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单选题
In a diesel engine jacket water cooler, with seawater cooling the fresh water, the()
A

sea water temperature must never be warmer than 40℃

B

jacket water pressure should always be greater than the sea water pressure

C

jacket water temperature must always be less than 60℃

D

jacket water pressure must always be less than the sea water pressure


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考题 If an auxiliary diesel engine coolant temperature is higher than normal, but the thermostat is determined not to be defective, you would suspect a/anA.cavitation erosion in the water jacketsB.excess corrosion inhibitor in the coolantC.dirty jacket water coolerD.defective turbocharger

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考题 The main propulsion diesel engine jacket water temperature rises above normal, with the raw sea suction and the expansion tank water level being normal. Which of the following problems is most likely the cause?A.Faulty thermostatic bypass valveB.Eroded zinc pencils in the heat exchangerC.Steam formation in the expansion tankD.Excessive leakage from jacket water pump seals

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考题 单选题Lube oil accumulating in the cooling water system of a diesel engine will result in ()A lube cooler failureB poor heat transferC mechanical lubricator failureD camshaft seizure

考题 单选题Stating a large propulsion diesel engine using diesel fuel during cold weather conditions can be made easier by ()A increasing the quantity of starting airB increasing the lube oil pressureC heating the engine fuel supplyD heating the engine jacket water

考题 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?()A Baffle plates that have been bent during prior removalB Leaks in 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

考题 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 ().A fresh water expansion tankB sea water expansion tankC thermostatic expansion valveD jacket water cooler accumulator

考题 单选题Diesel engine jacket water is used in the distillation process as the ().A coolant for the distillateB coolant for the brine coolerC means of heating the feedwaterD primary means of producing a vacuum within the distiller

考题 单选题Which of the diesel engine cylinder liners listed has internal cooling water passages?()A Internally finned linerB Externally finned linerC Wet linerD Integral water-jacket liner

考题 单选题If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in ()A a low level in the engine expansion tankB excessively high coolant pressureC improper temperaturesD malfunctioning of the jacket water heater

考题 单选题If the jacket water temperature of an operating diesel engine suddenly rises above normal, the cause can be attributed to ().A an overfilled expansion tankB excess chromate treatment of the jacket waterC a clogged raw water sea suctionD cavitation erosion of the heat exchanger tubes

考题 单选题If the jacket water temperature in an auxiliary diesel engine cooling system is lower than normal, the probable cause is ()A air binding of the engine cooling systemB a cracked water cooled exhaust manifoldC blockage in the heat exchangerD faulty operation of the thermostat

考题 单选题In order to maintain a constant outlet water temperature of 80-85℃ from the engine, a three-way valve is installed()A at the jacket cooler outlet to control the flux through the engineB at the jacket cooler outlet to control the flux through the coolerC at the engine outlet to control the flux through the engineD at the engine inlet to control the flux through the engine

考题 单选题The main propulsion diesel engine jacket water temperature rises above normal, with the raw water sea suction and the expansion tank water level being normalWhich of the following problems is most likely the cause?()A Faulty thermostatic bypass valveB Eroded zinc pencils in the heat exchangerC Steam formation in the expansion tankD Excessive leakage from jacket water pump seal

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考题 单选题Immediately after starting a diesel engine, normal raw water and jacket water pressure are indicatedHowever, the jacket water temperature continues to rise, if there is no change in the sea temperature, you should suspect()A overloading in all cylindersB a jammed three-way thermostatic valveC chromate PH too lowD a high level in the surge tank

考题 单选题What condition will result in the automatic shutdown of a diesel engine? ()A High jacket water pressureB High lube oil pressureC Low lube oil pressureD Excessive turbo charger speed

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考题 单选题Cold weather starting of a diesel engine may be made easier by()A decreasing the compression ratioB using a special fuel having a high ignition temperatureC increasing the starting air supplyD heating the jacket water

考题 单选题In a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the ()A raw water pump dischargeB expansion tank outletC cooling water heat exchangerD outlet engine jacket water outlet

考题 单选题If an auxiliary diesel engine temperature is higher than normal ,but the thermostat is determined not to be defective you would suspect a /an ()A cavitation erosion in the water jacketsB excess corrosion inhibitor in the coolantC dirty jacket water coolerD defective turbocharger

考题 单选题Lube oil in the fresh water cooling system of a diesel engine may result from a ()A camshaft seizureB lube oil pump failureC lube oil cooler failureD lube oil pump overflow

考题 单选题If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST ()A place standby cooler in operationB reduce engine loadC check thermostatic valveD clean sea water strainer

考题 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 ().A cooling water pumpB nozzle cooling passagesC cylinder jacketsD heat exchanger

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考题 单选题The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by ()A regulating the level of corrosion inhibitor in the primary cooling systemB the level of the freshwater expansion tankC varying the engine load to meet temperature requirementsD the operation of the thermostatic valve