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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 system
B
compression of air by the piston
C
friction in the fuel injector
D
fuel oil bearing system
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更多 “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” 相关考题
考题
If you suspect a diesel engine is misfiring due to air leakage into the fuel system, you should begin looking for the leak at 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
考题
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
考题
Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily byA.heat conduction into the injected fuel oilB.heat conduction into the water jacket wallC.water circulation through passages in the holderD.fuel oil circulation through passages m the holder
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Persistent knocking in one cylinder of an eight cylinder diesel engine would MOST likely be caused by______.A.using fuel oil with low cetane numberB.a badly worn piston pinC.a loose flywheel keyD.a loose bed plate bolt
考题
单选题Low compression in a diesel engine can be caused by （）A
clogged coolant passagesB
a leaking cylinder head gasketC
low fuel oil pressureD
worn or broken cylinder liner sealing rings
考题
单选题Which of the listed problems would be indicated by an accumulation of water in one cylinder, in addition to the crankcase of an idle diesel engine?（）A
Excessive cylinder linerB
water in the fuel systemC
Cracked cylinder linerD
Leaking lube oil cooler
考题
单选题Fuel oil discharged to the diesel engine cylinder is atomized at the （）A
turbochargerB
injection nozzle tipC
carburetorD
fuel oil pump
考题
单选题Heat damage to fuel injection nozzles on small high-speed diesel engines, can be prevented by（）A
employing fuel oil as a cooling mediumB
preventing hard carbon deposit on nozzle tipsC
avoiding fuel oil temperature exceeding builder’s specificationD
ensuring good metallic contact between nozzles and cylinder heads
考题
单选题The primary purpose of oil control rings on a diesel piston is to（）A
provide a reservoir for cylinder lubricationB
pump oil into the combustion space for cylinder coolingC
prevent excessive lubricating oil consumptionD
allow hydraulic oil film formation on the cylinder
考题
单选题Heat damage to fuel injection nozzles can be prevented by avoiding （）A
excessive fuel oil temperatureB
long periods of engine overloadC
metallic contact between nozzles and cylinder headsD
hard carbon deposit and varnish on the nozzles
考题
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
考题
单选题Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in （）A
increased horsepowerB
reduced efficiencyC
increased heat lossD
lower cylinder pressures
考题
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What is one effect of running a diesel engine at too cool a temperature? （）A
Buildup of sludge in the lubricating systemB
Excessive fuel consumptionC
Severe heat stresses on mechanical partsD
Foaming of the lubricating oil
考题
单选题Fuel is ignited in a diesel engine cylinder by （）A
a spark plugB
injectorsC
the heat of compressionD
increasing jacket water temperatures
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One result of operating a diesel engine at light load with excessively low cooling water temperature is a/an （）A
decrease in ignition lagB
increase in fuel economyC
reduction in lube oil viscosityD
increase in cylinder misfiring
考题
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
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Fuel oil begins injection into the cylinder of a four-stroke/cycle diesel engine during the （）.A
intake strokeB
exhaust strokeC
power strokeD
compression stroke
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One of function of diesel engine lubricating oil is to （）A
induce carbon formation on cylinder wallsB
improve fuel penetration in the combustion spaceC
form a friction reducing film between mating surfacesD
lubricate the fuel injection
考题
单选题The function of diesel engine piston compression rings is to （）.A
prevent piston side thrustB
prevent engine friction lossesC
transmit heat from the piston to the cylinder linerD
remove oil from the cylinder combustion space
考题
单选题Piston compression rings used in a diesel engine function to （）A
transfer heat from the cylinder to the pistonB
scrape oil from the sides of the pistonC
seal the combustion space from the crankcasesD
prevent any piston contact with the cylinder liner
考题
单选题Fuel injected into a diesel engines cylinder is ignited by （）.A
the heat compressed fuel/air mixture in the cylinderB
the fuel igniterC
the fuel injectorD
the fuel pump
考题
单选题Fuel oil injected into the cylinder of a diesel engine just after the piston passes top dead center, will（）A
increase engine powerB
increase engine loadC
decrease engine powerD
improve fuel economy
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