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单选题
In a diesel engine cooling water system, a pH of 60 indicates a/an （）.
A
slightly acidic condition
B
slightly alkaline condition
C
overtreatment of water
D
neutral condition of water
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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
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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
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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
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单选题If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）A
a broken shaft on the freshwater pumpB
an excessive accumulation of scale exchangerC
an incorrect thermostatic element operating rangeD
lube oil in the cooling water
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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
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单选题The pH value of water in a diesel engine closed cooling water system should be maintained between （）.A
60 to75B
80 to 95C
100 to 115D
120 to 135
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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
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单选题One of the purposes for water cooling the exhaust manifold in marine diesel engine is to （）A
reduce lube oil temperatureB
raise exhaust temperature reduceC
excessive heating of engine roomD
reduce load on cooling water pump
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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
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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
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单选题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
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单选题In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）A
improper venting of the cooling systemB
carrying the expansion tank water level too highC
a totally clogged impeller in the cooling water pumpD
an incorrectly set cooling system temperature control
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单选题The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.A
reduce water temperatureB
reduce water turbulenceC
provide an air cushionD
allow for an increase in water volume as the engine warms up
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单选题Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to （）A
maintain low pH in the cooling waterB
reduce the cooling water temperatureC
increase cooling water hardnessD
form a protective film on metal surfaces
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单选题The highest pressure in any closed diesel engine freshwater cooling system is at the （）.A
jacket water outletB
expansion tank inletC
heat exchanger inletD
cooling water pump outlet
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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
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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 （）.A
loss of suction in the circulating pumpB
leak in the primary cooling systemC
broken raw water pump shaftD
burned or cracked piston in one cylinder
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单选题Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）A
Defective temperature controls in the systemB
Cavitation in the cooling water pumpC
Opened vent in the cooling systemD
Restricted water passages in the engine
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
考题
单选题A diesel engine cooling water system with a pH factor of 30 indicates a condition of （）.A
slight acidityB
slight alkalinityC
excessive alkalinityD
excessive acidity
考题
单选题Which of the following statements is correct for the design and installation of diesel engine cooling water systems?（）A
An alarm device with audible and visible signals is required for all cooling water systemsB
Propulsion engines with bores over 200 mm are to be fitted with cooling water jacketsC
Each totally enclosed cooling system shall be provided with a suitable head tankD
Drain cocks are to be provided at the lowest points of all cylinder water jackets
考题
单选题In any diesel engine closed freshwater cooling system, the lowest pressure exists at the （）.A
jacket water outletB
cooling water pump outletC
heat exchanger outletD
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考题
单选题There is （） in any water cooling system for a diesel engine allowing for expansion and water make-up in the system as well as air vent and chemicals addition.A
a setting tankB
a service tankC
a head tankD
an expansion joint
考题
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?（）A
cooling water of the cooling systemB
fuel of the FO systemC
LO of the LO systemD
cooling water of the cooling system and LO of the LO system
考题
单选题High diesel engine cooling water temperatures can be caused by （）.A
a worn water pumpB
not enough coolantC
air in the cooling systemD
all of the above
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
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