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单选题
To minimize the formation of carbon deposits on fuel injection nozzles, you should （）
A
avoid using liquid-cooled nozzles whenever possible
B
avoid low cooling water temperatures
C
avoid prolonged overloading of the engine
D
make certain the gasket seal between the nozzle and cylinder head is tight
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更多 “单选题To minimize the formation of carbon deposits on fuel injection nozzles, you should （）A avoid using liquid-cooled nozzles whenever possibleB avoid low cooling water temperaturesC avoid prolonged overloading of the engineD make certain the gasket seal between the nozzle and cylinder head is tight” 相关考题
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corrosion and gumming of the fuel injection pumpC
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单选题The carbon deposits on the piston crown and in the ring grooves （）.A
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higherC
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fuel dribbling from leaking fuel injectorsB
burning fuel with a high carbon contentC
burning fuel with a high vanadium contentD
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单选题Heat damage to fuel injection nozzles can be prevented by avoiding （）A
excessive fuel oil temperatureB
long periods of engine overloadC
metallic contact between nozzles and cylinder headsD
hard carbon deposit and varnish on the nozzles
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单选题High exhaust back pressure will result in an increase in （）A
turbocharger efficiencyB
engine power outputC
carbon deposits on fuel injectorsD
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单选题Which of the following characteristic of lube oil helps to reduce the amount of deposits in the piston ring belt during the combustion process in a diesel engine?（）A
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Low carbon forming tendenciesC
High film strengthD
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单选题A diesel engine should not be operated at low loads for long periods of time because（）A
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fuel dilution is increased at low loadC
exhaust valves may be damagedD
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The cost of carbon emission permits is driven down.B
Trade for carbon market failed.C
Greenhouse gases are the most important guideline of ecology.D
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ignition quality of the fuelB
high heating value of the fuelC
amount of carbon residue after combustionD
internal flow resistance in the injectors
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单选题Sludge formation in a diesel engine lube oil system is caused by（）A
carbonization of oils from the combustion chambersB
emulsions of lube oil and waterC
coagulation of unburned fuel below the piston ringsD
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考题
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induce carbon formation on cylinder wallsB
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form a friction reducing film between mating surfacesD
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考题
单选题If due to thick and hard deposits of carbon, the piston rings cannot move freely in their grooves, dark areas will often appear on the upper part of the cylinder wall (may not be the risible at port inspection)What condition of the piston rings can result in this phenomenon?（）A
micro-seizureB
stickingC
scratchedD
breakage/ollapse
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单选题Which of the following conditions would cause carbon deposits to form in the piston ring belt of a diesel engine?（）A
faulty combustionB
excessive ring temperatureC
over lubricationD
all of the above
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