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Your vessel has a gasoline engine and a mechanical exhaust ventilation system．BEFORE starting the engine，the exhaust blower should be run long enough to ______．
A.warm up the exhaust blower motor
B.provide a proper supply of fresh air for the engine（s）
C.see the system is in good operating condition
D.insure at least one complete change of air in the compartments concerned
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更多 “ Your vessel has a gasoline engine and a mechanical exhaust ventilation system．BEFORE starting the engine，the exhaust blower should be run long enough to ______．A.warm up the exhaust blower motorB.provide a proper supply of fresh air for the engine（s）C.see the system is in good operating conditionD.insure at least one complete change of air in the compartments concerned ” 相关考题
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A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the same displacement because the _____. ① MEP is lower and the scavenging air is cooling the exhaust gases ② valve overlap in a four strokeA.①B.②C.① and ②D.Neither ① nor ② is correct
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In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with ______.A.low firing pressureB.low exhaust temperatureC.mechanical knock in each cylinderD.fuel knock in each cylinder
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Before starting any diesel or gasoline engine, which of the following must be checked?____.A.Oil levelB.Flow of cooling waterC.Exhaust dischargeD.All of the above
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单选题In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.A
downwards；upwardsB
upwards；downwardsC
downwards；downwardsD
upwards；upwards
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单选题In a diesel engine, a positive displacement type blower is usually （）A
gear drive by the engineB
driven by an exhaust gas turbineC
driven by a camshaftD
driven by separate motor
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单选题When one cylinder has a lower compression pressure and higher exhaust gas temperature than any of the other engine cylinders, which of the conditions listed will indicated?（）A
Advanced ignitionB
Clogged air intakeC
Leaky exhaust valveD
High exhaust pressure
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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The satisfactory operation of diesel engine exhaust valves usually depends on（）A
the proper back pressureB
the cooling water temperatureC
correct timing and proper seatingD
accurate metering and the exhaust temperature
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单选题Forcing the exhaust gases form the cylinder of an operating diesel engine with the aid of a blower is known as （）A
scavengingB
forced draftC
turbo-chargingD
aspiration
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单选题The exhaust gases for a new engine should be （） when the engine operates under full load.A
smokyB
a little bit denseC
visibleD
almost invisible
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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Gas exchange, which is a basic part of the cycle of an internal combustion engine, is（）A
the supply of normal air and removal of compressed airB
the supply of fuel oil and combustion of the atomized oilC
the supply of fresh air and removal of exhaust gasesD
the supply of fresh air and removal of the extra heat
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单选题A large two-stroke/cycle direct reversing diesel engine is to be reversedPrior to the admission of starting air you must （）A
line up the engine fore restarting with light diesel oilB
reposition the fuel injection camC
change the intake and exhaust valve cam positionsD
place the starting cam in the intermediate position
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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
operates with scavenge air under a positive pressureD
operates without energy absorbing intake and exhaust strokes
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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When an engine is starting and has got a sufficiently high speed, say about 20 rpm,（）A
the starting air supply is cut off and fuel is injected into the cylindersB
the fuel feeding is cut off and the turning gear is put inC
the starting air supply is cut off and turning gear is taken outD
the electric blower is shut down and fuel is injected into the cylinders
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单选题An indication of a diesel engine air intake being partially clogged, is （）.A
low firing pressure and low exhaust temperaturesB
low firing pressure and normal exhaust temperaturesC
high firing pressure and low exhaust temperaturesD
high firing pressure and high exhaust temperatures
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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 two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longerA
(1) onlyB
(2) onlyC
both (1) and (2)D
neither (1) nor (2)
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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The mechanical exhaust valve operation system is replaced by（）in an electronic controlled ME engine.A
a system with a Hydraulic Power Supply (HPS) unitB
a system with roller guides for exhaust valvesC
a system with an electronically controlled Alpha LubricatorD
a system directly powered by electric motor
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单选题A fuel line breaks，sprays fuel on the hot exhaust manifold，and catches fire. Your FIRST action should be to（）.A
batten down the engine roomB
start the fire pumpC
apply carbon dioxide to the fireD
shut off the fuel supply
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