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单选题
The air supplied to the cylinders by a turbocharger is often reduced in volume by a/an （）
A
air compressor
B
diffuser
C
after-cooler
D
ventilator
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exhaust gas temperatureC
speedD
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vacuum pressureB
specific gravityC
heatD
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单选题In a turbocharger, inlet air velocity is increased in the（）.A
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compressor outlet voluteD
rotating impeller vanes
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单选题When used in conjunction with a turbocharger, the main function of an after-cooler is to （）A
increase the density of the cylinder air chargeB
prevent turbocharger overheatingC
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a failure of lubricatorC
a failure of cylinderD
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quantity of air it takes in and retains in the cylinders during a given time periodB
proportion of trapped air that is utilized in the combustion processC
thermodynamic efficiency of the engine cycleD
all of the above
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单选题Exhaust temperature increases in all cylinders, the possible cause may be（） (1) increased scavenging air temperature (2) air in fuel pumps and fuel valves (3) fouling of air and gas passagesA
(1)+(2)B
(1)+(3)C
(2)+(3)D
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单选题（）are supplied by main switchboard directly.A
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单选题The engine will fail to start unless （）.A
the pressure of the starting air is high enoughB
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all of the above
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单选题Cooling the intake air supplied to a diesel engine will （）.A
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decrease average compression pressureC
decrease air charge densityD
increase power output
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单选题Compressed air is supplied by air compression to （）.A
the air receiversB
the starting valvesC
the cylinder coversD
the distributors
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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（） in what position the engine stops there will always be at least one of the cylinders with its starting air valve open to admit compressed air to start the engine.A
BecauseB
Owing toC
ForD
No matter
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单选题The compressed air is supplied by （） to the air reservoirs.A
compressorsB
forced fansC
ventilatorsD
generators
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单选题The primary task of the compressed air system is to deliver the starting air necessary for （）A
starting the MEB
starting the emergency electric alternatorC
driving the main turbineD
driving the turbocharger
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单选题It is often necessary to put an engine into （） service with one or more cylinders cut out, or with a turbocharger secured.A
additionalB
permanentC
temporaryD
long
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单选题When the air charge contacts with the cylinders and pistons and mixes with the residual gases, it will（）A
increase in temperatureB
lose its energy partlyC
expand and do workD
begin to be compressed
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单选题Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger?（）A
Reduce engine speed to idle before removing the filterB
Soak the dirty filter in kerosene onlyC
Blow out the air inlet with compressed airD
Cover the air inlet after removing the filter
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单选题An operating turbocharged diesel engine that suddenly loses power, is due to a/an（）A
restricted turbocharger air intakeB
oil leak into the turbochargerC
dribbling injectorD
low fuel viscosity
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单选题The engine is started with （） supplied from air receivers.A
pressure oilB
pressure waterC
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单选题When the load is increased on a turbocharged diesel engine, the amount of increased air supplied by the turbocharger will（）A
lag behind the increased fuel supplied to the engineB
enter the engine along with the increase in the fuelC
enter the engine before the increased fuel supplyD
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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
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