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单选题
If the turbocharger failed on an auxiliary diesel engine, which of the following conditions would probably occur?（）
A
Full power cannot be developed
B
The exhaust will contain black smoke
C
Complete combustion will be impossible
D
All of the above
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Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?A.Leaking seal ringB.Insufficient heat transfer from the exhaust valvesC.Blocked cooling water passages to the headD.Excessive scavenging air provided to the engine
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Engine operating conditions may be indicated by the color of the exhaust smoke Black smoke could indicate .A.an insufficient speed droop settingB.an overloaded engineC.clogged drain holes in the oil control ringsD.complete combustion
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A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler ______.A.corrosion at low engine loadsB.erosion at high engine loadsC.overload at high engine loadsD.scaling at all exhaust temperatures
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What would white exhaust smoke from a diesel engine probably mean ________．A.Late fuel injectionB.Excess combustion airC.Dribbling injector tipsD.Excessive lube oil consumption
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Before starting any diesel or gasoline engine, which of the following must be checked?____.A.Oil levelB.Flow of cooling waterC.Exhaust dischargeD.All of the above
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单选题Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?（）A
Leaking seal ringB
Insufficient heat transfer from the exhaust valvesC
Block cooling water passages to the headD
Excessive scavenging air provided to the engine
考题
单选题White smoke issuing from the exhaust of an auxiliary diesel engine valve opening （）A
the engine is overloadedB
the engine is coldC
there is too much lube oil in the cylindersD
the turbocharger is fouled
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单选题Which of the following problems represent one possible cause of high lube oil consumption in a four stroke diesel engine?（）A
Worn intake valve guidesB
Pitted pre-combustion chambersC
Loose valve tappetsD
High exhaust back pressure
考题
单选题Following the failure of one turbocharger on a large, crosshead, main propulsion diesel engine, fitted with multiple turbochargers, which of the following actions should be taken prior to further operation of the engine? （）A
Blank off the exhaust gas inlet to the damaged turbochargerB
Secure cooling and lubrication to the damaged turbochargerC
Lock the rotor of the damaged turbochargerD
All of the above
考题
单选题The function of the after-cooler installed between the turbocharger and intake manifold on some diesel engine, is to （）A
increase the density of the intake airB
decrease turbocharger power usageC
reduce exhaust gas temperatureD
compensate for turbocharger PRM fluctuations
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单选题When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?（）A
During operation at low speedB
During operation at rated speed, but low power outputC
During accelerationD
All of the above
考题
单选题Which of the following operational conditions will occur to the diesel engine lube oil at extremely high temperature?（）A
The oil oxidizes and forms carbon depositsB
The viscosity increasesC
Engine oil consumption decreasesD
Lubricating qualities of the oil are enhanced
考题
单选题Which of the following conditions may be attributed to a fouled turbocharger compressor inlet screen or filter?（）A
Decreasing scavenge air pressureB
Increasing exhaust temperatures before the turbineC
Reduction in engine speedD
All of the above
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单选题Which of the listed conditions will occur if a diesel engine exhaust valve is leaking?（）A
Loss of compression for that cylinderB
Misfiring or rough runningC
Damage to the valveD
All of the above
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单选题Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle turbo-charged diesel engine?（）A
Clogged air intake faltersB
Piston blow-byC
A defective after-coolerD
Faulty exhaust valves
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单选题Which of the following problems can cause an above normal air temperature to develop in the intake manifold of a turbocharged and after-cooled diesel engine?（）A
Faulty turbocharger turbine diffuser ringB
Faulty turbocharger compressor ringC
Insufficient cooling water flowD
Clogged air intake filters
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单选题Which of the following conditions may contribute to the formation of deposits on the blades of the turbocharger turbine?（）A
Poor combustionB
High cylinder oil consumptionC
Leaking exhaust valvesD
All of the above
考题
单选题If an auxiliary diesel engine temperature is higher than normal ,but the thermostat is determined not to be defective you would suspect a /an （）A
cavitation erosion in the water jacketsB
excess corrosion inhibitor in the coolantC
dirty jacket water coolerD
defective turbocharger
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单选题Which of the following operating procedures should be carried out immediately after any diesel engine is started?（）A
Take all exhaust temperature readingB
Check the sump oil levelC
Verify proper lube oil pressureD
All of the above
考题
单选题The PRIMARY function of a waste heat boiler is to （）.A
reduce engine exhaust noiseB
reduce engine back pressureC
recover heat which otherwise would be lostD
increase turbocharger efficiency
考题
单选题The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）A
Low compression pressure and high exhaust temperatureB
Low firing pressure and high exhaust temperatureC
Low compression pressure and low exhaust temperatureD
Low firing pressure and low exhaust temperature
考题
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
考题
单选题Which of the following conditions could be a cause of excessive fuel dilution of diesel engine lube oil?（）A
Leaking fuel injectorsB
Lower than normal compressionC
Delayed fuel injectionD
All of the above are correct
考题
单选题High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by （）.A
engine overloadB
low combustion temperatureC
plugged fuel nozzle holesD
excessive compression pressure
考题
单选题If you observe smoke coming from the turbocharger of an auxiliary diesel engine, you should（）A
check the air filter for obstructionB
check for an exhaust leakC
check the exhaust temperatureD
secure the engine
考题
单选题Why will a turbocharger diesel engine produce black smoke if excessive additional load is applied too quickly?（）A
Exhaust energy would draw excess airB
The inertia of the turbocharger rotor causes a time lag which delays the turbocharger speed increaseC
Exhaust gas pumping losses are increased due to turbine windageD
Exhaust gas back pressure falls slightly due to increased nozzle action
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
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