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单选题
The fuel oil system for a diesel engine can be considered in two parts--the fuel supply and the （） systems.
A
fuel treatment
B
fuel combustion
C
fuel injection
D
fuel separating
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If you suspect a diesel engine is misfiring due to air leakage into the fuel system, you should begin looking for the leak at theA.fuel line connections to the cylinder injection valvesB.gasket surfaces of the fuel oil filtersC.discharge fittings of the fuel injector pumpsD.suction side of the fuel oil transfer pump
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Prolonged operation of a diesel engine with a closed cooling water system, at lower than normal designed operating temperatures can ______.A.increase power outputB.decrease lube oil viscosityC.eliminate fuel knockD.cause sulfuric acid formation
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单选题Dirt in a fuel oil system of a diesel engine can cause （）A
damage to strainersB
over-speeding of the engineC
excessive cooling of the engineD
injector damage
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单选题A diesel engine is turned at normal cranking speed, but fails to fireThis can occur from （）A
low lube oil temperatureB
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air in the fuel injectionD
water in the starting air system
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单选题Stating a large propulsion diesel engine using diesel fuel during cold weather conditions can be made easier by （）A
increasing the quantity of starting airB
increasing the lube oil pressureC
heating the engine fuel supplyD
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单选题White smoke exhausting from a diesel engine can be caused by （）A
low combustion temperatureB
a leaking fuel nozzle check valveC
late fuel injectionD
plugged oil-scraper ring hole
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ignition lagB
engine horsepowerC
lube oil system pressureD
specific fuel consumption
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单选题Leaking oil seals on a diesel engine turbocharger can cause（）A
the engine to run after the fuel has been securedB
the engine to over-speedC
a fireD
all of the 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
Relieve all pressure in the fuel system
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单选题Fuel oil contamination of an auxiliary diesel engine lube oil can result in（）A
an increased flash pointB
higher lube oil pressuresC
an increased viscosityD
lower lube oil pressures
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单选题A diesel engine is turned at normal cranking speed and no ignition occursThis could be the result of （）A
low lube oil temperatureB
low starting air temperatureC
air bubbles in the fuel oil systemD
water in the starting air system
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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
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单选题Diesel engine fuel oil contamination often results in （）A
governor malfunctionsB
fuel injection system malfunctionsC
high cylinder lube oil temperaturesD
low intake temperatures
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单选题Late fuel oil injection in a diesel engine can result in （）A
fuel knockB
increased powerC
low compression pressureD
high exhaust temperature
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单选题Worn diesel engine intake valve guides can result in （）A
increased engine breathing efficiencyB
excessive valve lashC
excessive lube oil consumptionD
lower than normal fuel consumption
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单选题Dirt in the fuel oil system of a diesel engine can cause （）.A
clogged filtersB
poor combustionC
overloading of the dieselD
shock of fuel lines
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单选题Permitting a diesel engine fuel oil day tank to run dry can cause （）A
overheated injection pumpsB
water condensation in the cylindersC
fuel dilution of the lube oilD
air in the fuel system
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单选题Engine coolant accumulating in the diesel engine lubricating oil can result from a （）A
low oil pressureB
high coolant pressureC
leaking fuel injectorD
cracked cylinder head or liner
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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
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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
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单选题Diesel engine lube oil can become contaminated as a result（）A
the water produced during combustionB
the sulfur in the fuelC
unburned fuel oilD
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单选题Sludge formation in a diesel engine lube oil system is caused by（）A
carbonization of oils from the combustion chambersB
emulsions of lube oil and waterC
coagulation of unburned fuel below the piston ringsD
all of the above
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
考题
单选题Lubricating oil viscosity in an operating diesel engine can be reduced by（）A
increasing cooling water flowB
increasing lube oil flowC
dilution by fuel oilD
adding SAE 70 oil
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On a diesel engine, fuel is delivered into the combustion space by （）.A
a cooling systemB
a lubrication oil systemC
an electric systemD
an injection system
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单选题If a diesel engine runs out of fuel, you can expect trouble from （）A
overheated injection pumpsB
water condensation in the cylindersC
fuel dilution of the lube oilD
air in the fuel system
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