单选题（） device is provided to prevent starting air from being admitted to the cylinder before the reversing is completed.AAn automaticBA transmissionCA self-regulatingDAn interlocking
单选题
（） device is provided to prevent starting air from being admitted to the cylinder before the reversing is completed.
A
An automatic
B
A transmission
C
A self-regulating
D
An interlocking
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US and allied officials have said they have seen no credible evidence of civilian casualties（伤亡）from the air campaign,and they say that precision weapons are used in the strikes in an effort to()being hurt．A． prevent civilians onB．prevent civilians fromC． Prevent civilians toD．Prevent civilians in
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
Vessels having main engines arranged for air starting are to be provided with at least__.A.one automatic drain serving both containersB.two air starting containers of approximately equal sizeC.one control air container and one starting air containerD.one additional means of starting the main engine
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
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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
______device is provided to prevent starting air from being admitted to the cylinder before the reversing is completed.A.An automaticB.A transmissionC.A self-regulatingD.An interlocking
The boom stops are installed on an offshore crane to ______.A.prevent the boom from being raised too highB.prevent the boom from swingingC.support the boom when not in useD.prevent the boom from being lowered
Which of the following is not information provided from an IP phone to a Catalyst switch using CDP？（）A、 device PoE requirementsB、 device IP addressC、 device voice VLAN IDD、 device platform
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单选题Vessels having main engines arranged for air starting are to be provided with at least （）Aone automatic drain serving both containersBtwo air starting containers of approximately equal sizeCone control air container and one starting air containerDone additional means of starting the main engine
单选题Which of the following actions will prevent a driver from being reinstalled automatically？（）A Run the disable command.B Disable the device using Device Manager.C Review manufacturer manual.D Reboot the server， logon in Safe Mode， uninstall the driver.
单选题A diesel engine is turned at normal cranking speed, but fails to fireThis can occur from （）Alow lube oil temperatureBlow starting air temperatureCair in the fuel injectionDwater in the starting air system
单选题When the order （） is received from the bridge, the main air stop valve in the starting air line should be shut.Astand-by engineBfull aheadCfinished with engineDfull away
单选题By far the greatest use is for diesel engine starting using air pressure of 25 bar or more provided by （）.Arotary compressorsBreciprocating compressorsCcentrifugal compressorsDscrew compressors
单选题Which of the following is not information provided from an IP phone to a Catalyst switch using CDP？（）A device PoE requirementsB device IP addressC device voice VLAN IDD device platform
单选题The starting air system usually has （） to prevent starting if anything is not in order.Astop valvesBinterlocksCnon-return valvesDair vents
单选题The starting air system usually has （） to prevent starting if anything is not in order.Adrain cocksBvent valvesCcounteractsDinterlocks
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As the air passes through the charge air cooler, its temperature may be reduced and moisture condensed, with the condensate in danger of being carried into the engineSo a water separator should be mounted beneath the bottom part of the engine inlet manifoldA water separator is used in order to （）.Akeep the air from being carried into the engineBkeep the moisture from being condensedCkeep the danger from being carded into the engineDtake away the condensate from the air
单选题Water in the fuel can prevent the engine from starting, prevent it from developing full power, or （）Arun at an irregular speedBcreate high lube oil temperatureCcause the engine to over-speedDcause blue smoke in the exhaust
单选题The purpose of an air compressor unloading device is to （）Adrain water from the air receiverBdrain water from the cylindersCdelay the compression process until the motor is up to speedDcheck pump alignment
单选题During （）, the starting air valves should be closed to prevent the engine from turning.AoverhaulBrunningCblowing downDAll of the above are correct
单选题Starting air for auxiliary engines may be taken directly from the main reservoirs or through （）.Aan auxiliary reservoirBa controlling air bottleCan emergency air compressorDa main air compressor
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Explosions do occur （） caused by the ignition of oil or vapour gaining access from compressors or defective engine starting valves.Ain boiler drumsBin refrigerating plantsCin starting air pipesDin air coolers