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
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
参考解析
解析：
暂无解析
相关考题：
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
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
Valves on steam-smothering lines to cargo tanks shall be set with ______．A.The master control valve shut and valves to individual cargo tanks shutB.The master control valve open and valves to individual cargo tanks shutC.The master control valve shut and valves to individual cargo tanks openD.All valves open
In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open ________．A.Globe valveB.Butterfly valveC.Gate valveD.Packless valve
What is an advantage of a gate valve over a butterfly valve ________．A.Less frequent maintenanceB.Faster operationC.CheaperD.More compact
It is usually unnecessary，and indeed often impossible，______every printed clause．A.to give rise toB.giving give rise toC.given give full effect toD.to give full effect to
单选题When the desired rudder angle is attained by a typical double mm electro-hydraulic steering gear,the（）.Aram relief valves bypass oil to stop rudder movementBsix-way valve shifts to the neutral flow positionCsteering pump electric motor is de - energized by the transfer switchDfollow-up gear takes the hydraulic pump off stroke
单选题The period of valve overlap is when （）.Athe inlet valve is openBthe exhaust valve is openCboth valves are closeDboth valves are open
单选题Valve overlap is the period during which （）.Athe inlet valve is openBthe exhaust valve is openCboth valves are closedDboth valves are open
单选题Which of the valves listed should be used either in the fully opened or the fully closed position?（）AA gate valveBA globe valveCAny check valveDAny needle valve
单选题What type of valve is used to direct the flow of hydraulic fluid?（）ARelief valveBDirection control valveCStop valveDPressure control valve
单选题Which of the following statements concerning butterfly valves is correct?（）ASpecial tools are required for lapping or grindingBIt is impossible to throttle flow with a butterfly valveCTo close the valve, it is only necessary to turn the handle a quarter of a turnDThe butterfly valve should never be used in a freshwater system
单选题Which of the following methods is used to prevent throttling of compressed air through the diesel engine air starting valves?（）AHolding the valve open for a long periodBIncreasing the starting air pressure usedCOpening the stating air valve quicklyDReducing the starting air valve size
单选题In a full flow type lube oil system, the bypass relief valve will lift due to （）Aa clogged filter elementBexcessive lube oil pump discharge pressureCexcessive lube oil flowDexcessively hot lube oil
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In setting the valves on a steam-smothering system on a tank vessel，the master control valve to cargo tanks should be（）.Aopen and individual tank valves openBopen and the individual tank valves closedCclosed and the individual tank valves closedDclosed and the individual tank valves open
单选题A gate valve installed in a pipeline should be （）.Aused in either the fully dosed or fully opened positionBinstalled with the stem downCused for steam service onlyDused to throttle or regulate the flow of liquid
单选题The valve which is most suited for regulating the flow through a pipeline is a （）Agate valveBglobe valveCswing-check valveDplug-cock valve
单选题Diesel engine valve springs function to （）Ahold the valves openBkeep the valves off their seats until the exhaust stroke is completedCclose the valvesDopen inlet valves when the air injection cycle begins
单选题Starting air valves are held firmly on their seats by（）Acam rollers on the camshaftBspring forceCair pressure on top of the valve differential pistonDair pressure on the bottom of the valve differential piston
单选题To maintain the down stream pressure within defined limits over a range of flow and despite any changes in supply pressure, （） is fitted.Aa check valveBa gate valveCa pressure reducing valveDa quick closing valve
单选题In a refrigeration system, which of the following statements describes the actions occurring when a solenoid valves, used in conjunction with an unloader head is energized?（）AThe solenoid valves directs high pressure gas to the valve lifting device raising the suction valve off its seat and causing one specific cylinder to become unloadedBThe solenoid valves directs high pressure gas to the underside of the unloading piston, causing it to rise and allowing the recirculating ports to be openedCWhen the solenoid valve becomes energized, the valve ports become closed, allowing discharge pressure to build up above the piston, shifting it and causing it to unloadDThe solenoid valve allows the refrigerant to pass from the suction chamber to the top of the unloader piston, causing the piston to lift and unload the cylinder
单选题Cocks and valves control or interrupt flow, and have internal passages arranged so that they can be restricted or closed: in cocks, by rotating the plug, and in valves, by lowering, raising or rotating a disc in relation to a seating surfaceAccording to the above sentence, which of the following statements is not true?（）AFlows of fluids can be restricted by both cocks and valvesBThere are seats in the internal passages of valvesCA disc of valve only moves up and downDWe can infer that there is a bore in cock ping
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In some type of two-stroke engines, besides some small holes for（）, starting valve, safety valve, indicator cock, and central opening in each cylinder cover for mounting the（）Afuel valves；exhaust valveBexhaust valves；inlet valveCfuel valves；inlet valveDexhaust valves；fuel valve
单选题In setting the valves on a steam-smothering system on a tanker，the master control valve to cargo tanks should be（）.Aopen and individual tank valves openBopen and the individual tank valves closedCclosed and the individual tank valves closedDclosed and the individual tank valves open
单选题The timing of diesel engine air starting valves is controlled by（）Athe air start valve timing gears and rodsBa cylinder check valveCindividual cams and valve gearDan air manifold poppet valve
单选题While on watch in the engine room, you hear a continuous sounding of the general alarmWhich of the following actions should you take FIRST?（）ASecure the burners then proceed to your assigned boat stationBStart the fire pump and establish flow to the fire mainCOpen the guardian valve and standby to maneuverDOpen the master control valves on the fixed CO2 system