更多"A gate valve installed in a pipelin"的相关试题:
[单项选择]A single fitting installed in a pipeline that either blanks off the pipe or allows a full flow passage of a liquid through the pipe is referred to as a（）.
A. blind flange
B. pivot coupling
C. quick-release coupling
D. spectacle flange
[单项选择]LFG tank and pipeline maintenance should include（）.
A. exclusion of all sand and solid matter
B. cleaning with clean fresh or sea water
C. examination for fractures and pitting
D. All of the above
[单项选择]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 operation
B. The globe valve will give full bore flow with change of direction
C. The gate valve gives full bore flow with change of direction
D. The gate valve is suitable for full bore operation only
[单项选择]A swing check valve is used in a pipeline to （）.
A. maintain a preset pressure on the line
B. closely regulate the amount of flow
C. relieve excessive pressure on the line
D. allow flow in one direction only
[单项选择]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
[单项选择]When start a screw pump, the by pass valve should be （）.
A. closed
B. opened fully
C. cracked open
D. partly open
[单项选择]The safety valve should be （） in the presence of C/E and Surveyor.
A. tightened up
B. sealed up
C. opened up
D. unscrewed
[单项选择]The humidifier’s valve of air-condition should be （）, when the temperature is lower than 0℃.
A. decreased
B. increased
C. fixed
D. closed
[单项选择]The humidifier’s valve of air-conditioner should be （）, when the temperature is 5~8°C in the winter.
A. decreased
B. increased
C. fixed
D. closed
[单项选择]Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）
A. closing later
B. opening sooner
C. staying open for a shorter period of time
D. staying open for a longer period of time
[单项选择]The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.
A. be jammed
B. be opened
C. be seated
D. be broken
[单项选择]A vessel servicing a pipeline during the day shall display（）.
A. three black shapes in a vertical line; the highest and lowest are balls，and the middle one is a diamond
B. three shapes in a vertical line; the highest and lowest are red balls，and the middle one is a white diamond
C. three black balls in a vertical line
D. two black balls in a vertical line
[单项选择]Intercoolers installed on starting air compressors, reduce the possibility of（）
A. dust entering the high pressure stage
B. lube oil carbonization
C. discharge pulsations
D. inter-stage vapor lock
[单项选择]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 valve
B. a pilot valve
C. an operating piston
D. downstream pressure
[单项选择]A thermostatic expansion valve is properly controlling evaporator superheatAdjusting this valve to lower the superheat will result in a/an （）.
A. evaporator pressure decrease
B. evaporator coil over-feed
C. evaporator capacity increase
D. expansion valve diaphragm rupture
[单项选择]Thermostatic expansion valve are （）.
A. either all the way open or all the way closed
B. normally open
C. throttled depending on load
D. controlled by suction pressure
[单项选择]Overflow valve is used to （）
A. control the fluid flow through it
B. prevent the pressure before it over the specified valve
C. make the pressure after it steady
D. control the direction of oil flow
