网友您好, 请在下方输入框内输入要搜索的题目:

题目内容 (请给出正确答案)
单选题
The () stage air compressors are widely used on board the ship.
A

single

B

C

D

multiple


参考答案

参考解析
解析: 暂无解析
更多 “单选题The () stage air compressors are widely used on board the ship.A singleB ⅡC ⅢD multiple” 相关考题
考题 Regional dialects are used most widely in a community.()

考题 At board meetings you have to _____the formality of the language. A.used toB.be used to learnC.get used toD.be used as

考题 _____ are widely used in the current world.A、The computersB、ComputersC、A computerD、An computer

考题 what is “board sling” used for?

考题 Compressed air is supplied by air compressors to______.A.the air receiversB.the starting valvesC.the cylinder coversD.the distributors

考题 Working conditions in air transportation vary widely, _______ on the occupation.A.depends B.dependable C.depending D.depend

考题 单选题Hot gas defrosting uses the hot gas from () to defrost the evaporator.A starting air bottlesB diesel enginesC boilersD refrigeration compressors

考题 单选题By far the greatest use is for diesel engine starting using air pressure of 25 bar or more provided by ().A rotary compressorsB reciprocating compressorsC centrifugal compressorsD screw compressors

考题 单选题Condensate must be drained periodically from the air compressor receivers to prevent ().A second stage cylinder lockupB oil sump contaminationC faulty operation of pneumatic valvesD corrosion of air receiver baffles

考题 单选题Condensate must be drained from the intercooler and after-coolers of an air compressor because ().A the cooling effect of the condensate reduces the compressors efficiencyB a danger of explosion exists whenever water is present in a compressorC water causes erratic operation of pneumatic componentsD the volumetric capacity of the first stage is reduced if water remains

考题 单选题To obtain maximum efficiency, two stage air compressors are usually ().A horizontally mountedB never fitted with intake filtersC fitted with intercoolersD operated in an unloaded condition at all times

考题 单选题Intercoolers installed on starting air compressors, reduce the possibility of()A dust entering the high pressure stageB lube oil carbonizationC discharge pulsationsD inter-stage vapor lock

考题 单选题In the operation of a flash type evaporator equipped with air ejectors,the air and non- condensable gases are evacuated directly from the ().A first stage flash chamberB second stage flash chamberC first stage after condenserD second stage distilling condenser

考题 单选题Which of the following statements is true concerning the overall efficiency of air compressors?()A High pressure compressors are more efficient than low pressure compressorsB Mechanical efficiency divided by compressor efficiency will equal the overall efficiency of the compressor unitC Two stage compressors are generally more efficient than single stage compressorsD The volumetric efficiency is decreased in multistage compressors

考题 单选题On board supply vessels, a centrifuge is normally used to purify()A cooling waterB fuel oilC sea waterD diesel intake air

考题 单选题On small, low pressure, air compressors, the cylinders are usually lubricated by the ().A splash methodB mechanical force feed lubricatorsC detached sump methodD internal cooling passages in the crankshafts and connecting rods

考题 单选题(), so they are widely used on board ship nowadays.A Diesel engines have more advantages in comparison with gasoline enginesB Diesel engines have more advantages in comparison to gasoline enginesC Gasoline engines have more advantages in comparison with diesel enginesD Gasoline engines have more advantages in comparison to diesel engines

考题 单选题In order to distribute the side pressures over a wide area of the cylinder walls and liners, which of the listed types of pistons are used in modem low pressure air compressors?()A DifferentialB TrunkC BarrelD Valve-in-head

考题 单选题Compressed air is used on board ship ().A for starting diesel enginesB in pneumatic control systemC in pneumatic toolsD All the above are true

考题 单选题Compressed air is used on board ship for all the following purposes except ().A starting diesel enginesB pneumatic control systemsC pneumatic toolsD supercharging air

考题 单选题An un-loader is installed on an air compressor to ().A bypass the high pressure stage to the low pressure stage on 100% of the air compressors in serviceB prevent excessive inter-stage pressure buildupC control compressor discharge pressureD remove all but the frictional load during starting

考题 单选题Bad valves operation of the reciprocating air compressors can be detected by observation of ().A the discharge temperature lowB the discharge temperature highC the discharge pressure riseD the inter-stage pressure low

考题 单选题Adequate attention must be given to the water cooling system of the air compressors, for () can cause condensation on the cylinder walls.A overcoolingB poor coolingC overloadingD unloading

考题 单选题Usually, emergency electricity supplies to on board()A Cargo winchB WindlassC Steering gearD Main air compressor

考题 单选题The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that()A one valve seats upwards, while the other seats downwardsB the reed valves used on the discharge are made substantially thicker and heavier than the suction valvesC the suction valve springs exert a greater tension than the discharge valve springsD the discharge valve springs exert a greater tension than the suction valve springs

考题 单选题By far the greatest item of maintenance of the reciprocating air compressors concerns ().A the lubricationB the coolingC the moisture separationD the valves

考题 单选题Explosions do occur () caused by the ignition of oil or vapour gaining access from compressors or defective engine starting valves.A in boiler drumsB in refrigerating plantsC in starting air pipesD in air coolers