThis upper limit should be observed to ensure against（）A
flattening of the bowl neoprene O-ringsB
operation within the explosive rang of the fuelC
excessive purifier operating pressuresD
excessive oil viscosity
考题
单选题Before the sludge in a purifier is ejected,（）A
the oil feeding is stopped and replaced by admitting flushing waterB
the flushing water feeding is stopped and replaced by admitting oilC
the feeding of dirty oil and flushing water is stoppedD
the feeding of dirty oil and flushing water is admitted
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