网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
The rate of fuel injection in a diesel engine cylinder depends primarily on （）.
A
the size of the holes in the fuel nozzle
B
timing of the pump
C
supply pressure to the pump
D
shape of the combustion chamber
参考答案
参考解析
解析：
暂无解析
更多 “单选题The rate of fuel injection in a diesel engine cylinder depends primarily on （）.A the size of the holes in the fuel nozzleB timing of the pumpC supply pressure to the pumpD shape of the combustion chamber” 相关考题
考题
If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will_________.A.backfire through the air intakesB.develop less power under loadC.have high firing pressuresD.lift its cylinder relief valves
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
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
考题
单选题The main purpose of changing main engine to electronic controlled is not to（）A
control fuel injection time more preciselyB
control fuel injection rate more preciselyC
meet the environmental requirementsD
meet high engine speed requirements
考题
单选题Problems with the diesel engine fuel injection pump are usually caused by（）A
improper adjustmentB
contaminated fuelC
kinked fuel linesD
excessive engine vibration
考题
单选题A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to （）A
feel the high pressure fuel lineB
check the cylinder exhausts for white smoke frequentlyC
check the cylinder exhaust temperatureD
isolate each cylinder and inspect the injector
考题
单选题If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an （）A
excessively late injection timing for each cylinderB
incorrectly adjusted intake valve timingC
incorrectly adjusted fuel injectorD
incorrectly adjusted intake valve clearance
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A drop in compression pressure in one cylinder of a diesel engine can be caused by（）A
a leaking fuel injection nozzleB
a clogged air filterC
early fuel injectionD
burned valves
考题
单选题The term “proper metering”, as applied to a diesel fuel injection system, can be best defined as （）.A
delivering the same quantity of fuel to each cylinder for each power stroke according to engine loadB
maintaining the metering adjustment for a reasonable period under all load conditionsC
timing fuel injection to obtain maximum power and good fuel economyD
distributing the fuel to all parts of the combustion chamber for proper combustion
考题
单选题High firing pressures and a low exhaust temperature in a diesel engine may result from （）.A
decreased piston to cylinder head clearanceB
increased exhaust system back pressureC
early fuel injection timingD
low scavenge air temperature
考题
单选题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
考题
单选题If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will（）A
backfire through the air intakesB
develop less power under loadC
have high firing pressuresD
lift its cylinder relief valves
考题
单选题A change in the quality of fuel atomization by a diesel engine fuel injector would be caused by a/an （）A
increase in engine speedB
increase in cylinder turbulenceC
leaking needle valveD
reduction in cylinder turbulence
考题
单选题The amount of fuel injection into a diesel engine cylinder by a unit injector, is controlled by（）A
the firing pressure in the cylinderB
a metering helix inside the pumpC
varying the physical length of the plunger strokeD
varying the clearance between the injector cam and the injector rocker arm
考题
单选题Late fuel injection in a diesel engine is indicated by low firing pressure with（）A
high exhaust temperatureB
low exhaust temperatureC
fuel knock in each cylinderD
mechanical knock in each cylinder
考题
单选题The amount of fuel delivered for each cycle must be in accordance with the engine load, and the same quantity of fuel must be delivered to each cylinder for each power stroke at that load.Which of the following statements describes this requirement?（）A
Proper timingB
Accurate meteringC
Suitable injection rateD
Suitable atomization rate
考题
单选题A change in the degree of fuel atomization in a diesel engine would most greatly affect （）.A
air turbulenceB
fuel penetrationC
fuel spray angleD
fuel injection rate
考题
单选题If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）A
early injection timingB
worn orifices in the injection nozzlesC
worn or scored cylinder linersD
using a fuel with too low of a cetane number
考题
单选题Significant retardation of a diesel engine fuel injection timing will result in （）A
smoother engine operationB
advanced fuel ignitionC
increased fuel economyD
reduced engine power
考题
单选题Late fuel injection occurring at, or after TDC in a diesel engine is indicated by excessive exhaust smoke and （）A
low exhaust temperatureB
low firing pressureC
fuel knock in each cylinderD
mechanical knock in each cylinder
考题
单选题In the cylinder of a diesel engine fuel is ignited by the（）A
spark from a plug in the pre-combustion chamberB
electrical discharge from the distributorC
heat of compression within the cylinderD
heat from the fuel injection nozzle
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
热门标签
最新试卷