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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 pump
B
nozzle cooling passages
C
cylinder jackets
D
heat exchanger
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单选题If a diesel engine were running at 20% overload with a smoky exhaust, you should（）A
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单选题If the cooling water temperature and the lube oil temperature in a diesel engine are too high, the cause can be （）A
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考题
单选题A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water （）.A
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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
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excessively high coolant pressureC
improper temperaturesD
malfunctioning of the jacket water heater
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 satisfactory operation of diesel engine exhaust valves usually depends on（）A
the proper back pressureB
the cooling water temperatureC
correct timing and proper seatingD
accurate metering and the exhaust temperature
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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
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a jammed three-way thermostatic valveC
chromate PH too lowD
a high level in the surge tank
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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
考题
单选题As to the piston cooling, of the following, which statement is not true?（）A
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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
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单选题In a diesel engine jacket water cooler, with seawater cooling the fresh water, the（）A
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单选题Which of the following statements is true concerning an oil cooler?（）A
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单选题Which of the following methods is normally used to control the temperature of air distributed from individual cooling coils in an air conditioning system using a chilled water circulation system?（）A
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考题
单选题Compensated flow control or constant flow valves are used in hydraulic systems to（）A
compensate for major leaks in the systemB
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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
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考题
单选题Reheating a hardening component to a temperature lower than the hardening temperature and then cooling it is known as （）A
low temperature hardeningB
case hardeningC
annealingD
tempering
考题
单选题Which of the following conditions will develop if the flow of ‘raw’ cooling water to diesel engine is obstructed?（）A
Air will enter the cooling systemB
Carbon will plug the water cooled exhaust manifoldsC
The jacket water temperature will riseD
The lube oil viscosity will increase
考题
单选题If the compressor-discharge temperature is higher than the receiver temperature（）A
increase the amount of cooling water to the condenserB
decrease the amount of cooling water to the condenserC
add more refrigerant to the systemD
remove some of the refrigerant from the system
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
考题
单选题Piston cooling fins are located（）A
atop the piston crownB
beneath the piston crownC
at the base of the piston skirtD
inside the cylinder liner cooling water jacket
考题
单选题Control valves of a CO2 system may be located within the protected space when（）.A
it is impractical to locate them outsideB
there is also a control valve outsideC
the CO2 cylinders are also in the spaceD
an automatic heat-sensing trip is installed
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