In the event of the cylinder starting valve leakage ______would pass into the air pipes and ignite the oil deposited.A.cooling waterB.vapor from the boilerC.starting airD.hot gases
In the event of the cylinder starting valve leakage ______would pass into the air pipes and ignite the oil deposited.
A.cooling water
B.vapor from the boiler
C.starting air
D.hot gases
相关考题：
第二组Under normal operation, some lubrication oil mist may be discharged from the air compressor to the air start system. This oil may be from excess compressor cylinder lubrication, from faulty oil scraper rings, or may even be suspended oil vapor contaminating the engine room atmosphere and drawn in at the compressor suction. Oil discharge is kept to a minimum by draining the after cooler, air receiver and starting system. If small quantities of lubrication oil do get passed into the starting air system, they will deposit as thin moist film over internal pipe surfaces but are not readily combustible. If a cylinder non-return valve leak while the engine is in operation, some hot gas, possibly with unburned fuel and cylinder lubrication oil, may be blown through the valve to the adjacent air manifold. With further heating from the leaky valve, this, together with the already deposited oil film, will carbonize and form. incandescent carbon. If starting air is applied to the system while still hot, the high pressure air coming into contact with the burning carbon may cause an explosion. Such an explosion will cause a flame to pass back through the air start pipe system, evaporating the deposited oil film and igniting it in the presence of air. Very high velocities and shockwaves are generated which may rupture pipes and fittings.Alternatively, if excessive oil has entered the air start system, a mixture of air and oil droplets may be discharged through the open cylinder non-return valve during starting. This spray may ignite due to high temperatures in the cylinder, causing a flame through the still open valve to the air manifold.To prevent an explosion, air start valves must be correctly maintained and lubricated to ensure correct timing and free movement with positive closing. Oil in the system must be kept to a minimum, pipe lines must be drained and cleaned internally when necessary and oil discharge from air compressors must be kept to a minimum by good maintenance.The passage is mainly aboutA.crankcase explosionB.scavenge box fireC.starting air pipeD.the danger of explosion in the starting air system
According to this passage, if the cylinder non-return valve were not leakyA.an explosion would not be causedB.there still would be a danger of explosionC.oil would not deposit in the air pipeD.pipe lines would not have to be drained
_______is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.A.An air receiverB.An operating valveC.An automatic valveD.An air distributor
In an operating diesel engine, which of the following conditions is an indication of a leaking air starting valve?A.Noise coming from that air starting valveB.Continuous operation of the starting air compressorC.Zero air pressure in the air starting systemD.Overheated starting air pipe to the cylinder head
单选题The opening or closing of the cylinder starting valve is controlled by （）.Athe starting air distributorBthe cut-off valve on the air mainCthe main starting valveDthe air bottle control valve
单选题Which of the following may cause that an engine doesnt turn on starting air?（）Atoo low starting air pressureBmain starting valve closedCneither A nor BDA and B
单选题When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the（）Aintake strokeBcompression strokeCpower strokeDexhaust stroke
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The compressed air is admitted to each cylinder through a cam operated by starting air valve when the piston has just passed its （）.ABDCBTDCCBBDCDATDC
单选题Opening of the cylinder （） will admit compressed air into the cylinder.Asafety valveBindicator cockCblow-down valveDstart valve
单选题Which of the following may cause that an engine doesnt run on starting air?（）Atoo low starting air pressureBmain start valve closedCneither A nor BDA and B
单选题In the starting system, the automatic valve is controlled by（）, and the cylinder start valves are controlled by（）Apilot air；pilot airBhandle；solenoidChandle；pilot air coming through the distributorDsolenoid；pilot air coming through the distributor
单选题Each cylinder has one starting valve which is usually opened by air pressure and closed by （）Anuts and boltsBnew jointsCspring forceDsealing rings
单选题Compressed air is supplied by air compression to （）.Athe air receiversBthe starting valvesCthe cylinder coversDthe distributors
单选题（） is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.AAn air receiverBAn operating valveCAn automatic valveDAn air distributor
单选题In the event of the cylinder starting valve leakage （） would pass into the air pipes and ignite the oil deposited.Acooling waterBvapor from the boilerCstarting airDhot gases
单选题In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.Adownwards；upwardsBupwards；downwardsCdownwards；downwardsDupwards；upwards
单选题（） supplies pilot air to control the cylinder air start valves.AAn air compressorBAn indicator cockCAn air distributorDA safety valve
单选题The cylinder cover is not provided with （）.Afuel valveBlubricatorCindicator valveDthe starting valve
单选题In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.Aby an fuel valveBthrough an inlet valveCwith an exhaust valveDfrom an outlet valve
单选题When the starting air valve closes on one cylinder, another starting air valve has （） opened on another cylinder whose piston has just commenced its downward stroke.AjustBnearlyCmerelyDalready
单选题In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）Anoise coming from that air starting valveBcontinuous operation of the starting air compressorCzero air pressure in the air starting systemDoverheated starting air pipe to the cylinder head
单选题The air distributor is conventionally driven by（） and distributes into each cylinder by（） certain sequence.Acamshaft；fresh airBcamshaft；starting airCelectronic motor which is controlled by a computer；fresh airDelectronic motor which is controlled by a computer；starting air
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Which of the following problems would be the probable cause for the faulty operation of a reciprocating air compressor suction valve?（）ACarbon build up in the piston ring beltBFaulty operation of a cylinder un-loaderCCompressor operation in an area of high relative humidityDLifting of intercooler rebel valve
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
单选题Failure to open the diesel engine test cocks after a long period of shutdown, prior to starting may result in （）Aan air bound fuel systemBdamage to cylinder heads and pistonsCexcessive fuel injectionDexcessive air valve lift