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单选题
The ignition quality of a diesel fuel oil is indicated by the （）
A
specific gravity
B
cetane number
C
viscosity
D
calorific valve
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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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Crankcase explosions in propulsion diesel engines 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
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Which of the following conditions is realized by the turbo-charging of a previously naturally aspirated diesel engine?A.Ignition lag increases.B.Lube oil system pressure increases.C.Brake specific fuel consumption increases.D.Mechanical efficiency increases.
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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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单选题In diesel engineering practice, the term used to express the ignition quality of a particular fuel is（）A
cetane numberB
octane numberC
ignition index numberD
volatility point
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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
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单选题Before starting a diesel engine, you should always（）A
check the pyrometer readingsB
check the crankcase oil levelC
check the fuel oil strainersD
clean the fuel system
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单选题Fuel oil having a low cetane rating could result in（）A
improved cold weather startingB
excessive fuel oil consumptionC
reduced ignition lagD
smoother engine operation
考题
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 lube oil diluted with fuel oil is indicated by（）A
decreased viscosityB
decreased pour pointC
increased flash pointD
increased viscosity
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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The cetane number of a diesel fuel oil indicates its（）A
ViscosityB
acid contentC
heating valueD
ignition quality
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
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单选题The ignition quality of a fuel oil is an important operational consideration because it（）A
indicates the amount of abrasive material in the fuelB
affects the starting ability of a cold engineC
determines the amount of fuel penetration engineD
affects the compression ratio of an operating engine
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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
air fuel ratio
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单选题The ignition quality of a diesel fuel is indicated by the （）A
cetane numberB
volatility pointC
viscosity indexD
octane number
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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
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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
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单选题Combustion knock occurring in a diesel engine can be caused by （）.A
excessive fuel penetrationB
prolonged injection lagC
reduced ignition lagD
prolonged ignition lag
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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
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单选题Clogged diesel engine fuel oil filters can cause（）A
loss of powerB
misfiringC
low fuel oil pressureD
All of the above
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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 turbulenceB
firing pressure in the engineC
quality of fuel to be injectedD
duration of the ignition delay period
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