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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 temperature
B
raise exhaust temperature reduce
C
excessive heating of engine room
D
reduce load on cooling water pump
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The purpose of treating the cooling water of the diesel engine is to______. I、 resist the scale formation in the cooling chamber II、lubricate the engine part II III、increase thermal capacity IV、 resist corrosionA.I + IIB.II + IIIC.III + IVD.I + IV
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The relative air pressure in the inlet manifold of a turbocharged diesel engine is usually______.A.greater than the average exhaust manifold pressureB.less than the average exhaust manifold pressureC.greater at the turbine wheel than at the impellerD.greater at reduced engine speed
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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
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单选题Auxiliary diesel engines can be automatically shut down as a result of （）A
low lube oil temperatureB
low lube oil pressureC
high exhaust temperatureD
high cooling water pressure
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单选题In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?（）A
An open vent in the cooling systemB
A fouled sea chestC
A restricted water passage in the engineD
Air entrained in the cooling water
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单选题The operating diesel generators will have their exhaust temperatures, cooling water and lubricating oil temperatures and pressures （） in much the same way as for the main engine.A
to be keptB
loggedC
changedD
has remained
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单选题One characteristic of a pulse type turbo-charging system is（）A
high average exhaust manifoldB
greatly fluctuating inlet manifold pressureC
constant exhaust manifold pressureD
multiple exhaust pipes to the turbocharger
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单选题A water jacket is placed around the exhaust manifolds of propulsion diesel engines to（）A
reduce heat radiation to the engine roomB
aid in preventing turbocharger overheatingC
condense and drain moisture from exhaust gasesD
dampen exhaust gas pulsations in the manifold
考题
单选题For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）A
the temperature and flow quantity of the exhaust gas from M.EB
the quantity of steam demandedC
the rotary speed and the cooling water temperature of main engineD
efficiency of M.E turbocharger
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单选题While maneuvering, you discover heavy smoke coming from the turbocharger casing, you should （）A
check the air filter for dirtB
check for an exhaust leakC
check the cooling water temperatureD
notify the bridge that you are going to shut the engine down
考题
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
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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Low cylinder compression pressure and a high exhaust temperature may indicate （）A
early fuel injection timingB
leaking valvesC
a continuously open scavenge air portD
low cooling water temperature
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单选题The relative air pressure in the inlet manifold of a turbocharged diesel engine is usually（）A
greater than the average exhaust manifold pressureB
less than the average exhaust manifold pressureC
greater at the turbine wheel than at the impellerD
greater at reduced engine speed
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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 conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?（）A
Excessive piston blow-by to the manifoldB
Insufficient cooling water flowC
Accumulated water in the air boxesD
Clogged air intake filters
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单选题Which of the following statements is correct regarding a turbocharged four-stroke/cycle diesel generator?（）A
At zero load the intake manifold pressure is greater than the exhaust manifold pressureB
At full load the intake manifold pressure and exhaust manifold pressure are equalC
At full load the intake manifold pressure is less than the exhaust manifold pressureD
At full load the intake manifold pressure is greater than the exhaust manifold pressure
考题
单选题Fresh water is used for the cooling of cylinder jackets and （） of the marine diesel engine.A
cylinder coversB
lubricating spaceC
crossheadD
exhaust manifold
考题
单选题A diesel engine is operating with excessively high exhaust temperatures at all cylindersTo correct this condition, you should FIRST （）.A
reduce the engine loadB
increase the cooling water flowC
increase the lube oil pressureD
adjust the fuel rack
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For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）A
the temperature and flow quantity of the exhaust gas from M/EB
the quantity of steam demandedC
the rotary speed and the cooling water temperature of main engineD
efficiency of M/ turbocharger
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