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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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The space between cylinder liner and jacket is called _____.A.the cooling waterB.the circulating waterC.the coolerD.the cooling water space
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If air at 95°Cdry bulb temperature and 50%relative humidity is conditioned to 75°Cdry bulb temperature and 50%relative humidity, it is an example of()
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单选题If a diesel engine were running at 20% overload with a smoky exhaust, you should（）A
stop the engine immediately to prevent damageB
increase lube oil pressureC
slow the engine allowing it to gradually coolD
decrease the cooling water it temperature to the water jacket
考题
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
a dirty lube oil strainerB
internal water leaksC
an oil suction line restrictionD
excessive wears of the cooling water pump
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
around the engineB
around the coolerC
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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 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
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
Because the piston is exposed to very high temperature, it must be cooledB
The lower the piston cooling temperature is, the better it isC
Both water and lube oil can be used as coolantD
One of the piston cooling methods is vibration cooling, with better effect
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 pressureC
jacket water temperature must always be less than 60℃D
jacket water pressure must always be less than the sea water pressure
考题
单选题Which of the following statements is true concerning an oil cooler?（）A
The oil temperature is less than the cooling water temperatureB
The oil pressure is less than the cooling water pressureC
The oil pressure is greater than the cooling water pressureD
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考题
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
A room thermostat activates an electric heater at each individual chilled air outlet when necessaryB
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Varying the temperature of the water through the coilsD
Varying the quantity of water flowing through the coils
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
maintain the original fluid viscosityC
allow for changes in pressure and temperature within the systemD
assure constant fluid temperature
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
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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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