单选题In the closed cooling system, the water ().Ais made to circulate out of the systemBis made to circulate within the systemCis made circulate within the systemDis made circulate out of the system

单选题
In the closed cooling system, the water ().
A

is made to circulate out of the system

B

is made to circulate within the system

C

is made circulate within the system

D

is made circulate out of the system


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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

If the coolant temperature of a closed cooling water system for a diesel enginegradually increases, the trouble usually is( ).A.a broken shaft on the freshwater pumpB.an excessive accumulation of scale in the heat exchangerC.an incorrect thermostatic element operating rangeD.lube oil in the cooling water

In a diesel engine closed freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the __.A.suction pressure regulatorB.thermostatic bypass valveC.sea water temperatureD.water level in the expansion tank

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

Prolonged operation of a diesel engine with a closed cooling water system, at lower than normal designed operating temperatures can ______.A.increase power outputB.decrease lube oil viscosityC.eliminate fuel knockD.cause sulfuric acid formation

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

单选题If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is ()Aa broken shaft on the freshwater pumpBan excessive accumulation of scale exchangerCan incorrect thermostatic element operating rangeDlube oil in the cooling water

单选题What is head tank in the closed cooling water system used for?()Afor the release of air from the cooling waterBproviding expansion room for heated cooling waterCa place for implementing water and water treatment agentDall of the above

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In the closed cooling system, the water ().Ais made to circulate out of the systemBis made to circulate within the systemCis made circulate within the systemDis made circulate out of the system

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The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and ().Areduce water temperatureBreduce water turbulenceCprovide an air cushionDallow for an increase in water volume as the engine warms up

单选题The outlet from an expansion tank of a closed freshwater cooling system should be piped to the ().Acylinder head water outlet headerBcylinder jacket inlet mainCheat exchanger inlet connectionDjacket water pump suction line

单选题The highest pressure in any closed diesel engine freshwater cooling system is at the ().Ajacket water outletBexpansion tank inletCheat exchanger inletDcooling water pump outlet

单选题If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a ().Aloss of suction in the circulating pumpBleak in the primary cooling systemCbroken raw water pump shaftDburned or cracked piston in one cylinder

单选题Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?()ADefective temperature controls in the systemBCavitation in the cooling water pumpCOpened vent in the cooling systemDRestricted water passages in the engine

单选题In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the ().Asuction pressure regulatorBthermostatic bypass valveCsea water temperatureDwater level in the expansion tank

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Operating a diesel engine for prolonged periods, with a closed freshwater cooling system, at temperatures lower than the normal design temperature can cause ().Athe formation of sulfuric acidBa decrease in lube oil viscosityCa decrease in cooling water pHDa thermostat failure

单选题In any diesel engine closed freshwater cooling system, the lowest pressure exists at the ().Ajacket water outletBcooling water pump outletCheat exchanger outletDexpansion tank atmospheric vent

单选题In a diesel engine cooling water system, a pH of 60 indicates a/an ().Aslightly acidic conditionBslightly alkaline conditionCovertreatment of waterDneutral condition of water

单选题In the process of the stand-by, warm-up the engine usually through give preheat of which parts of the diesel engine?()Acooling water of the cooling systemBfuel of the FO systemCLO of the LO systemDcooling water of the cooling system and LO of the LO system

单选题If the compressor-discharge temperature is higher than the receiver temperature()Aincrease the amount of cooling water to the condenserBdecrease the amount of cooling water to the condenserCadd more refrigerant to the systemDremove some of the refrigerant from the system

单选题The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by ()Aregulating the level of corrosion inhibitor in the primary cooling systemBthe level of the freshwater expansion tankCvarying the engine load to meet temperature requirementsDthe operation of the thermostatic valve