单选题High-speed rotation in a centrifugal purifier can produce a force （） the force of gravity.Amany thousand times larger thanBthe same asCmany thousand times smallerDnone of the above
单选题
High-speed rotation in a centrifugal purifier can produce a force （） the force of gravity.
A
many thousand times larger than
B
the same as
C
many thousand times smaller
D
none of the above
参考解析
解析：
暂无解析
相关考题：
Coal _____to produce electricity for agriculture and industry. A.can useB. can be usedC.is to useD. is using
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
Which factor determines the ring dam size for a fuel oil, tubular bowl type, centrifugal purifier?A.The viscosity of the fuel.B.The quantity of water to be removed from the fuel.C.The specific gravity of the fuel.D.The quantity of dirt to be removed from the fuel.
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
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 smaller thanD.which has nothing to do with
The high-speed trains can have a major impact on our lives.A:effortB:problemC:concernD: influence
he IBM System Storage TS7650G ProtecTIER Deduplication Gateway solution offers industryleading inline deduplication performance and scalability up to which one of the following?（）A、1 PB of physical storage capacity per system that can produce up to 25 PB of storage capacity B、2 PB of physical storage capacity per system that can produce up to 30 PB of storage capacity C、5 PB of physical storage capacity per system that can produce up to 125 PB of storagecapacity D、10 PB of physical storage capacity per system that can produce up to 40 PB of storagecapacity
单选题Shaft sealing in a centrifugal pump can be effected by （）.Athe mechanical sealBpacked stuffing boxesCeither A or BDneither A nor B
单选题In describing engine operation, what does the term “cycle” mean?（）AThe sequence of events that produce a power pulseBOne rotation of the engine crankshaftCOne stroke of a pistonDAll of the above
单选题If the bowl of a disk type centrifugal purifier when operated as a separator is not primed, the（）Aoil has a tendency to emulsify in the bowlBpurifier will act as a clarifier at the discharge ringCoil will be lost through the water discharge portsDoil solids will be deposited only at the intermediate top disk
单选题What is a characteristic of all centrifugal cargo pumps? （）AThey are self-primingBDecreasing the speed of rotation will decrease the discharge pressureCOpening the discharge valve wider will increase the discharge pressureDAll of the above
单选题Which of the following statements is true concerning centrifugal pumps?（）AThey are particularly suited for pumping high viscosity fluidsBThey are started with the discharge valve openedCThe flow of liquid is developed by imparting energy due to the rotation of an impellerDThey are always mounted in a horizontal position
单选题A centrifugal impeller consists of a number of vanes curving （） from the direction of rotation.AbackwardsBforwardsCupwardDdownwards
单选题Which factor determines the ring dam size for a fuel oil, tubular bowl type, centrifugal purifier?（）AThe viscosity off the fuelBThe quantity of water to be removed from the fuelCThe specific gravity of the fuelDThe quantity of dirt to be removed from the fuel
单选题A centrifugal fuel oil purifier should be shut down if （）Amore sealing water is neededBthe cover clamp needs tighteningCthe purifier has a bad vibration when startedDwater is discharged from the overflow line
单选题To absorb the wear resulting from impeller rotation and abrasives in the liquid, a centrifugal pump is usually fitted with （）.Alantern ringsBbearingsCeasing volutesDwearing rings
单选题Which of the following problems will occur if a disk-type centrifugal lube oil purifier is not properly primed prior to admitting oil flow to the bowl?（）AContamination of the lube oil by emulsification will resultBThe lube oil will not be subjected to the proper centrifugal forceCThe lube oil will overheat and flashDOil will discharge from the heavy phase discharge port and be wasted
单选题Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?（）ACarbon particlesBLube oilCGasolineDDiesel fuel
单选题The correct phase rotation of a three-phase alternator can be checked with a（）AdynamometerBpower factor meterCthree-phase motorDpolyphase voltmeter
单选题Centrifugal pumps, however, can be designed with a number of impellers （） to attain a large amount of liquid.Ain seriesBin parallelCassembledDtogether
单选题Centrifugal pumps are popular because they are very simple in construction,and produce smooth, constant, （） discharge.Anon-pulsatingBpulsatingCpositiveDnon-positive
单选题Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?（）AImpuritiesBLube oilCGasolineDDiesel fuel
单选题he IBM System Storage TS7650G ProtecTIER Deduplication Gateway solution offers industryleading inline deduplication performance and scalability up to which one of the following?（）A1 PB of physical storage capacity per system that can produce up to 25 PB of storage capacity B2 PB of physical storage capacity per system that can produce up to 30 PB of storage capacity C5 PB of physical storage capacity per system that can produce up to 125 PB of storagecapacity D10 PB of physical storage capacity per system that can produce up to 40 PB of storagecapacity
单选题If the engine is naturally aspirated, or is a small high-speed type with a centrifugal turbocharger, the period of valve overlap（）,ie when both valves are（）, will be and the exhaust valve will close some 10°top dead canter（）.Aopen；short；afterBclosed；short；afterCopen；long；beforeDclosed；long；before
单选题High-speed rotating in a centrifugal purifier can produce a force （） larger than the force of gravity.Amany thousand timesBbetween timesCone timeDat times