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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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vacuum pressureB
specific gravityC
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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
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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
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单选题（）are supplied by main switchboard directly.A
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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
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单选题Compressed air is supplied by air compression to （）.A
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the starting valvesC
the cylinder coversD
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Faulty turbocharger turbine diffuser ringB
Faulty turbocharger compressor ringC
Insufficient cooling water flowD
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BecauseB
Owing toC
ForD
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compressorsB
forced fansC
ventilatorsD
generators
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driving the main turbineD
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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
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pressure oilB
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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
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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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