【判断题】Lesson 15 Text A Tor F-1 ADSB originates from Next Gen Air Transportation System and will be applied to air traffic managementA．Y.是B．N.否
【判断题】Lesson 15 Text A Tor F-1 ADSB originates from Next Gen Air Transportation System and will be applied to air traffic management
A．Y.是
B．N.否
参考答案和解析
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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
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
In an air conditioning system, moisture is removed from the air by ______.A.filtersB.separatorsC.ducted trapsD.dehumidifiers
Working conditions in air transportation vary widely, _______ on the occupation.A.depends B.dependable C.depending D.depend
A cool mass of air heads toward the United States from the upper regions of Canada and Alaska this week according to the National Weather Service.According to the NWS a mass of cold air will drop from the Arctic regions to Canada and then the upper Midwest next week.Temperatures across the Midwest will drop into the 60s and 70s-a sharp difference from the 80 degree and 90 degree temperatures from recent weeks. And the relatively cooler air may be felt as far East as New York and WashingtonThe cool breezes may be a welcome relief this time around but remember the last few times we got hit with Arctic air？Temperatures in cities including Chicago Cleveland New York and Louisville fell into single-digit and negative territory for long stretches during the harsh winter months of early 2014. But we’re sure you rememberAccording to the National Weather Service____A. the cool mass of air originates from CanadaB. a mass of cold air will affect both Canada and the U.SC. the chilly weather is back to the globeD. only the upper Midwest will be affected by the cool air
资料：We never thought we'd say this, but we'd welcome back some chilly weather.A cool mass of air heads toward the United States from the upper regions of Canada and Alaska this week, according to the National Weather Service.According to the NWS, a mass of cold air will drop from the Arctic regions to Canada and then the upper Midwest next week.Temperatures across the Midwest will drop into the 60s and 70s—a sharp difference from the 80 degree and 90 degree temperatures from recent weeks. And the relatively cooler air may be felt as far East as New York and Washington.The cool breezes may be a welcome relief this time around, but remember the last few times we got hit with Arctic air?Temperatures in cities including Chicago, Cleveland, New York, and Louisville fell into single-digit and negative territory for long stretches during the harsh winter months of early 2014. But we're sure you remember.According to the National Weather Service, ___.A.the cool mass of air originates from CanadaB.a mass of cold air will affect both Canada and the U.S.C.the chilly weather is back to the globeD.only the upper Midwest will be affected by the cool air
（） is a system of unitized multimodal land transportation of transport by road and rail.A、Land bridgeB、Rail/roadC、PiggybackD、Sea/air
The modes of transportation include（）。A、rail and road transportB、water transportC、pipelinesD、air transport
ATA100中ATA是什么的缩写？A、Air Transport AssociationB、Air Training AssociationC、Air Traffic Association
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Air blowing from the intake air filter of an operating air compressor indicates （）.Abroken inlet valvesBbroken discharge valvesCpulsations in the air distribution systemDoverloading of the air distribution system
单选题In an air conditioning system, moisture is removed from the air by（）AfilersBseparatorsCducted trapsDdehumidifiers
单选题A re-heater in an air conditioning system functions to （）.Acontrol inlet air temperatureBcontrol inlet air volumeCmaintain relative humidity at 15%Drestore conditioned air temperature to a comfortable level
单选题Air or noncondensable gas is removed from a refrigeration system by a （）Aseparating chamberBsystem of bafflesCpurge valveDvacuum reducing valve
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Air cocks, usually positioned at the （） in a circulating system, is used to get rid of the air in the system.Abending jointBexpansion tankCweldDthe highest point
单选题Diesel engine air start system check valves are opened by （）Aan air start camBcylinder compression pressureCstarting air pressureDvalve springs
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Which of the following methods is normally used to control the temperature of air distributed from individual cooling coils in an air conditioning system using a chilled water circulation system?（）AA room thermostat activates an electric heater at each individual chilled air outlet when necessaryBVarying the number of passes the air makes across the coilsCVarying the temperature of the water through the coilsDVarying the quantity of water flowing through the coils
判断题In international air cargo transportation， Specific Commodity Rates are usually lower than General Cargo Rates.A对B错
单选题To prevent the unnecessary loading of an air conditioning system while maintaining the designed dry bulb temperature and relative humidity in an air conditioning system, you should （）Aadmit only enough fresh outside air to provide proper ventilationBreduce the air reheating system loadClower the compressor head pressureDoperate the purge recovery unit continuously
单选题Which of the following statements describes the functions of a reservoir used in a hydraulic system?（）ADissipate heatBTrap foreign matterCSeparate air from the oilDAll of the above
单选题Pump up the starting air reservoirs to their maximum pressure and （）the air reservoirs and air system.AopenBcloseCdrainDvent
单选题A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）Apurge lube oil from the liquid refrigerantBrecover water purged from the systemCseparate foul gases from the receiverDpurge non-condensable gases without losing refrigerant
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