单选题A large valve，usually installed above the ram preventers，that forms a seal in the annular space between the pipe and wellbore or，if no pipe is present，on the wellbore itself is called the（）.Aannular blowout preventerBannulusCaccumulatorDautomatic choke
单选题
A large valve，usually installed above the ram preventers，that forms a seal in the annular space between the pipe and wellbore or，if no pipe is present，on the wellbore itself is called the（）.
A
annular blowout preventer
B
annulus
C
accumulator
D
automatic choke
参考解析
解析：
暂无解析
相关考题：
A summary WBS is usually developed in theAConceptual phaseBimplementation phaseCplanning phaseDclose-out phaseEAll of the above phases
The globe valve has a bulbous body, housing a valve seat and screw down plug or disc arranged at right angles to the axis of the pipeAccording to the above sentence, which of the following statements is not true?A.The profile of the valve is like a globeB.The valve seat is set into the bulbous bodyC.The plug or disc of the valve is made vertical to the axis of the pipeD.The valve seat is located at right side of the plug or disc
Banks will usually grant unsecured loans to ______.A．individuals with steady job held for yearsB．individuals with a good credit recordC．large commercial companies with a strong financial conditionD．all of the above
A large valve，usually installed above the ram preventers，that forms a seal in the annular space between the pipe and wellbore or，if no pipe is present，on the wellbore itself is called the ______.A.annular blowout preventerB.annulusC.accumulatorD.automatic choke
The valve on the discharge side of a cargo pump on a tank vessel will usually be a ______.A.butterfly valveB.spectacle valveC.check valveD.globe valve
Between 1960 and 1990,a large number of people moved from（）Acore cities to the suburbsBrural areas to citiesCsmall cities to large citiesDNone of the above
The oil is usually pumped into ship at the loading port by（）.A、ship’s own pumpsB、shore pumpsC、large pipesD、large tubes
单选题A more sophisticated pressure reducing valve incorporates a pilot valve which controls the fluid above the valve operating piston in response to downstream pressureThe bold and italic word “which” means （）.Aa pressure reducing valveBa pilot valveCan operating pistonDdownstream pressure
单选题Unlike the globe valve, gate valves give full bore flow without change of direction, such a valve is not suitable to partially open operationAccording to the above sentence, which of the following statements is not true?（）AThe globe valve may be suitable for partially open operationBThe globe valve will give full bore flow with change of directionCThe gate valve gives full bore flow with change of directionDThe gate valve is suitable for full bore operation only
单选题Each cylinder has one starting valve which is usually opened by air pressure and closed by （）Anuts and boltsBnew jointsCspring forceDsealing rings
单选题The（） is a smaller valve fitted in the auxiliary steam supply line, and is usually of the non-return type.Amain stem stop valveBauxiliary steam stop valveCfeed check or control valveDblow down valve
单选题Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）Aincrease back pressure during the exhaust processBfacilitate periodic replacement of the valvesCreduce the pumping loss associated with scavengingDreduce tension on valve springs
单选题A relief valve for a cargo pump is generally installed（）.Aafter the discharge valveBbetween the pump and discharge valveCafter the suction valveDbetween the pump and suction valve
单选题Moisture in a refrigeration system can cause （）.Afreezing the expansion valve closedBcorrosion of system pipingCimproper temperature regulationDall of the above
单选题After passing through the expansion valve the refrigerant should be in the state of （）.AvaporBliquidCsolidDNone of the above is tree
单选题During inspection of the machinery space, which of the following statements points to an unsatisfactory organization of the systematic maintenance?（）Amissing valve hand wheelsBdirty tank topsCa large number of temporary repairsDAll of the above
单选题A butterfly valve consists basically of a disc pivoted across the bore of a ring body having the same radial dimensions as the pipe in which it is fitted.According to the above sentence, which of the following statements is not true?（）AThe diameter of a disc is the same as the outer diameter of the pipeBWe can infer that the valve is opened or closed by rotating the spindleCA butterfly valve comprises a disc and a ring bodyDThe profile of the butterfly valve is a ring body
单选题The valve on the discharge side of a cargo pump on a tanker will usually be a（）.Abutterfly valveBspectacle valveCcheck valveDglobe valve
单选题Between 1960 and 1990,a large number of people moved from（）Acore cities to the suburbsBrural areas to citiesCsmall cities to large citiesDNone of the above
单选题Valve cages are used on some large diesel engines to （）Areduce wear on the valve stemBpermit the use of alloy valve seat materialsCreduce heat transfer from the valve seatDfacilitate valve removal for servicing
单选题What is the purpose of a relief valve?（）Ato fill 2 tanks at the same timeBto use pump at a higher pressureCto return liquid to suction side if discharge valve is closedDAll of the above are true
单选题The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）Aone valve seats upwards, while the other seats downwardsBthe reed valves used on the discharge are made substantially thicker and heavier than the suction valvesCthe suction valve springs exert a greater tension than the discharge valve springsDthe discharge valve springs exert a greater tension than the suction valve springs
单选题The valve on the discharge side of a cargo pump on a tank vessel will usually be a（）.Abutterfly valveBspectacle valveCcheck valveDglobe valve