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单选题
Diesel fuel is relatively safe to handle due to its low volatility, but the fumes will self-ignite and continue to burn steadily if the fuel is heated to the （）.
A
flash point
B
auto-ignition point
C
volatility point
D
upper explosive limit
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The cetane number of a diesel fuel oil indicates its ______.A.ignition qualityB.acid contentC.heating valueD.viscosity
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The cetane number of a diesel fuel oil indicates its ______.A.viscosityB.acid contentC.heating valueD.ignition quality
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What is an advantage of diesel over steam turbine propulsion ________．A.Less fuel consumption per SHPB.Diesel fuel costs less than bunker C or its equivalentC.Less routine maintenance requiredD.Less weight per SHP
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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
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单选题Due to excessive water in the fuel, a diesel engine fails to startBefore the engine can be started, the water must be removed from the （）.A
fuel pumpsB
cylindersC
fuel strainersD
all of above
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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
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单选题Which of the following procedures should be carried out to permit the use of a crosshead engine with an inoperable after-cooler?（）A
Bypass the after-cooler to operate at speedB
Run at reduced speed until the cooler can be repaired or renewedC
Switch to diesel fuel and run at full speedD
Nothing need to be done due to the low heating value of heavy fuel
考题
单选题A diesel engine will lose power if fuel injection occurs too early because the （）A
fuel will not be properly atomized in the cylinderB
ignition will be delayed due to low ignition temperatureC
maximum fuel expansion will occur on the compression strokeD
fuel will ignite before top dead center
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单选题A diesel engine may fail to start due to （）A
low air charge temperatureB
high cranking speedC
excessive fuel dilution of lube oilD
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单选题Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions, will be made easier by （）A
increasing the quantity of starting airB
increasing the lube oil pressureC
heating the engine fuel supplyD
heating the engine coolant
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单选题In a diesel engine, fuel must be broken up into a spray of fine droplets to （）.A
increase its qualityB
obtain complete burningC
reduce its weightD
all of the above
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单选题If the low level alarm of the diesel fuel day tank fails to function, you can expect trouble from（）A
overheated injection pumpsB
water condensed in the cylindersC
fuel dilution of the lube oilD
air in the fuel system
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单选题The cetane number of a diesel fuel oil indicates its（）A
ViscosityB
acid contentC
heating valueD
ignition quality
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formation of carbon on the intake and exhaust portsB
high water jacket temperaturesC
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an increase in lube oil viscosity due to fuel dilution
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单选题The ignition quality of diesel fuel is indicated by its（）A
octane numberB
cetane numberC
viscosity in Saybolt secondsD
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单选题Low compression pressure in a diesel engine may be the result of （）A
insufficient fuel supply due to fuel pump valves sticking or leakingB
excessive mechanical clearance between the piston crown and cylinder headC
excessively worn fuel pump plungerD
excessive exhaust back pressure
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单选题An operating turbocharged diesel engine that suddenly loses power, is due to a/an（）A
restricted turbocharger air intakeB
oil leak into the turbochargerC
dribbling injectorD
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单选题A diesel engine will lose power if fuel injection occurs too late in the cycle, because the（）A
fuel droplets will burn as they leave the fuel injectorB
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maximum expansion of the burned fuel cannot take place in the cylinderD
compression pressure will be too low to cause fuel ignition
考题
单选题Surface irregularities, such as erosion and pitting on injection pump plungers, will（）A
increase ignition delayB
affect fuel oil meteringC
affect engine performance at low speedD
only disappear due to fuel oil abrasion
考题
单选题If you suspect a diesel engine is misfiring due to air leakage into the fuel system, you should begin looking for the leak at the （）A
fuel line connections to cylinder injection valvesB
gasket surfaces of the fuel oil filtersC
discharge fitting of the fuel injector pumpsD
suction side of the fuel oil tran
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单选题When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）A
The diesel oil must never be allowed to mix with the heavy fuelB
The temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valveC
The heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valveD
The heating steam must be secured before the diesel oil passes through the three-way valve
考题
单选题When ship navigating in rough sea, the correct operation is （）A
navigating with a low diesel engine speedB
navigating with a stable diesel engine speedC
increasing the efficiency of propellerD
increasing fuel injection
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