单选题When a flash-type evaporator is to be secured for an extended period of time, the entire unit should be drained, cleaned, and （）.Acompletely filled with saltwaterBfilled with de-scaling compoundCtightly closed to exclude airDvented to the atmosphere
单选题
When a flash-type evaporator is to be secured for an extended period of time, the entire unit should be drained, cleaned, and （）.
A
completely filled with saltwater
B
filled with de-scaling compound
C
tightly closed to exclude air
D
vented to the atmosphere
参考解析
解析：
暂无解析
相关考题：
The correct procedure for giving an auxiliary boiler a bottom blow, is to begin .A.when the boiler has been secured long enough for most solids to settleB.when the boiler has been cooled to ambient temperatureC.only after raising the water level to within 0.5 inch of the high water cutout onlyD.after bypassing the low pressure
Which one of the followings is not a right way to behave during mooring unmooring operation?—_______.A.Stay close to the towline at all timeB.Beware the bightsC.When operating the winch/windlass,ensure that yourself understand the controlsD.When the tug is being secured or let go, monitor the operation closely
A thermostatic expansion valve is properly controlling evaporator superheat. Adjusting this valve to lower the superheat will result in a/anA.evaporator pressure decreaseB.evaporator coil over-feedC.evaporator capacity increaseD.expansion valve diaphragm rupture
When the water produced from most evaporator is supplied for drinking purpose, it must be treated to ensure it is biologically pure and _____.A.slightly acidicB.slightly alkalineC.no saltyD.slightly bitter
The term used in levying customs duties when such are fixed at rates proportioned to estimated value of goods concerned is ______.A.ad valoremB.infiniteC.secureD.specific
A vessel is underway with a work stage rigged over the side. A seaman may work on the stage，but only when ______.A.wearing a life jacketB.wearing a safety harness secured to the stageC.wearing both a life jacket and a safety harness secured to the stageD.the vessel is not making way
When stowed on steel decks，the strongbacks and pontoons shall be secured with ______．A.Dunnage or other suitable materialB.other strongbacksC.hatch coversD.other pontoons
单选题The most important thing to remember when launching an inflatable liferaft by hand is to（）.Aopen the CO2 inflation valveBopen the raft containerCensure that the operating cord is secured to the vesselDinflate the raft on the vessel，then lower it over the side
单选题A flash-type evaporator discharges heated seawater into a chamber that is maintained at a pressure than the vapor pressure of the entering heated seawater, and subsequently the flashed water vapor thereby produced（）Alower condensingBhigher coolingClower coolingDhigher condensing
单选题The heated feed-water entering any flash chamber of a flash-type evaporator will（）Avaporize, with the un-flashed water remaining at the temperature at which it entered the flash chamberBvaporize, with the un-flashed eater equalizing to the saturation conditions existing in the f lash chamberCvaporize, with the remaining water a t a temperature greater than it entered the flash chamberDboil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber
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A vessel is underway with a work stage rigged over the side. A seaman may work on the stage，but only when（）.Awearing a life jacketBwearing a safety harness secured to the stageCwearing both a life jacket and a safety harness secured to the stageDthe vessel is not making way
单选题When a deck cargo is secured with chain or wire lashings and grab (pear) links，which statement is FALSE?（）AThe amount of take-up is limited by the length of the turnbuckleBAt the grab (pear) link，the slack end of chain should be led back and secured to the chain above the linkCThe lashings should be inspected each day and any slack taken upDThe turnbuckle should be secured with a stick or lock nuts
单选题Which of the following procedures should be carried out when a large, low-speed, diesel engine is operated with one cylinder secured?（）ALubrication to the defective cylinder should be increasedBCooling water temperature to the engine should be increasedCOnly the turbocharger speed should be reducedDEngine speed should be reduced
单选题Small droplets of water entrained in the flashed vapor produced in a flash-type evaporator, are removed by the （）Aspray pipesBdemistersCcondensersDsplash baffles
单选题The demisters installed in a flash-type evaporator serve to （）Adeaerate the first effect distillateBfilter the condensed flash vaporsCdeaerate the first and second effect distillateDremove small water droplets entrained in the flashed vapor
单选题When a refrigeration compressor is in the ‘off’ cycle, the thermal expansion valve will（）.Aalways be wide open when the compressor restartsBcontinue to operate as if the system were in operationCremain open until evaporator pressure equalizes, then close until the compressor restartsDalways be completely closed until the compressor restarts
单选题The bulb for the thermal expansion valve is located（）Ain the middle of evaporator coilsBnear the evaporator coil outletCnear the evaporator coil inletDon the bottom row of evaporator coils
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Anchors are prevent from running out when secured by the（）.AbrakeBdevil's clawCpawlsDAll of the above
单选题The heated feedwater entering any flash chamber of a flash-type evaporator will（）Avaporize, with the unflashed water remaining at the temperature at which it entered the flash chamberBvaporize, with the unflashed water equalizing to the saturation conditions existing in the flash chamberCvaporize, with the remaining water at the temperature greater than it entered the flash chamberDboil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber
单选题On a multistage flash-type evaporator, the flash chamber is （）Acombined as part of the salt water feed heaterBthe open area above the brine levels in the first and second stagesCcombined as part of the distillate coolerDanother term used to describe the vapor feed heater
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Under normal operating conditions, the highest temperature and pressure conditions existing in a flash-type evaporator will occur in the （）.Afirst stageBsecond stageCdistillate coolerDsalt water feed heater
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When securing a flash-type evaporator for an extended period of time, you should （）.Afill the unit with saltwaterBfill the unit with de-scaling compoundCcompletely drain the unitDtightly seal the unit to exclude air
单选题When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）AThe diesel oil must never be allowed to mix with the heavy fuelBThe temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valveCThe heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valveDThe heating steam must be secured before the diesel oil passes through the three-way valve