单选题The main distribution duct in an air conditioning system which contains the cooling coils and filters is called the()AmanifoldBcondenserCchamberDplenum
单选题
The main distribution duct in an air conditioning system which contains the cooling coils and filters is called the()
A
manifold
B
condenser
C
chamber
D
plenum
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In order to achieve greater dehumidification with an air conditioning system, you should ____.Ⅰ.reduce the cooling coil Ⅱ.temperature increase the re-heater temperatureA.ⅠonlyB.ⅡonlyC.BothⅠandⅡD.NeitherⅠnorⅡ
Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?A.Cooling the air to a temperature just above dew pointB.Heating the air to a point at which moisture will boil off ,then re-cooling itC.Cooling the air to a point below dew point, then reheating itD.Heating the air and then cooling it to a point below dew point
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单选题In order to achieve greater dehumidification with an air conditioning system, you should () Ⅰ.reduce the cooling coil Ⅱ.temperature increase the re-heater temperatureAⅠonlyBⅡ onlyCBothⅠandⅡDNeitherⅠnorⅡ
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If plastic film insulation becomes damaged in air conditioning system, () may form within the film.AevaporationBcondensationCliquefiesDvaporization
单选题In an air conditioning system, low head pressure associated with a reciprocating compressor can be the result of ()Abroken valve springsBtight drive beltsChigh line voltageDair in the 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A re-heater, as used in an air conditioning system, is designed to control the ()Achilled water temperatureBdew point temperatureCprimary air temperatureDdry bulb temperature
单选题For the proper control of the air temperature in an air conditioning system using chilled water circulation, which of the listed conditions should remain constant regardless of load changes?()AChilled water system supply temperatureBChilled water system return temperatureCCompressor discharge temperatureDCompressor suction pressure
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 is the function of the chillers in a traditional air-conditioning system?AThey pump the air continuously to the units in each room.BThey lower the temperature of the water in the system.CThey help the water cool down naturally on the roof .DThey gradually clean the water as it flows through the building.
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单选题Which of the fluids listed is normally used to condense the primary refrigerant in a shipboard central air conditioning system?()AAir or NitrogenBSeawater or Fresh waterCSodium Nitrate brineDCalcium Sulfate brine
单选题Air conditioning is the process of treating air to control () its temperature, humidity, cleanliness and distribution to meet the comfort requirements of the occupants of the conditioned space.AinstantaneousBinstantaneouslyCsimultaneousDsimultaneously
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单选题With ducted air conditioning systems, the modern tendency is to use()Acentral air conditioning systemBhigh velocity systemClow velocity systemDsingle duct system
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单选题To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the ().Adischarge service valve as a vaporBsuction service valve as a liquidCcharging valve as a liquidDcondenser purge valve as a vapor
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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Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?()ACooling the air to a temperature just above dew pointBHeating the air to a point at which moisture will boil off ,then re-cooling itCCooling the air to a point below dew point, then reheating itDHeating the air and then cooling it to a point below dew point