Why is it necessary to have routine testing of the cooling water?A.To ensure that the proper residuals of treatment chemicals, as specified, are maintained all timeB.To trace leakage in the cooling water systemC.It is not necessaryD.To detect the presence of contaminants in the water that may be injurious to the cooling system
Why is it necessary to have routine testing of the cooling water?
A.To ensure that the proper residuals of treatment chemicals, as specified, are maintained all time
B.To trace leakage in the cooling water system
C.It is not necessary
D.To detect the presence of contaminants in the water that may be injurious to the cooling system
相关考题：
—Why does the stream smell terrible? —Because large quantities of water_____. A、have pollutedB、is being pollutedC、has been pollutedD、have been polluted
What is head tank in the closed cooling water system used for?A.for the release of air from the cooling waterB.providing expansion room for heated cooling waterC.a place for implementing water and water treatment agentD.all of the above
What a waste! Why do you () the water () all the time ? A、have…flowingB、have…flowC、have…to flowD、have…flowed
Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?A.Baffle plates that have been bent during prior removalB.Leaks m the cooler tube nestC.Operating the engine while maintaining a high sea water outlet temperatureD.A punctured sea water strainer supplying cooling water to the heat exchanger
Why is it necessary to warn engine room personnel before activating the fixed CO2 system?A.To make them aware there is a fireB.To let them know they should leave the engine roomC.To prevent possible injury from frostbiteD.To make them aware that ventilation will automatically stop
--Why does the Lake smell terrible?--Because large quantities of water .A. have polluted B. is being polluted C. has been polluted D. have been polluted
High diesel engine cooling water temperatures can be caused by ______.A.air in the cooling systemB.an overhauled water pumpC.correct amount of coolantD.no air in the cooling system
Why is it necessary to extend ventilators of gasoline powered vessels to the bilges ________．A.To keep them dry，and thus easier to cleanB.To remove fuel vapors which are heavier than airC.To provide adequate air to the enginesD.To cool the machinery areas
The following tells us how to reuse the used water.Which is the right order of the passage A.to have the used water filteredB.to put chemicals in itC.to pipe it to the usersD.to pipe the used water to be purified to a factory
单选题The cooling water jacket is common to all the cylinders but there are often （） to ensure that each cylinder receives the right amount and flow of water.Adividing wallsBdivided wallsCdividing linersDdivided jackets
单选题Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?（）ABaffle plates that have been bent during prior removalBLeaks in the cooler tube nestCOperating the engine while maintaining a high sea water outlet temperatureDA punctured sea water strainer supplying cooling water to the heat exchanger
单选题In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?（）AAn open vent in the cooling systemBA fouled sea chestCA restricted water passage in the engineDAir entrained in the cooling water
单选题The device allowing for the change in volume of the cooling water in a propulsion diesel engine closed cooling system is the （）.Afresh water expansion tankBsea water expansion tankCthermostatic expansion valveDjacket water cooler accumulator
单选题Why the cooling water of the diesel engine should be treated? Because the（）ACooling water is alkalescenceBcooling water is acidityCcooling water has salinityDcooling water has impurity
单选题Where is the cooling water from the compensating tank in the cooling water system of main engine lead to?（）Adischarge side of the centrifugal pumpBsuction side of the centrifugal pumpCthe lowest point of the cooling water systemDinlet of the main engine
单选题What is the fundamental purpose for imposing radio silence? （）ATo ensure that interference to proprietary communications is minimizedBTo ensure that only voice communications can be effected on the distress frequency or channelCTo ensure that a distressed vessel will have a window twice each hour for transmitting routine messagesDTo ensure that interference on a particular frequency or channel to communications concerning emergency traffic is minimized
单选题High diesel engine cooling water temperatures can be caused by （）.Aair in the cooling systemBan overhauled water pumpCcorrect amount of coolantDno air in the cooling system
单选题In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）Aimproper venting of the cooling systemBcarrying the expansion tank water level too highCa totally clogged impeller in the cooling water pumpDan incorrectly set cooling system temperature control
单选题Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to （）Amaintain low pH in the cooling waterBreduce the cooling water temperatureCincrease cooling water hardnessDform a protective film on metal surfaces
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Which of the following statements is correct concerning diesel engine cooling water systems?（）AEach engine must have its own engine driven cooling water pump capable of providing cooling for all ranges of operationBpropulsion engines with bores exceeding 200 mm are to be fitted with a means to display the cooling water temperature of each cylinderCAt least two independent sea suctions are to be provided for supplying water to the engine jackets or to the heat exchangersDSuitable strain are to be fitted between the circulating pumps and heat exchangers when sea water is used for direct cooling
单选题Temperature control valves installed in the jacket cooling water system of a diesel engine modulates the rate of water flow through the （）.Acooling water pumpBnozzle cooling passagesCcylinder jacketsDheat exchanger
单选题Which of the following statements is correct for the design and installation of diesel engine cooling water systems?（）AAn alarm device with audible and visible signals is required for all cooling water systemsBPropulsion engines with bores over 200 mm are to be fitted with cooling water jacketsCEach totally enclosed cooling system shall be provided with a suitable head tankDDrain cocks are to be provided at the lowest points of all cylinder water jackets
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
单选题It is necessary to remove （） from the cooling water spaces to improve heat transfer.AlimeBfrostCscaleDscar
单选题High diesel engine cooling water temperatures can be caused by （）.Aa worn water pumpBnot enough coolantCair in the cooling systemDall of the above