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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 arrangement
B
push rod
C
handle bar
D
cam device
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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
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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The plunger is machined to very fine tolerances, as is the matched（）in which it reciprocates.A
barrelB
ramC
pistonD
rod
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VoltageB
FrequencyC
Power Source Loading （max）D
Power Source Loading （typical）
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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
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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
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单选题In automatic （） the winch may be overhauled and wire is paid off the barrel at a pre-determined maximum tension.A
cranesB
windlassC
capstansD
mooring winches
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单选题A virtual rise in the center of gravity of a ship may be caused by（）.A
filling a partially filled tankB
using fuel from a pressed fuel tankC
emptying a partially filled tankD
transferring pipe from the setback area to the pipe rack
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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
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单选题With reference to an axial piston pump, which one of the following statements is true?（）A
The cylindrical barrel is coupled to the motorB
The cylindrical barrel has an odd number of boresC
The bores end in socketsD
The sockets fit in the swash plate
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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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
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