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单选题
In a purifier changing to a gravity disc with larger hole diameter will move the interface towards the （）.
A
bowl periphery
B
bowl center
C
upper surface
D
lower surface
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There was a river with a small town on either side of it.The towns were linked by a bridge.
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The quarrel went on and on,and so did the hole.The more it went on,the more the hostility?between the two towns grew.
One day a man fell into the hole and broke his leg.People from both towns questioned him?closely about whether he was walking from the right bank to the left or from the left bank to the?right,in order to decide which town should be blamed for the accident.But he could not remember,since he got drunk that night.
Some time later.,a car was crossing the bridge and broke an axle(轴)because of the hole.Neither town paid any attention to the accident,as the traveler was not going from one to the other,but?was merely passing through.The angry traveler got out of the car and asked why the hole was not?mended.
On hearing the reason,he declared,"I′11 buy this hole.Who′s the owner?"
Both towns at once declared that they owned the hole.
"One or the other,whoever owns the hole must prove it."
"How shall we prove it?"asked both sides.
"That′s simple.Only the owner of the hole has the right to mend it.I′11 buy the hole from?whoever mends the bridge."
People from both towns rushed to do the job while the traveler smoked a cigar and his driver?changed the axle.They mended the bridge in no time and asked for the money for the hole.
"What hole?"The traveler looked surprised."I can′t see any hole.I′ve been looking for a?hole for several years now.I′m prepared to pay a good price for it,but there′s no hole here.Are?you pulling my leg or what?"
He got into his car and drove off.
The man who had fallen into the hole failed to answer any questions because he__________。《》（）A.had one of his legs broken
B.was busy changing the axle
C.had drunk too much wine
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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The （） of the gravity disc is too big It causes oil to flow through the water outletWe changed the disc and no oil is found in the water outlet.A
gravityB
diameterC
circumferenceD
cylinder
考题
单选题（）can cause oil flow from water outlet of a separator.A
Oil inlet valve opening too quicklyB
Oil temperature too highC
Diameter of gravity disc too smallD
Viscosity of oil too low
考题
单选题In a purifier changing to a gravity disc with larger hole diameter will move the interface towards the （）.A
bowl peripheryB
bowl centerC
upper surfaceD
lower surface
考题
单选题The diameter of the gravity disc is too big It causes oil to flow through the water outlet We changed the disc and no （） is found in the water outlet.A
waterB
oilC
scaleD
ridge
考题
单选题The size of the discharge ring used for the efficient operation of a disk type purifier is dependent upon the（）A
rated capacity of that purifierB
viscosity of the oil being purifiedC
maximum design speed of that purifierD
specific gravity of the oil being purified
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Which factor determines the ring dam size for a fuel oil, tubular bowl type, centrifugal purifier?（）A
The viscosity off the fuelB
The quantity of water to be removed from the fuelC
The specific gravity of the fuelD
The quantity of dirt to be removed from the fuel
考题
单选题High-speed rotation in a centrifugal purifier can produce a force （） the force of gravity.A
many thousand times larger thanB
the same asC
many thousand times smallerD
none of the above
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（）can not cause oil flow from water outlet of self-cleaning separator.A
Oil temperature too highB
Diameter of gravity disc too largeC
Oil temperature too lowD
High level tank out of water
考题
单选题High-speed rotating in a centrifugal purifier can produce a force （） larger than the force of gravity.A
many thousand timesB
between timesC
one timeD
at times
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