The cetane number of a diesel fuel oil indicates its ______.A.ignition qualityB.acid contentC.heating valueD.viscosity
The cetane number of a diesel fuel oil indicates its ______.
A.ignition quality
B.acid content
C.heating value
D.viscosity
相关考题：
Which of the listed factors will indicate the most about the ability of a fuel to ignite in a diesel engine?A.ViscosityB.Sulfur contentC.Pour pointD.Cetane number
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.
Which of the following represents the significance the fuel oil cetane number?A.The cetane number has no affect on injection lagB.The cetane number is an indication of the fuel's viscosityC.Ignition lag is reduced with fuels having a high cetane numberD.The cetane number is of little significance in the combustion process
The cetane number of a diesel fuel oil indicates its ______.A.viscosityB.acid contentC.heating valueD.ignition quality
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
单选题A decrease in the flash point of diesel engine lube oil indicates the lube oil has become （）.Acontaminated with sludgeBcontaminated with carbonCdiluted with fuel oilDdiluted with water
单选题Black smoke exhausting from a diesel engine indicates（）Aproper fuel injectionBwater in the fuelCincomplete combustionDburning of lube oil
单选题Fuel oil having a low cetane rating could result in（）Aimproved cold weather startingBexcessive fuel oil consumptionCreduced ignition lagDsmoother engine operation
单选题When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.Afilter to remove the fuel oilBuse the settler to remove the fuel oilCremove the fuel oil by centrifugingDdrain and then renew the lube oil supply
单选题Which of the following conditions indicates the dilution of diesel engine lube oil by fuel oil?（）AWater discharging from the water outlet of the lube oil purifierBFuel oil discharging from the water outlet of the lube oil purifierCLube oil discharging from the water outlet of the lube oil purifierDA change in the lube oil viscosity
单选题Duty officer informs us that the vessel is out of harbor and in “Full Ahead”We are going to run （）.Adiesel oil instead of fuel oilBfuel oil instead of diesel oilCdiesel oil instead fuel oilDfuel oil instead diesel oil
单选题Which of the following statements is true concerning the cetane number of diesel fuel?（）AThe cetane number affects the amount of injection lagBThe cetane number is an indication of the fuels viscosityCIgnition lag is reduced with fuels having a high cetane numberDThe cetane number is of little significance in the combustion process
单选题The cetane number rates fuels for diesel engines according to its （）Aantiknock characteristicsBignition qualitiesCrates of vaporizationDviscosity
单选题Which of the following statements is true concerning the cetane number rating of diesel fuel? （）AThe cetane number is obtained by comparing the fuel with cetane a colorless liquid hydrocarbonBThe higher the cetane number, the shorter the ignition lagCThe highest cetane number of fuel is 100DAll of the above
单选题The higher the cetane number, （） the ignition quality of the fuel.Athe worseBthe betterCthe smallerDthe greater
单选题The cetane number of a diesel fuel oil indicates its（）AViscosityBacid contentCheating valueDignition quality
单选题The Total Base Number (TBN) value of diesel engine lube oil refers to its ability to （）Aresist changes in viscosity with changes in temperatureBresist emulsificationCneutralize acidsDresist oxidation at high temperatures
单选题Injection lag in a diesel engine may be caused by（）Aa higher cetane number of fuel oilBthe diesel fuel used having a high viscosityCmechanical rigidity in the lube pump mechanismDa decrease rigidity in the fuel pump delivery pressure
单选题If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）Aearly injection timingBworn orifices in the injection nozzlesCworn or scored cylinder linersDusing a fuel with too low of a cetane number
单选题When fuel enters the crankcase of a diesel engine, it （）Adilutes the lube oil and reduces its viscosityBforms sulfuric acid in the lube oilCcauses pitting and failure of the bearingsDcauses sludge deposits on valve stems
单选题After the ship is out of the harbour and in “Full Speed”, well change （）.Ato fuel oil instead of diesel oilBfor fuel oil instead of diesel oilCto diesel oil into fuel oilDfor diesel oil into fuel oil
单选题If a used lube oil analysis indicates excessive fuel dilution, the lube oil should be （）AchangedBcentrifugedCfilteredDsettled
单选题If the chemical analysis of a lube oil sample taken from a diesel engine indicates an increased neutralization number, the （）.Aacidity has increasedBviscosity has decreasedCdemulsibility has improvedDfoaming is guaranteed to occur
单选题Which of the following represents the significance the fuel oil cetane number?（）AThe cetane number has no affect on injection lagBThe cetane number is an indication of the fuel’s viscosityCIgnition lag is reduced with fuels having a high cetane numberDThe cetane number is of little significance in the combustion
单选题The cetane rating of diesel fuel is an indication of the （）Aignition quality of the fuelBcalorific value of the fuelCflash point of the fuelDrate of fuel consumption
单选题Clogged diesel engine fuel oil filters can cause（）Aloss of powerBmisfiringClow fuel oil pressureDAll of the above
单选题A mixture of 45%cetane and 55% alpha-methyl-naphthalene is found to have the same ignition delay as a sample of diesel oil √The sample can be described as having a/an（）Acetane number of 55Bcetane number of 45Coctane number of 55Doctane number of 45