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单选题
Intake air flow from a diesel engine turbocharger is directly proportional to engine（）
A
exhaust gas pressure
B
exhaust gas temperature
C
speed
D
load
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单选题Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）A
natural aspirationB
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单选题The function of the after-cooler installed between the turbocharger and intake manifold on some diesel engine, is to （）A
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单选题Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）A
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单选题White smoke issuing from the exhaust of an auxiliary diesel engine valve opening （）A
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单选题What is the best way of stopping an over-speeding diesel engine?（）A
Disconnect the battery cables from the starting motorB
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单选题Poor combustion in a diesel engine can be caused by （）.A
high compression pressureB
low intake air temperatureC
low exhaust pressureD
high scavenge air temperature
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单选题Diesel engine starting difficulties due to cold intake air temperatures, can be overcome by using a/an（）A
increase in starting air pressureB
increase in lube oil viscosityC
compression expansion deviceD
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单选题During the valve overlap period, the exhaust pressure of a turbochargers, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure （）A
effective cylinder scavenging and coolingB
constant pressure from the turbochargersC
cooler operation of the exhaust systemD
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单选题Cooling the intake air supplied to a diesel engine will （）.A
reduce mean effective pressureB
decrease average compression pressureC
decrease air charge densityD
increase power output
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单选题What is the effect of heated intake air on a diesel engine? （）A
Increases efficiencyB
Increases engine horsepowerC
Increases engine lifeD
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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A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）A
has little or no internal frictionB
has a lower effective compression ratioC
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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
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Blow out the air inlet with compressed airD
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kilowatt loadC
fuel injection pressureD
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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
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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 process of scavenging a two-stroke/cycle diesel engine serves to（）A
improve fuel flow volumeB
cool the exhaust valvesC
reduce the intake air charge densityD
increase the temperature of exhaust gases
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单选题A restricted air intake to a diesel engine may result in the engine （）.A
failing to reach rated speedB
knocking under maximum loadC
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单选题In a naturally aspirated diesel engine, the volume of air intake is directly related to engine （）.A
compression ratioB
valve sizeC
fuel pressureD
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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
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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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单选题Which of the factors listed has the greatest effect on the mechanical efficiency of a diesel engine?（）A
temperature of the intake airB
friction within the engineC
mechanical condition of the superchargerD
mechanical condition of the turbocharger
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