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单选题
The ignition quality of diesel fuel is indicated by its（）
A
octane number
B
cetane number
C
viscosity in Saybolt seconds
D
air fuel ratio
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Fuel droplets injected into a diesel engine cylinder must have adequate penetration to ____.A.prolong the ignition delay periodB.ensure the beginning of fuel injectionC.thoroughly utilize the air chargeD.allow controlled fuel combustion
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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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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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In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with ______.A.low firing pressureB.low exhaust temperatureC.mechanical knock in each cylinderD.fuel knock in each cylinder
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What quality of a diesel fuel is most significant for efficient combustion ________．A.VolatilityB.ViscosityC.Flash pointD.Specific heat
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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 pointB
auto-ignition pointC
volatility pointD
upper explosive limit
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单选题The ignition of the fuel in diesel engine is caused by the （） of compression of the air previously admitted into the cylinders.A
vacuum pressureB
specific gravityC
heatD
viscosity
考题
单选题In an operating diesel engine, pre-ignition can be caused by （）A
excessively late fuel injectionB
oil in the air chargeC
water in the fuelD
injection continuing after the fuel charge is ignited
考题
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
考题
单选题The higher the cetane number, （） the ignition quality of the fuel.A
the worseB
the betterC
the smallerD
the greater
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
考题
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
考题
单选题The longer the ignition delay period occurs in a diesel engine, the （）.A
less fuel will enter the cylinderB
lower will be cylinder compression temperaturesC
more complete will be fuel combustionD
more rapid will be the rise in combustion pressure
考题
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The ignition quality of a diesel fuel oil is indicated by the （）A
specific gravityB
cetane numberC
viscosityD
calorific valve
考题
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Poor quality fuel being used in a turbocharged medium-speed, diesel engine could result in （）A
hard startingB
excessive fuel consumptionC
loss of powerD
all of the above
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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
fuel will not be properly atomized in the cylinderC
maximum expansion of the burned fuel cannot take place in the cylinderD
compression pressure will be too low to cause fuel ignition
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单选题Fuel droplets injected into a diesel engine cylinder must have adequate penetration to （）A
prolong the ignition delay periodB
ensure the beginning of fuel injectionC
thoroughly utilize the air chargeD
allow controlled fuel combustion
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
考题
单选题The cetane rating of diesel fuel is an indication of the （）A
ignition quality of the fuelB
calorific value of the fuelC
flash point of the fuelD
rate of fuel consumption
考题
单选题When restarting a heavy fuel diesel engine that has been stopped for some time, the engine should（）A
increase the starting air pressureB
use a higher than normal cranking speedC
increase the fuel injection pressureD
use a fuel having a lower ignition temperature
考题
单选题The rate of pressure rise during the period following fuel ignition in a diesel will result in （）A
valve overlapB
volumetric efficiencyC
turbulence of the air changeD
fuel efficiency
考题
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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