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单选题
Performance of a turbocharged engine can be improved by（）
A
decreasing the amount of valve overlap
B
preheating the air intake
C
after-cooling the intake air
D
preheating light fuel
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单选题The exhaust system for a turbocharged two-stroke/cycle diesel engine functions to（）A
discharge exhaust gases and smokeB
furnish energy to the turbochargerC
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单选题High exhaust temperatures from all of cylinder of a turbocharged, four-stroke/cycle diesel engine can be caused by an（）A
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overload on one cylinderD
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单选题In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）A
improper venting of the cooling systemB
carrying the expansion tank water level too highC
a totally clogged impeller in the cooling water pumpD
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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
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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
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单选题An increase in the load on a turbocharged diesel engine operating at constant speed will result in an increase in （）A
exhaustB
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brake main effective pressureD
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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A sudden power loss from a turbocharged and after-cooled diesel engine is an indication of a/an（）A
turbocharger malfunction or failureB
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excessive fuel consumptionC
loss of powerD
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单选题If the speed of a turbocharged diesel engine is maintained constant the turbocharger speed will （）A
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increase as the load increasesC
decrease as the loadD
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单选题In a main propulsion turbocharged diesel engine, the speed of the turbocharger varies according to the （）A
governor droopB
speeder spring tensionC
fuel rack lagD
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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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考题
单选题A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the （）.A
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energy supplied to the turbochargerC
air pressure to the intake manifoldD
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单选题Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished（）A
during the valve overlap periodB
with only the exhaust valve openC
at a pressure below atmosphericD
without cooling the cylinders or pistons
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单选题One of the differences between a two-stroke engine and a four-stroke engine is,（）A
a two-stroke engine can’t work without cylindersB
a two-stroke engine can’t work without pistonsC
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a two-stroke engine can’t work without a blower
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