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单选题
The exhaust system for a turbocharged diesel engine functions to （）
A
power the after-coolers
B
power the turbocharger
C
reduce the cylinder scavenge effect
D
cool the turbocharger
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increase the density of the intake airB
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单选题Diesel engine mufflers or silencers reduce the engine exhaust noise by （）A
passing the exhaust through long head pipesB
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no effect of engine mounting boltsD
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testing for the mechanical load and the thermal loadB
inspecting thermal and mechanical condition of the engineC
inspecting each system and exhaust temperatureD
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单选题The exhaust system of a diesel engine is usually designed to remove exhaust gases and to （）A
provide exhaust back pressureB
prevent exhaust smoke emissionsC
power a reciprocating superchargerD
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单选题Burning fuel with a high sulfur content in a diesel engine will （）A
increase thermal efficiencyB
cause clogging of the fuel systemC
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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
reduce engine room noiseD
all of the above
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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
greater at reduced engine speed
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单选题High firing pressures and a low exhaust temperature in a diesel engine may result from （）.A
decreased piston to cylinder head clearanceB
increased exhaust system back pressureC
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单选题In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in （）A
increased engine back pressureB
sulfuric acid corrosionC
surface pitting of the turbochargerD
moisture impingement on the turbocharger compressor blade
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单选题A turbocharged diesel engine will have an intake manifold pressure（）A
constantly decreasing as engine load increaseB
constantly increasing as the amount of supercharging increasesC
approximately equal to exhaust manifold pressure at all timesD
approximately equal to atmospheric pressure at all times
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单选题Clearance volume 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Diesel engine valve springs function to （）A
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keep the valves off their seats until the exhaust stroke is completedC
close the valvesD
open inlet valves when the air injection cycle begins
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单选题An automated diesel engine should normally shut down due to （）A
low lube oil temperatureB
high ambient air temperatureC
low tube oil pressureD
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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
temperature of the exhaust gasesB
energy supplied to the turbochargerC
air pressure to the intake manifoldD
purge of exhausted gases from the cylinders
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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What is the function of the after-cooler installed in the diesel engine air intakes system?（）A
Decrease the air densityB
Increase the exhaust temperatureC
Decrease the lube oil temperatureD
Increase the air density
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单选题“This increase in charge air density is accomplished on most modern diesel engine types by use of exhaust gas turbo-charging, in which a turbine wheel driven by exhaust from the engine is rigidly coupled to a centrifugal type air compressor” According to this sentence, we can know that increases density（）, drives the compressor directly（）A
a modern diesel engine；a turbine wheelB
a modem diesel engine；exhaust gasesC
a compressor；an exhaust gas turbochargerD
a compressor；a turbine wheel
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单选题In a turbocharged four-stroke/cycle diesel engine, the exhaust valve remains open until after top dead center and the intake valve opens before top dead center to（）.A
produce a scavenging effect in the combustion spaceB
equalize cylinder and exhaust manifold pressuresC
alleviate the difference in valve size between the intake and exhaustD
flush out condensate that collects after each compression stroke
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