When a vacuum boiling evaporator works, the hot jacket water will pass over the tube stack and ___ the sea water passing through the tubes.A.disposeB.dissolveC.heatD.dissipates
When a vacuum boiling evaporator works, the hot jacket water will pass over the tube stack and ___ the sea water passing through the tubes.
A.dispose
B.dissolve
C.heat
D.dissipates
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The medicine works more effectivelyyou drink some hot water after taking it.A as B until C althoughD if
In a()boiler the hot gases from the furnace pass gases from the furnace pass water is on the outside. A.water-tubeB.fire-tubeC.exhaust gasD.composite
In a ______boiler the hot gases from the furnace pass through the tubes while the water is on the outside.A.water-tubeB.fire-tubeC.exhaust gasD.Composite
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
单选题The fresh air intake of the inert gas system（）.Aprevents the flue gas from falling below 3% content of oxygenBallows the inert gas piping to be used for gas freeing the tanksCopens when there is excessive vacuum on the deck water sealDenables outside air to mix with and cool hot flue gasses
单选题The vacuum maintained in the salt water feed heater shell of a flash-type evaporator is generally accomplished by （）.Aa separate air ejector unitBa direct unimpeded connection between second stage and salt water feed heaterCeither by vacuum drag or an external line from the first stage via a fixed orificeDthe fixed orifice provided in the steam supply line
单选题When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.Ato decrease scale formationBfor better cooling effectCfor more economical purposeDto raise vacuum
单选题Diesel engine jacket water is used in the distillation process as the （）.Acoolant for the distillateBcoolant for the brine coolerCmeans of heating the feedwaterDprimary means of producing a vacuum within the distiller
单选题The three conditions which cause engine shutdown are overspeed，low lube oil pressure，and（）.AHigh lube oil pressureBHigh jacket water pressureCHigh jacket water temperatureDLow jacket water pressure
单选题Which of the following statements concerning the water tube and fire tube boilers is not true?（）Anatural circulation of the water in the water tube boiler is better than that in the fire tube boilerBfor the same output the water tube boiler will carry less mass of water compared with the fire tube boilerCthe water tube boiler will cost shorter time for steam raisingDthe water tube boiler require lower skill in operating and maintaining
单选题What is the operating principal of a flash type evaporator?（）ASea water is heated to boiling temperature under a vacuumBSea water is passed over heated plates in a thin filmCHeated sea water is injected into a vacuum chamberDSea water is forced through a heated eductor
单选题In a （） boiler the hot gases from the furnace pass through the tubes while the water is on the outside.Awater-tubeBfire-tubeCexhaust gasDNone of the above is true
单选题Less scale formation occurs in a flash evaporator than in a submerged tube evaporator because （）.Athe distillate produced has greater purityBno boiling occurs on heat transfer surfacesCevaporation occurs at a higher rateDthe incoming feed is at a higher temperature
单选题When the water produced from most evaporator is supplied for drinking purpose, it must be treated to ensure it is biologically pure and （）.Aslightly acidicBslightly alkalineCno saltyDslightly bitter
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The advantages of flash type evaporators, as compared to submerged tube type evaporators, include （）.Aless internal corrosion because of lower brine densityBhigher temperature evaporation for lower salinity of the distillate producedCless scale formation in a flash evaporatorDless feed-water required for a flash evaporator
单选题Why will a two stage flash type distilling plant tend to operate more efficiently when operating in cold seawater?（）AThe colder seawater passing through the condenser tube bundles of the various stages increases evaporator vacuumBThe amount of heated feed water discharged from the feed water heater after cndenser is increasedCFewer non-condensable gases are created by the flow of colder seawaterDMore seawater is allowed to pass through the flint stage overflow weir
单选题In （）, hot diesel engine jacket water passes over the stack and heats the sea water passing through the tubes.Aa flash generatorBa flash evaporatorCa vacuum boiling evaporatorDa boiler
单选题With a vacuum boiling evaporator, the remainder of sea water fed to the evaporator is pumped out by （）.Aa brine pumpBan air ejectorCa feed pumpDdistillate pump
单选题Because of the reduced （） in the vacuum boiling evaporator, some of the sea water boils as it flows through the tubes.AtemperatureBwater levelCpressureDrate of flow
单选题Which of the following descriptions best identifies the operating principal of a flash-type evaporator?（）ASea water is heated to boiling temperature while under a vacuumBSea water is passed over heated plates in a thin filmCHeated sea water is injected into a vacuum chamberDSea water is forced through a heated eductor
单选题Which of the listed conditions will cause the feed water that has not flashed to vapor in the first-stage of a flash evaporator, to flow into the second-stage?（）AGravity siphon effectBHigher vacuum in the second-stageCDifference in brine density between first and second stagesDlower pressure in first-stage
单选题On which of the following heated surfaces of a flash type evaporator would you be more likely to find soft scale formation?（）AFeed-water heater internal tube surfacesBInternal distillate cooler tubesCFlash chamber vertical surfacesDDistilling condenser tubes
单选题In a vacuum boiling evaporator, the fresh water generated is pumped out by （）.Aa brine pumpBan air ejectorCa feed water pumpDa condensate pump
单选题When a vacuum boiling evaporator works, the hot jacket water will pass over the tube stack and （） the sea water passing through the tubes.AdisposeBdissolveCheatDdissipates
单选题In more recent years, （） heat exchangers have frequently been employed for jacket water and oil cooling.Ashell and tube typeBplate typeCcoil typeDconical disc type