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?（）ANo fuel will be deliveredBThe maximum effective stroke will be attainedCThe fuel delivered to the cylinder will be excessiveDThe injection nozzle will overheat and carbonize
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 delivered
B
The maximum effective stroke will be attained
C
The fuel delivered to the cylinder will be excessive
D
The injection nozzle will overheat and carbonize
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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
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
If it becomes necessary to pump bilges while a vessel is in port, which of the following procedures should be followed?A.Pump only if the discharge is led to a shore tank or bargeB.Pump only during the hours of darknessC.Pump only on the outgoing tideD.Pump only as much as is necessary
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
If you must pump bilges while a vessel is in port，you should pump only ______．A.If discharge is led to a shore tank or bargeB.During the hours of darknessC.On the outgoing tideD.As much as is necessary
Which method should be used to warm up the pump turbines prior to discharge ________．A.Lock the turbine rotor and slowly bleed in steam until operating temperature is reachedB.Run the pump at high speed with the discharge valves closedC.Run the turbine at slow speed with the pump disconnectedD.Shut the discharge valve and run the pump at slow speed
At the discharging port, tankers pump the oil ashore using （）.A、shore pumpsB、her own pumpsC、large pumpsD、large tubes
At the （）port, tankers pump the oil ashore using her own pumps.A、dischargingB、loadC、loadingD、charging
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 （）Athe pump supply pressureBthe slope of the fuel camChow the plunger is rotatedDthe number of sleeve segments engaged with the rack
单选题While overhauling a jerk-type fuel pump it is necessary to replace the pump plungerWhich of the parts listed below must also be replaced?（）ADelivery check valveBPump barrelCTubing to the injectorDCam follower
单选题Movement of the pump control rack in a fuel injection system using individual plunger-type pumps （）Achanges the position of the fuel inlet portsBchanges the length of the pump strokeCvaries the quantity of fuel deliveredDvaries the compression of the delivery valve spring
单选题The plunger in the fuel injector pump, usually operated by a （）, is driven up and down when working.AcrankshaftBcamshaftCpiston rodDrack and pinion
单选题A common trouble with the fuel pump plunger or fuel valve spindle is （）.Awater leakageBsteam leakageCoil leakageDair leakage
单选题Under normal conditions a liferaft is released from itscradle by（）.Acutting the restraining strapBunscrewing the turnbuckle on the back of the cradleClifting one end of the raftDpushing the plunger on the center of the hydrostatic release
单选题Which of the following is operated from the main engine room console on an automated vessel?（）AFire pump and lube oil pumpBLube oil pump and distilling plantCDistilling plant and shaft alley doorDShaft alley door and fixed CO2 release
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单选题The fuel injector pump is operated by （） which drives the plunger up and down.Aa separate motorBa camCa generatorDa chain
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