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单选题
The color of the exhaust from a diesel engine should be （）
A
clear
B
hazy light brown
C
hazy light blue
D
hazy light grey
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A water jacket is placed around the exhaust manifolds of propulsion diesel enginesto( ).A.reduce heat radiation to the engine roomB.aid in preventing turbocharger overheatingC.condense and drain moisture from exhaust gasesD.dampen exhaust gas pulsations in the manifold
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A dry-type spark arrestor removes sparks from a diesel engine exhaust by ____.A.increasing the linear velocity of the exhaust gasesB.changing directions of exhaust gas flowC.decreasing the temperature of the exhaust gasesD.accelerating the exhaust gas through a reduced size orifice
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Immediately after any diesel engine is started, the engineer should check the ______.A.crankcase pressureB.lube oil pressureC.saltwater pressureD.exhaust temperature
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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
masked intake valvesC
air cellsD
scavenging air
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单选题If a diesel engine were running at 20% overload with a smoky exhaust, you should（）A
stop the engine immediately to prevent damageB
increase lube oil pressureC
slow the engine allowing it to gradually coolD
decrease the cooling water it temperature to the water jacket
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单选题A water jacket is placed around the exhaust manifolds of propulsion diesel engines to（）A
reduce heat radiation to the engine roomB
aid in preventing turbocharger overheatingC
condense and drain moisture from exhaust gasesD
dampen exhaust gas pulsations in the manifold
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单选题White smoke issuing from the exhaust of an auxiliary diesel engine valve opening （）A
the engine is overloadedB
the engine is coldC
there is too much lube oil in the cylindersD
the turbocharger is fouled
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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
diffusing exhaust vibrations through activated carbon bafflesC
increasing the exhaust gas velocityD
reducing the exhaust gas velocity
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单选题Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?（）A
Leaking seal ringB
Insufficient heat transfer from the exhaust valvesC
Block cooling water passages to the headD
Excessive scavenging air provided to the engine
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单选题White smoke exhausting from a diesel engine can result from （）A
high exhaust temperatureB
high lube oil temperatureC
low turbo-charger speedD
low cooling water temperature
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单选题Clogged or partially obstructed exhaust ports on a diesel engine can cause（）A
over-speeding of the engineB
failure of the engine to shut downC
no effect of engine mounting boltsD
high exhaust temperatures
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单选题A dark exhaust from a running diesel engine can be caused by （）A
late ignitionB
water in the fuelC
high compression temperatureD
starting valve stuck open
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单选题The exhaust gases in a supercharged two-stroke/cycle diesel engine are expelled from the cylinder by （）A
pumping action of the pistonB
pressure of the fuel chargeC
vacuum developed in the manifoldD
pressure of the fresh air charge
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单选题Which of the following gases represents the greatest threat to personnel safety in an engine room where the exhaust is leaking from a diesel engine?（）A
Carbon dioxideB
Carbon monoxideC
Carbon trioxideD
Hydrogen sulfide
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单选题A smoking exhaust from an operating diesel engine could be caused by （）A
low sulfur content in the fuelB
a loose injector inlet connectionC
late fuel injectionD
high injection pressure
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单选题High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by （）.A
engine overloadB
low combustion temperatureC
plugged fuel nozzle holesD
excessive compression pressure
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单选题What color exhaust will be exhibited when a slow speed two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?（）A
WhiteB
BlackC
BlueD
Clear
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单选题To successfully reduce an excessively high diesel engine exhaust gas temperature, you should （）.A
reduce the engine driven fuel pump outlet pressureB
retard the fuel injector timing to reduce powerC
increase the fuel rack settingD
reduce the load on the engine
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单选题"Scavenging" on a diesel engine means （）.A
injecting fuel oil into a cylinderB
removing exhaust gases from the cylinderC
forcing air into the cylinders under pressure after the exhaust valve has dosedD
a combination of all the above
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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
early fuel injection timingD
low scavenge air temperature
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单选题A dry-type spark arrestor removes sparks from a diesel engine exhaust by（）A
increasing the linear velocity of the exhaust gasesB
changing directions of exhaust gas flowC
decreasing the temperature of the exhaust gasesD
accelerating the exhaust gas through a reduced size orifice
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单选题In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the（）A
exhaust manifoldB
valve bridgeC
pressure of the fresh air chargeD
valve adjusting gear
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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
high exhaust system back pressure
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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A diesel engine is operating with excessively high exhaust temperatures at all cylindersTo correct this condition, you should FIRST （）.A
reduce the engine loadB
increase the cooling water flowC
increase the lube oil pressureD
adjust the fuel rack
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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
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air pressure to the intake manifoldD
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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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