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单选题
The minimum fuel oil delivery pressure required for diesel engine injection depends primarily on the（）
A
degree of cylinder air turbulence
B
firing pressure in the engine
C
quality of fuel to be injected
D
duration of the ignition delay period
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更多 “单选题The minimum fuel oil delivery pressure required for diesel engine injection depends primarily on the（）A degree of cylinder air turbulenceB firing pressure in the engineC quality of fuel to be injectedD duration of the ignition delay period” 相关考题
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If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because theA.cylinder compression pressure may not be high enoughB.cylinder compression temperature may be too highC.fuel oil injection pressure may not be high enoughD.scavenge and purge process is incomplete
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Low compression in a diesel engine could be caused byA.worn or broken cylinder liner sealing ringsB.high cooling water temperatureC.worn or broken piston ringsD.low fuel oil pressure
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单选题Care and cleanliness are required when installing diesel fuel filters （）.A
to prevent the fuel system from becoming air-houndB
to prevent the fuel system becoming clogged with dirty particlesC
both of the aboveD
to prevent the lubricating oil from leaking out of the filter element
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单选题One major disadvantage of a low-speed diesel as compared to a steam main-propulsion system is（）.A
the extra weight required for the diesel reduction gearingB
a minimum speed for the engines that limits the minimum speed of the vesselC
the higher fuel consumption per SHPD
the low efficiency of the system when a controllable pitch propeller is used
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单选题Fuel oil discharged to the diesel engine cylinder is atomized at the （）A
turbochargerB
injection nozzle tipC
carburetorD
fuel oil pump
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单选题If a tow-stroke/diesel engine is over-speeding due to leakage of lube oil into the cylinders, what should you do to stop the engine?（）A
Move the fuel control mechanism to the no fuel positionB
Block the fuel supply by closing the master fuel valveC
Shut off the fuel supply and block the flow of intake airD
Relieve all pressure in the fuel system
考题
单选题When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.A
filter to remove the fuel oilB
use the settler to remove the fuel oilC
remove the fuel oil by centrifugingD
drain and then renew the lube oil supply
考题
单选题If a diesel engine fails to start，one of the likely causes is （）A
low compression temperatureB
low ambient air pressureC
high lube oil pump pressureD
high fuel oil booster pump pressure
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单选题Low compression pressure in a diesel engine is caused by（）A
low water in the expansion tankB
improperly seated valvesC
low fuel oil pressureD
worn or broken cylinder liner sealing rings
考题
单选题Duty officer informs us that the vessel is out of harbor and in “Full Ahead”We are going to run （）.A
diesel oil instead of fuel oilB
fuel oil instead of diesel oilC
diesel oil instead fuel oilD
fuel oil instead diesel oil
考题
单选题A dirty fuel oil filter is can be detected by （） Ⅰ.fuel oil analysis Ⅱ.observing the pressure drop across the filterA
ⅠonlyB
ⅡonlyC
eitherⅠorⅡD
neitherⅠnor
考题
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
考题
单选题Low compression in a diesel engine could be caused by（）A
worn or broken cylinder liner sealing ringsB
high cooling water temperatureC
worn or broken piston ringsD
low fuel oil pressure
考题
单选题Crankcase explosions in propulsion diesel result from（）A
the splashing of lubrication oil by the crankshaftB
the dilution of crankcase oil with particles of combustionC
broken fuel lines spraying oil on the crankcaseD
the ignition of unburned fuel and air in the crankcase
考题
单选题If a diesel engine turned over at normal cranking speed but failed to start, the cause could be late fuel injection or （）A
excessive fuel pressureB
high lube oil viscosityC
inadequate fuel injectionD
excessive starting air pressure
考题
单选题Injection lag in a diesel engine may be caused by（）A
a higher cetane number of fuel oilB
the diesel fuel used having a high viscosityC
mechanical rigidity in the lube pump mechanismD
a decrease rigidity in the fuel pump delivery pressure
考题
单选题If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the （）.A
cylinder compression pressure may not be high enoughB
cylinder compression temperature may be too highC
fuel oil injection pressure may not be high enoughD
scavenge and purge process is incomplete
考题
单选题Ignition failure in an automatically controlled auxiliary boiler could be caused by（）A
carbon deposits on the flame scannerB
high fuel oil temperatureC
low fuel oil viscosityD
high steam pressure
考题
单选题The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.A
assist in a quick cutoff of fuel injectionB
allow oil backflow from the injector to the helixC
reduce fuel oil pressure between injection strokesD
meter the quantity of fuel delivered
考题
单选题Faulty operation of diesel engine fuel injection nozzles can be directly caused by （）.A
water in the fuel oil supplyB
excessive fuel nozzle holder coolingC
a distorted fuel spray patternD
leakage past the plunger into the oil drain
考题
单选题Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the （）A
electronic ignition systemB
compression of air by the pistonC
friction in the fuel injectorD
fuel oil bearing system
考题
单选题After the ship is out of the harbour and in “Full Speed”, well change （）.A
to fuel oil instead of diesel oilB
for fuel oil instead of diesel oilC
to diesel oil into fuel oilD
for diesel oil into fuel oil
考题
单选题Which of the following conditions is realized by the turbo-charging of a previously naturally aspirated diesel engine?（）A
Ignition lag increasesB
Lube oil system pressure increasesC
Brake specific fuel consumption increasedD
Mechanical efficiency increaded
考题
单选题When comparing different fuels for different engines, the ignition quality of diesel fuel oils becomes a less critical consideration as （）A
the amount of lube oil additives increaseB
piston speeds increaseC
injection pressure decreaseD
engine speeds decrease
考题
单选题Clogged diesel engine fuel oil filters can cause（）A
loss of powerB
misfiringC
low fuel oil pressureD
All of the above
考题
单选题Fuel oil transfer systems used onboard diesel propelled vessels are required to have （）.A
two fuel oil transfer pumps provided where one is to be independent of the main engineB
two fuel oil transfer pumps, with a combined capacity exceeding the maximum consumption of the main engineC
engine driven transfer pumps and only used in constant speed applicationsD
the capacity of the engine driven pump exceed the consumption rate of the engine to which it is attached
考题
单选题The most effective method in removing water from diesel fuel oil is by（）A
centrifuging the fuelB
using it in the engineC
heating the fuel tanksD
starting the fuel
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