网友您好, 请在下方输入框内输入要搜索的题目:

题目内容 (请给出正确答案)
单选题
A multistage centrifugal pump can be BEST described as having ().
A

two or more impellers housed together in one casing and mounted on a single shaft

B

a single stepped impeller mounted in a progressively staged casing

C

a large radial clearance between the impeller and casing to prevent overheating due to

D

an increase in the discharge velocity of the liquid with a corresponding decrease in pressure through the stages


参考答案

参考解析
解析: 暂无解析
更多 “单选题A multistage centrifugal pump can be BEST described as having ().A two or more impellers housed together in one casing and mounted on a single shaftB a single stepped impeller mounted in a progressively staged casingC a large radial clearance between the impeller and casing to prevent overheating due toD an increase in the discharge velocity of the liquid with a corresponding decrease in pressure through the stages” 相关考题
考题 The author's friend can best be described as______.A. selfishB. patientC. tactfulD. sympathetic

考题 Throttling in the _____ line of a centrifugal pump involves the risk of the pump cavitation.A.suctionB.exhaustC.pressureD.discharge

考题 RAID 5 can be BEST described as which of the following?() A. Mirroring with stripingB. Striping with dedicated parityC. Striping with distributed parityD. Independent disks with shared parity

考题 All of the following steps are taken in starting a centrifugal pump,EXCEPT to ______.A.Set the relief valveB.Check the lubrication systemC.Vent the pump casingD.Open the pump suction and discharge valves

考题 Which of the following is BEST described as a storage system that can be connected to multiple servers through a fiber channel?()A、JBODB、SANC、DASD、NAS

考题 单选题With respect to centrifugal pump impellers, which of the following descriptions represents the correct centrifugal pump classification? ()A Single stage or multistageB High pressure or low pressureC Open or close coupledD Horizontal or vertical

考题 单选题Shaft sealing in a centrifugal pump can be effected by ().A the mechanical sealB packed stuffing boxesC either A or BD neither A nor B

考题 单选题The author’s attitude toward television can best be described as _____.A sullenness at defeatB reconciliation with the broadcastersC righteous indignationD determination to prevail

考题 单选题Most pump manufacturers recommended that the discharge piping for centrifugal pumps be ().A one size larger than the pump discharge nozzleB the same size as the pump discharge nozzleC one size smaller than the pump discharge nozzleD installed with a short radius elbow at the pump

考题 单选题The author’s tone can best be described as which of the following?A Angry and subjectiveB Calm and objectiveC Analytic and ambivalentD Grim and self-satisfiedE Tentative and biased

考题 单选题The writer’s tone can best be described as one of ______.A reliefB humorC worryD solemnity

考题 单选题Increasing the speed of a centrifugal pump will result in an increase in its capacity Another means of increasing the capacity of a centrifugal pump is to increase the ().A diameter of the discharge piping, with all other factors remaining the sameB diameter of the suction piping, with all other factors remaining the sameC width of the impeller onlyD diameter of the impeller

考题 单选题All of the following steps are taken in starting a centrifugal pump,EXCEPT to().A set the relief valveB check the lubrication systemC vent the pump casingD open the pump suction and discharge valves

考题 单选题The capacity of a centrifugal pump can be increased by the installation of a larger diameter impeller Another means of increasing the pump capacity is to ().A increase speedB increase the size of the cardent assemblyC reduce wearing ring clearancesD change the pump to a close coupled arrangement

考题 单选题If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably().A excessive pump speedB excessive suction headC worn wearing ringsD gross pump misalignment

考题 单选题The purpose of the wearing rings used in a centrifugal pump is to ().A prevent an internal explosion in the pump when it is overheatedB enable a visual inspection of the pump while it is runningC insure a proper alignment of the pump coupling to the driverD accommodate for friction between the impeller and the easing

考题 单选题The most suitable pump for oily water separator feed duties is ().A a reciprocating pumpB a vane pumpC a centrifugal pumpD a triple screw pump

考题 单选题Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?()A The pump delivers full capacity when started, but gradually slackens off toan abnormally low flowB The pump packing gland overheats after short operating periodsC The motor over-current protective device continually shuts the pump downD Pounding noises can be heard at the pump suction chest

考题 单选题Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be ().A one size smaller than the pump suction nozzleB the same size as the pump suction nozzleC one size larger than the pump suction nozzleD installed with a short radius elbow at the pump

考题 单选题Which of the following pumps belongs to centrifugal pump?()A Piston pumpB Screw pumpC Diffuser pumpD Water-ring pump

考题 单选题Which of the following is BEST described as a storage system that can be connected to multiple servers through a fiber channel?()A  JBODB  SANC  DASD  NAS

考题 单选题RAID 5 can be BEST described as which of the following?()A  Mirroring with stripingB  Striping with dedicated parityC  Striping with distributed parityD  Independent disks with shared parity

考题 单选题On modern ships, centrifugal pump with a self-primer has replaced reciprocating pump as bilge pump because()A centrifugal pump is cheaper than reciprocating pumpB the size of centrifugal pump with same capacity is smaller than that of reciprocating pumpC centrifugal pump makes maintenance easier than reciprocating pump doesD all of the above

考题 单选题A centrifugal pump can’t supply water after startingYou should check ().A priming waterB power supplyC packing glandD bearing lubrication

考题 单选题If one hydraulic pump of an electro-hydraulic steering unit falls, the vessels steering can be initially and best maintained by using the ().A trick wheelB accumulatorC standby pumpD telemotor

考题 单选题Which of the listed conditions can lead to cavitation气穴in a centrifugal pump?()A Vapor pockets formed in the suction flow streamB Rough easing volute surfacesC Worn wearing ringsD Heavy fluid in the flow stream

考题 单选题Why are removable sleeves installed on centrifugal pump shafts?()A They make it easier to replace the pump shaft packingB They can be economically replaced as they wear outC They can be removed when it is necessary to lighten the weight of the pumpD They increase the strength of the shaft