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）
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
参考答案
更多 “ 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 ” 相关考题
考题
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
考题
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
考题
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
考题
The storage device for nitrogen-pressurized hydraulic fluid，which is used in closing the blowout preventers is called the ______．A.ActuatorB.AnnulusC.AccumulatorD.Annular preventer
考题
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
考题
The oil is usually pumped into ship at the loading port by（）.A、ship’s own pumpsB、shore pumpsC、large pipesD、large tubes
考题
单选题Each inert gas system gas main must have an automatic shut down valve at the outlet of the gas production plant. This valve must close automatically upon（）.A
cargo pump failureB
blower failureC
deck seal low water levelD
low inert gas temperature
考题
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 （）.A
a pressure reducing valveB
a pilot valveC
an operating pistonD
downstream pressure
考题
单选题Factor influencing the position of the interface between the liquid seal and the oil in a purifier is （）.A
throughputB
back pressureC
gravity discD
None of the above is wrong
考题
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 preventerB
annulusC
accumulatorD
automatic choke
考题
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?（）A
The globe valve may be suitable for partially open operationB
The globe valve will give full bore flow with change of directionC
The gate valve gives full bore flow with change of directionD
The gate valve is suitable for full bore operation only
考题
单选题The（） is a smaller valve fitted in the auxiliary steam supply line, and is usually of the non-return type.A
main stem stop valveB
auxiliary steam stop valveC
feed check or control valveD
blow down valve
考题
单选题Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）A
increase back pressure during the exhaust processB
facilitate periodic replacement of the valvesC
reduce the pumping loss associated with scavengingD
reduce tension on valve springs
考题
单选题A relief valve for a cargo pump is generally installed（）.A
after the discharge valveB
between the pump and discharge valveC
after the suction valveD
between the pump and suction valve
考题
单选题Moisture in a refrigeration system can cause （）.A
freezing the expansion valve closedB
corrosion of system pipingC
improper temperature regulationD
all of the above
考题
单选题Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service?（）A
CopperB
Copper and carbonC
CarbonD
Bronze
考题
单选题After passing through the expansion valve the refrigerant should be in the state of （）.A
vaporB
liquidC
solidD
None of the above is tree
考题
单选题During inspection of the machinery space, which of the following statements points to an unsatisfactory organization of the systematic maintenance?（）A
missing valve hand wheelsB
dirty tank topsC
a large number of temporary repairsD
All of the above
考题
单选题The valve on the discharge side of a cargo pump on a tanker will usually be a（）.A
butterfly valveB
spectacle valveC
check valveD
globe valve
考题
单选题Valve cages are used on some large diesel engines to （）A
reduce wear on the valve stemB
permit the use of alloy valve seat materialsC
reduce heat transfer from the valve seatD
facilitate valve removal for servicing
考题
单选题What is the purpose of a relief valve?（）A
to fill 2 tanks at the same timeB
to use pump at a higher pressureC
to return liquid to suction side if discharge valve is closedD
All of the above are true
考题
单选题The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）A
one valve seats upwards, while the other seats downwardsB
the reed valves used on the discharge are made substantially thicker and heavier than the suction valvesC
the suction valve springs exert a greater tension than the discharge valve springsD
the discharge valve springs exert a greater tension than the suction valve springs
考题
单选题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
热门标签
最新试卷