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单选题
Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires（）
A
grinding the spare plunger to the barrel
B
replacing the plunger and the barrel
C
highly polishing both the plunger and barrel
D
replacing plunger only
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更多 “单选题Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires（）A grinding the spare plunger to the barrelB replacing the plunger and the barrelC highly polishing both the plunger and barrelD replacing plunger only” 相关考题
考题
The plunger in a jerk pump is rotated until the release port is uncovered If the port remains uncovered all of the time, which of the listed operations will occur?A.No fuel will be deliveredB.The maximum effective stroke will be attainedC.The fuel delivered to the cylinder will be excessiveD.The injection nozzle will overheat and carbonize
考题
As the plunger moves upwards in the barrel, injection will commence once the plunger bas_______the spill ports and the pressure builds up.A.opened upB.closed offC.lined upD.taken off
考题
An increase in the fuel injection pump discharge pressure can be caused by a/an _______.A.leaking delivery valveB.excessive bearing end playC.plugged injector spray holeD.increased plunger stroke
考题
The amount of fuel delivered by a helical plunger fuel injection pump is controlled by ______.A.varying the pump discharge pressureB.varying the pump return pressureC.rotation of the pump plungerD.rotation of the pump barrel
考题
利用TCM软件清理Axios光谱仪Plunger的密封圈灰尘的操作步骤是（）A、关闭高压、放真空、启动TCM软件、选择第二项M、按F1关闭cap、按F3使Plunger向下，再按F1打开cap。B、放真空、关闭高压、启动TCM软件、选择第二项M、按F1关闭cap、按F3使Plunger向下，再按F1打开cap。C、放真空、关闭高压、启动TCM软件、选择第二项M、按F1关闭cap、按F2使Plunger向下，再按F1打开cap。D、关闭高压、放真空、启动TCM软件、选择第二项M、按F1关闭cap、按F3使Plunger向下，再按F1打开cap。
考题
单选题When disassembling or assembling an injection pump plunger and barrel you should （）A
keep the parts immersed in diesel fuelB
always keep the plunger and barrel togetherC
work over a linoleum-type surfaceD
all of the above
考题
单选题Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires（）A
grinding the spare plunger to the barrelB
replacing the plunger and the barrelC
highly polishing both the plunger and barrelD
replacing plunger only
考题
单选题It is important to note that the injection only takes place when the plunger is moving up the cam （）.A
base circleB
slopeC
bottom pointD
top point
考题
单选题In a jerk pump, the amount of fuel that will be forced through the spray nozzle on each upward stroke of the plunger depends on （）A
the pump supply pressureB
the slope of the fuel camC
how the plunger is rotatedD
the number of sleeve segments engaged with the rack
考题
单选题Movement of the pump control rack in a fuel injection system using individual plunger-type pumps （）A
changes the position of the fuel inlet portsB
changes the length of the pump strokeC
varies the quantity of fuel deliveredD
varies the compression of the delivery valve spring
考题
单选题In a unit injector the amount of fuel that will be forced through the spray nozzle on each stroke of the plunger depends on （）A
the pump supply pressureB
the slope of the fuel camC
how the plunger is rotatedD
the number of sleeve segments engaged with the rack
考题
单选题The plunger is machined to very fine tolerances, as is the matched（）in which it reciprocates.A
barrelB
ramC
pistonD
rod
考题
单选题Maintaining the close tolerances in diesel fuel pumps and injectors requires the use of（）.A
fuel/water separatorsB
day tanksC
injector test standD
fuel filters
考题
单选题Diesel engine injection lag is caused by（）A
compressibility of the fuelB
high fuel oil supply flowC
scored plunger and barrel packingD
excessive air turbulence
考题
单选题The plunger may be rotated in the barrel by a rack and （） on a sleeve which is keyed to the plunger.A
pinion arrangementB
push rodC
handle barD
cam device
考题
单选题The fuel injector pump is operated by （） which drives the plunger up and down.A
a separate motorB
a camC
a generatorD
a chain
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The effective pump stroke of an individual port-and-helix fuel injection pump is determined by the （）A
fuel delivery pressureB
pump plunger diameterC
plunger control rack positionD
total pump stroke
考题
单选题Faulty operation of diesel engine fuel injection nozzles can be directly caused by （）.A
water in the fuel oil supplyB
excessive fuel nozzle holder coolingC
a distorted fuel spray patternD
leakage past the plunger into the oil drain
考题
单选题If the plunger or barrel of a fuel injection jerk pump becomes damaged,（）A
only the replacement of the entire pump would be acceptableB
the injection pump and injection nozzle must be replacedC
either the barrel or plunger must be replacedD
the barrel and plunger must be replaced as a unit
考题
单选题As the plunger moves up, the ports are closed and the fuel （） and delivered to the injector nozzle at very high pressure.A
being compressedB
to be pumped upC
is pressurizedD
are built up
考题
单选题The plunger in the fuel injector pump, usually operated by a （）, is driven up and down when working.A
crankshaftB
camshaftC
piston rodD
rack and pinion
考题
单选题A common trouble with the fuel pump plunger or fuel valve spindle is （）.A
water leakageB
steam leakageC
oil leakageD
air leakage
考题
单选题The amount of fuel delivered by a helical plunger fuel injection pump is controlled by （）A
varying the pump discharge pressureB
varying the pump return pressureC
rotation of the pump plungerD
rotation of the pump barrel
考题
单选题The injector pump is operated by a cam which drives the plunger （）.A
top and bottomB
to and froC
up and downD
back and forth
考题
单选题An increase in the fuel injection pump discharge pressure can be caused by a/an （）A
leaking delivery valveB
excessive bearing end playC
plugged injector spray holeD
increased plunger stroke
考题
单选题The plunger in a jerk pump is rotated until the release port is uncoveredIf the port remains uncovered all of the time, which of the listed operations will occur?（）A
No fuel will be deliveredB
The maximum effective stroke will be attainedC
The fuel delivered to the cylinder will be excessiveD
The injection nozzle will overheat and carbonize
考题
单选题As the plunger moves upwards in the barrel, injection will commence once the plunger has （） the spill ports and the pressure builds up.A
opened upB
closed offC
lined upD
taken off
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