单选题The（）enables water to be blow down or emptied from the boilerIt may be used when partially or completely emptying the boiler.Amain stem stop valveBauxiliary steam stop valveCfeed check or control valveDblow down valve
单选题
The（）enables water to be blow down or emptied from the boilerIt may be used when partially or completely emptying the boiler.
A
main stem stop valve
B
auxiliary steam stop valve
C
feed check or control valve
D
blow down valve
参考解析
解析：
暂无解析
相关考题：
The thins brought down by rivers from the mountains that are useful for cultivation are______.A. deltasB. cropsC. fresh water lifeD. soil and minerals
The fresh air intake of the inert gas system ______，A.Prevents the flue gas from falling below 3% content of oxygenB.Allows the inert gas piping to be used for gas freeing the tanksC.Opens when there is excessive vacuum on the deck water sealD.Enables outside air to mix with and cool hot flue gasses
Topside area from deep loadline to bulwark to be thoroughly washed down with ______．A.highly pressure fresh waterB.high pressured fresh waterC.highly pressured fresh waterD.high pressure fresh water
An inflatable life raft is thrown into the water from a sinking vessel. What occurs automatically after the painter trips the CO2 bottles to inflate the raft?______.A.The sea anchor deploysB.The floor inflatesC.If upside down, the craft rights itselfD.The painter detaches from the raft
共用题干Obtaining Drinking Water from Air HumidityNot a plant to be seen,the desert ground is too dry.But the air contains water,and research scientistshave found a. __________(51)of obtaining drinking water from air humidity."The process we have developed is based exclusively on renewable energy sources_________(52)thermal solar collectors andphotovoltaic（光电的）cells , ________( 53 ) makes this method completely energy-autonomous. It will ____________( 54 ) function in regions where there is no electrical infrastructure（基础设施）,"says Siegfried Egner,head of the research team. The principle of the_________(55)is as follows:hygroscopic（吸湿的） brine（盐水）一saline（含盐的）solution which absorbs moisture一runs down a tower-shaped unit and absorbs water from the air. It is then sucked__________(56)a tank a few meters off the ground in which a vacuum prevails.Energy from solar collectors_________(57)up the brine,which is diluted by the water it has__________ (58).Because of the vacuum,the boiling point of the liquid is lower than it would be under__________(59) atmospheric pressure. The evaporated (蒸发的）, non-saline water is condensed and runs down through a completely filled tube in a controlled manner. The gravity of this water column_______(60)produces the vacuum and so a vacuum pump is not needed.The reconcentrated brine________(61)down the tower surface again to absorb moisture from the air."The concept is suitable for various water________(62).Single一person units and plantssupplying water to entire hotels are conceivable,"says Egner. Prototypes have been built for_______(63)system components一air moisture absorption and vacuum evaporation一and the research scientistshave already __________(64)their interplay on a laboratory scale.In a further ________(65)the re- searchers intend to develop a demonstration facility._________(51)A:roadB:channelC:wayD:path
Node Manager is a WebLogic Server （） that enables you to start， shut down， and restart Administration Server and Managed Server from a remote location.A、 InstanceB、 UtilityC、 DestinationD、 Ouster
单选题A shallow dish positioned at the normal water level is connected to the（）This enables the blowing down or removal of scum and impurities from the water surface.Amain stern stop valveBauxiliary steam stop valveCscum valveDblow down valve
单选题Node Manager is a WebLogic Server （） that enables you to start， shut down， and restart Administration Server and Managed Server from a remote location.A InstanceB UtilityC DestinationD Ouster
单选题An inflatable liferaft is thrown into the water from a sinking vessel. What occurs automatically after the painter trips the CO2 bottles to inflate the raft?（）AThe sea anchor deploysBThe floor inflatesCIf upside down，the craft rights itselfDThe painter detaches from the raft
单选题While maneuvering, you discover heavy smoke coming from the turbocharger casing, you should （）Acheck the air filter for dirtBcheck for an exhaust leakCcheck the cooling water temperatureDnotify the bridge that you are going to shut the engine down
单选题Your vessel is damaged with no list，but down by the stern. There is progressive flooding and trim by the stern is increasing. What is the effect on transverse stability after the deck edge at the stern is submerged?（）AKB increases，increasing BM and therefore GMBKG increases due to the weight of the added water on deckCBM decreases from loss of water plane and greater volumeDThere is no effect on transverse stability
单选题The（）enables water to be blow down or emptied from the boilerIt may be used when partially or completely emptying the boiler.Amain stem stop valveBauxiliary steam stop valveCfeed check or control valveDblow down valve
单选题Bottom blow valves are installed on auxiliary water-tube boilers to （）Aremove suspended and precipitated solids from the boiler waterBcompletely drain the boiler in an emergency situationCprevent hardened scale deposits in the water drumDremove floating impurities from the oily water surface
单选题A diesel engine fails to start because of water in the fuelIn order to start the engine, you should （）?Aturn engine with jacking gearBdrain filters and strainers and bleed off water at each injection pumpCuse ether to start the engine with blow-down valves openDblow through the cylinders and fuel lines with a drying agent
单选题Clouds form（）.Aas a mass of warm，humid air rises into the atmosphere and cools，condensing moisture into small dropletsBas winds blow across bodies of water，the sun causes the moisture to be absorbed and move upward forming cloudsCdry air compresses moisture from the atmosphere into cloudsDwhen the relative humidity of the atmosphere is low
单选题The donkey boiler may be given a bottom blow （）Ato raise water levelBonly while making steamCto remove scumDwhen fire are secured
单选题The valve that prevents water from backing out of the boiler into the feed line is the（）.Abottom-blow valveBskin valveCfeed-check valveDfeed-stop valve
单选题When distilling salt water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.Ato cut down the amount of cooling water neededBto prevent an excess amount of cooling water from being discharged to the bilgesCto supply hot water to the evaporator for more economical operationDNone of the above is tree
单选题A centrifugal fuel oil purifier should be shut down if （）Amore sealing water is neededBthe cover clamp needs tighteningCthe purifier has a bad vibration when startedDwater is discharged from the overflow line
单选题Before the oily water separator put into operation, it should be （）Afilled with bilge waterBfilled with oilCfilled with clean waterDbe emptied
单选题（） will be used to blow away soot and the combustion products from the tube surfaces.AThe blow down valveBThe scum valveCThe air release cockDScot-blower
单选题Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?（）AExcessive piston blow-by to the manifoldBInsufficient cooling water flowCAccumulated water in the air boxesDClogged air intake filters
单选题If in doubt as to the true water level when a boiler is being oil-fired, you should （）.Atake no measuresBextinguish the fire as soon as possibleCfeed water to the boilerDopen the blow down valve
单选题How dose water enter the crankcase of a diesel engine?（）AThrough the crankcase exhausterBAs water vapor contained in blow-byCDemulsifying lube oil passing through the main bearingsDCondensation from vapor formed in the expansion tank
单选题Impurities from the boiler water surface can be removed through the （）.Asafety valveBblow down valveCscum valveDfeed check valve
单选题Bottom blow valves are installed on auxiliary water-tube boilers to （）Acompletely drain the boiler in an emergencyBprevent sludge from forming in the drumCremove floating impurities from the boiler water surfaceDremove settled solids from the water drum
单选题Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinderIf the cooling water temperature from all cylinders begins to rise above normal, you should suspect （）Aincrease blow-by in all cylindersBincomplete combustion in all cylinderCoverloading in all cylindersDinsufficient fuel delivery to all cylinders
单选题If an operating auxiliary boiler has a water pH reading of 7, you should （）.Abottom blow the boilerBtreat the water with caustic sodaCtreat the water with chemical scavengersDreduce the water alkalinity to recommended readings