单选题The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.Aassist in a quick cutoff of fuel injectionBallow oil backflow from the injector to the helixCreduce fuel oil pressure between injection strokesDmeter the quantity of fuel delivered
单选题
The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.
A
assist in a quick cutoff of fuel injection
B
allow oil backflow from the injector to the helix
C
reduce fuel oil pressure between injection strokes
D
meter the quantity of fuel delivered
参考解析
解析：
暂无解析
相关考题：
A Kort nozzle is a(n) ______.A.hollow tube surrounding the propeller used to improve thrustB.nozzle attached to a firefighting hoseC.intake valve on a diesel engineD.piston cylinder on a diesel engine
单选题A check valve is another name for （）.Aa test valveBan inspection valveCa stop valveDa non-return valve
单选题The main purpose of starting the diesel engine on air briefly is（）Ato inspect if the cylinder has the water leakageBto expel out the residual water/gas/oil from the cylinderCto check if fuel supply is normalDA and B
单选题The primary function of a fuel delivery check valve assembly is to（）Adeliver proper fuel quantity to the injection nozzleBprovide rapid fuel injection cutoffCcontrol fuel quantity entering the pump bodyDcontrol fuel pressure delivered to the combustion chamber
单选题Hydraulic control check value is generally used to （） in the marine hydraulic mechanism.Acontrol the back pressure of return oilBlock the oil lines under some conditionsCchange the direction of oil flowDact as relief valve
单选题Which of the valves listed should be used either in the fully opened or the fully closed position?（）AA gate valveBA globe valveCAny check valveDAny needle valve
单选题Which one of following statement is not true concerning the suitable sites of the direct acting relief valve and the pilot operated relieve valve?（）Athe direct acting relief valve is used for controlling lower flows and pressureBthe pilot operated relief valve is used for controlling higher flows and pressureCthe pilot operated relief valve is used for controlling lower flows and pressureDthe controlling accuracy of direct acting relief valve is worse than that of the pilot operated relief valve
单选题The purpose of the compensating adjustment used in a diesel engine hydraulic governor is to （）Acompensate for low oil levelBincrease governor promptnessCprevent governor huntingDlimit engine load
单选题Diesel engine cylinder head test cocks are used to（）Acheck cylinder lubrication prior to starting engineBconnect exhaust gas analyzers to determine engine efficiencyCpressure test cylinder heads to check for leaksDremove moisture accumulations from cylinder prior to starting
单选题Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.Afuel oil vapor at the sludge tank ventBunburned fuel vapors in the scavenge air receiverClube oil vapors in the crank caseDlube oil vapors in the engine room
单选题Which of the following methods is used to prevent throttling of compressed air through the diesel engine air starting valves?（）AHolding the valve open for a long periodBIncreasing the starting air pressure usedCOpening the stating air valve quicklyDReducing the starting air valve size
单选题Which of the following is the purpose of the sigverif.exe utility?（）AEncrypt a file for secured electronic delivery.BConfirm the digital certificate to check file integrity.CRemove non-certified drivers from the driver cache.DChoose the level of driver certification to use when installing device drivers.
单选题The（）enables water to be blow down or emptied from the boilerIt may be used when partially or completely emptying the boiler.Amain stem stop valveBauxiliary steam stop valveCfeed check or control valveDblow down valve
单选题A non-return valve in the air delivery line near to the compressor must be （）type similar to the compressor discharge valve.Athe low inertiaBthe high inertiaCthe low velocityDthe high velocity
单选题Diesel engine air start valve timing is controlled by（）Aengine operating speedBan air manifoldCa hydraulic distributorDindividual cams and valve gear
单选题The valve which is most suited for regulating the flow through a pipeline is a （）Agate valveBglobe valveCswing-check valveDplug-cock valve
单选题An orifice-check valve placed in a hydraulic system is used to（）Aregulate the fluid flow in either directionBrestrict movement of hydraulic fluid in one direction, but allow free movement in the other directionCallow free movement of hydraulic fluid in both directionsDallow a restricted fluid flow in one direction only
单选题Injection lag in a diesel engine may be caused by（）Aa higher cetane number of fuel oilBthe diesel fuel used having a high viscosityCmechanical rigidity in the lube pump mechanismDa decrease rigidity in the fuel pump delivery pressure
单选题The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.Aassist in a quick cutoff of fuel injectionBallow oil backflow from the injector to the helixCreduce fuel oil pressure between injection strokesDmeter the quantity of fuel delivered
单选题A loud clicking noise from the valve compartment of an operating diesel engine would indicate（）Aworn valve seatsBworn main bearingCexcessive valve clearanceDweak rocker arm springs
单选题A swing check valve is used in a pipeline to （）.Amaintain a preset pressure on the lineBclosely regulate the amount of flowCrelieve excessive pressure on the lineDallow flow in one direction only
单选题Valve cages are used on some large diesel engines to （）Areduce wear on the valve stemBpermit the use of alloy valve seat materialsCreduce heat transfer from the valve seatDfacilitate valve removal for servicing
单选题A Kort nozzle is a(n)（）.Ahollow tube surrounding the propeller used to improve thrustBnozzle attached to a firefighting hoseCintake valve on a diesel engineDpiston cylinder on a diesel engine
单选题The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by（）Agovernor flyweight action on a pilot valve which controls fuel injectionBgovernor flyweight motion acting on fuel controls through suitable linkageCpositioning a butterfly valve in the fuel delivery system positioningDa servomotor piston attached to the fuel controls
单选题Turbocharged four-stroke/cycle diesel engines utilize valve overlap for（）.Aimproving cylinder scavengingBpreheating the combustion chamberCreducing air charge densityDpreventing valve wear
单选题The diesel engine must be started before it can run by it self For this purpose （） has to be used.Aa starting systemBthe starting airCa starting operationDA, B and C
单选题The timing of diesel engine air starting valves is controlled by（）Athe air start valve timing gears and rodsBa cylinder check valveCindividual cams and valve gearDan air manifold poppet valve