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单选题 Which of the following statements concerning butterfly valves is correct
学科：默认课程
时间：2026-01-03 05:02:55
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题目1单选题
Which of the valves listed should be used either in the fully opened or the fully closed positionA. A gate valveB. A globe valveC. Any check valveD. Any needle valve
题目2单选题
A gate valve installed in a pipeline should be _____A. used in either the fully closed or fully opened positionB. installed with the stem downC. used for steam service onlyD. used to throttle or regulate the flow of liquid
题目3单选题
A check valve is another name for _____A. a test valveB. an inspection valveC. a stop valveD. a non-return valve
题目4单选题
The valve best suited for throttling gas or liquid flow in a pipeline is the _________A. gate valveB. globe valveC. check valveD. plug cock
题目5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 operation. According to the above sentence, which of the following statements is NOT trueA. 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 without change of directionD. The gate valve is suitable for full bore operation only
题目6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 trueA. The diameter of a disc is the same as the outer diameter of the pipeB. We can infer that the valve is opened or closed by rotating the spindleC. A butterfly valve comprises a disc and a ring bodyD. The profile of the butterfly valve is a ring body
题目7单选题
Which of the following statements concerning butterfly valves is correctA. Special tools are required for lapping or grindingB. It is impossible to throttle flow with a butterfly valveC. To close the valve, it is only necessary to turn the handle a quarter of a turnD. The butterfly valve should never be used in a freshwater system
题目8单选题
A valve is a device that regulates, directs or ______ the flow of a fluidA. controlsB. increasesC. decreasesD. maintains
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