单选题Air line lubricators are used in compressed air systems to lubricate （）.Athe suction and discharge valvesBtools and equipment served by compressed airCair line reducing valvesDall of the above
单选题
Air line lubricators are used in compressed air systems to lubricate （）.
A
the suction and discharge valves
B
tools and equipment served by compressed air
C
air line reducing valves
D
all of the above
参考解析
解析：
暂无解析
相关考题：
The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by_______.A.large conical springsB.compressed air pressureC.hydraulic pressureD.exhaust gas pressure
Restrictions occurring in the small orifices(孔) of pneumatic control system components can be caused by ______.A.moisture in the compressed air supplyB.excessive dryness in the compressed air supplyC.pressure surging in the compressed air receiverD.insufficient lubrication of the system components
What is the function of an air receiver in the compressed air system on a ship?A.Condenses moistureB.Provides overpressure protectionC.Purifies the airD.Acts as an accumulator
Which cleaning product should be used for the inside of a computer？（）A、glass cleanerB、a simple ammonia and water solution followed by an antistatic solutionC、a bleach solution followed by waterD、compressed air
A technician is tasked with clearing all dust covering the fan vents of servers in a small office.Which of the following tools would be the BEST option?（）A、Small vacuumB、Air compressorC、Compressed air canD、Paint brush
单选题The fresh air coming in through the inner air ports, is compressed by（） to a higher pressure.Athe cylinder headBthe cross-headCthe moving pistonDthe stationary piston
单选题Which of the following statements describes the function of an air compressor intake filter?（）AProtects against suction valve floatBProvides a positive pressure on the air inlet valvesCPrevents lubricating oil contamination of the compressed air supplyDProtects against the damaging effects of airborne solid particles
单选题What is the function of an air receiver in the compressed air system on a ship? （）ACondenses moistureBProvides overpressure protectionCPurifies the airDActs as an accumulator
单选题Clean air standards referred to as “Grade D” apply to compressed air for use in（）.Ahigh pressure fluid accumulatorsBdriving air-powered plunger pumpsCfilling open-circuit breathing systemsDbladder-type accumulators
单选题When used in conjunction with a turbocharger, the main function of an after-cooler is to （）Aincrease the density of the cylinder air chargeBprevent turbocharger overheatingCliminate the need for a pre-coolerDremove moisture from air compressed by the turbocharger
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Restrictions occurring in the small orifices of pneumatic control system components can be used by （）Amoisture in the compressed air supplyBexcessive dryness in the compressed air supplyCpressure surging in the compressed air receiverDinsufficient lubrication of the system components
单选题Broken valve strips in an operating low pressure, air compressor will cause （）.Aan immediate crankcase explosionBoil contamination in the compressed airCa decrease in compressor capacityDno immediate loss of the compressed air capacity
单选题Increased air （） will raise scavenge efficiency and allow a greater mass of air to be compressed； more fuel may now be burned giving an increased power.Aspecific volumeBdensityCviscosityDcalorific value
单选题Compressed air is supplied by air compression to （）.Athe air receiversBthe starting valvesCthe cylinder coversDthe distributors
单选题The compressed air is supplied by （） to the air reservoirs.AcompressorsBforced fansCventilatorsDgenerators
单选题Compressed air is used on board ship （）.Afor starting diesel enginesBin pneumatic control systemCin pneumatic toolsDAll the above are true
单选题The primary task of the compressed air system is to deliver the starting air necessary for （）Astarting the MEBstarting the emergency electric alternatorCdriving the main turbineDdriving the turbocharger
单选题With ducted air conditioning systems, the modern tendency is to use（）Acentral air conditioning systemBhigh velocity systemClow velocity systemDsingle duct system
单选题If an air compressor is used to supply compressed air to outlets throughout the engine room and on deck of a vessel, the system is known as the （）.Acombustion control air systemBsupply air systemCships service air systemDlow pressure deck air system
单选题Compressed air is used on board ship for all the following purposes except （）.Astarting diesel enginesBpneumatic control systemsCpneumatic toolsDsupercharging air
单选题Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger?（）AReduce engine speed to idle before removing the filterBSoak the dirty filter in kerosene onlyCBlow out the air inlet with compressed airDCover the air inlet after removing the filter
单选题请阅读 Passage 1，完成第 21~25小题。Passage 1These days，many large city buildings are equipped with their own air-conditioning systems.These systems help keep the buildings cool，but they can also damage the environment.Since they use a lot of electricity，for instance，they contribute indirectly to global warming.In addition，the water that flows through the systems is often cooled using chemicals called chlorofluorocarbons，or CFCs，that are believed to damage the Earth's ozone layer.Recently，though，a system has been built in the city of Toronto，Canada，that cools buildings with little damage to the environment. In the traditional air-conditioning systems found in most large buildings，water is pumped through the building in a continuous cycle.The water is first cooled to a temperature of 4℃ in machines called chillers.It is then sent to individual units that cool the air in each room.As the water flows through the building，it gradually becomes warmer.Finally，it reaches the roof ，where it is left to cool down naturally in a water tower.After that it is returned to the chillers，where the cycle begins again.Toronto lies on the shore of Lake Ontario，one of North America's Great Lakes，and the new system makes use of cold water taken from about 80 meters below the surface of the lake.At this depth，the water in the lake remains at 4℃ all year round.This is exactly the temperature to which the water in air-conditioning systems is cooled.However，the water from the lake is not pumped directly into the air-conditioning systems.Instead，it is used to cool the water that is already inside the air-conditioning systems.After that，the lake water is added to the city's ordinary water supply.Enwave，the company that developed this deep-lake cooling system，says that it uses 75 percent less energy than traditional air conditioning.And since no CFCs are used，no damage can be caused to the ozone layer.Not every city is located next to a large lake，but experts believe that systems like the one being used in Toronto could be built elsewhere by using other natural sources of cold water.What happens in the end to the water from Lake Ontario?AIt is used by the residents of Toronto.BIt is returned to a place deep in the lake.CIt is cooled down before being used again.DIt is added to the water inside air-conditioning systems.
单选题Which of the listed precautions should be taken when cleaning the internals of a motor with compressed air?（）AOpen the machine on both ends so as to allow the air and dust to escapeBBe certain that the circuit breaker is opened and tagged on the feeder panelCBe certain that the air is clean and as dry as possibleDAll of the above
单选题Air compressor cylinder un-loaders enable the compressor to （）.Avary their speed according to temperature and loadBstart and come up to speed before air compression beginsCchange speed according to overload demandsDreduce compressed air charge density
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If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the （）.Acontrol air systemBforced draft air systemCsupply air systemDships service air system