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
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.
A
instantaneous
B
instantaneously
C
simultaneous
D
simultaneously
参考解析
解析：
暂无解析
相关考题：
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?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
题干材料：Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be impracticable to maintain ambient conditions within the comfort zone by air conditioning or any other means. The normal practice is to provide copious mechanical ventilation; in boiler rooms, the quantity is equated to the combustion requirements, while in a motor ship engine room the supply may be 25-50% in excess of the requirements of the engines.The axial flow fan is particularly suited to handle these large air volumes at the moderate pressures required, while of course the “straight-through” flow feature places it at an advantage over the centrifugal fan.The increasing adoption of automation, with the provision of a separate control room makes less significant the fact that comfort conditions cannot be maintained in the engine room all the time.问题：Which of the following devices should be taken to maintain ambient conditions of the boiler and machinery space?A.air compressorB.air coolerC.air-conditioning plantD.mechanical ventilation plantIn a motor vessel, the air quantity which the engine room need is_______ of the requirements of the engines.A.less than 25-50%B.more than 125-150%C.more than 25-50%D.less than 125-150%According to this passage, which of the following statements is true?A.In boiler and machinery spaces, there is the air conditioningB.In the boiler rooms the requirement of air volume should meet 25-50% of combustion requirementC.To maintain the comfort zone in the separate control room the air conditioning plant should be fittedD.The comfort conditions can be maintained in the engine room all the timeAt the middle pressure and large air quantity,_________ is more suitable.A.an axial flow fanB.a radial flow blowerC.a centrifugal fanD.an auxiliary blower请帮忙给出每个问题的正确答案和分析，谢谢！
In an air conditioning system, moisture is removed from the air by ______.A.filtersB.separatorsC.ducted trapsD.dehumidifiers
According to this passage, which of the following statements is true?A.In boiler and machinery spaces, there is the air conditioning.B.In the boiler rooms the requirement of air volume should meet 25-50% of combustion requirement.C.To maintain the comfort zone in the separate control room the air conditioning plant should be fitted.D.The comfort conditions can be maintained in the engine room all the time.
Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be impracticable to maintain ambient conditions within the comfort zone by air conditioning or any other means. The normal practice is to provide copious mechanical ventilation; in boiler rooms, the quantity is equated to the combustion requirements, while in a motor ship engine room the supply may be 25-50% in excess of the requirements of the engines.The axial flow fan is particularly suited to handle these large air volumes at the moderate pressures required, while of course the “straight-through” flow feature places it at an advantage over the centrifugal fan.The increasing adoption of automation, with the provision of a separate control room makes less significant the fact that comfort conditions cannot be maintained in the engine room all the time. Which of the following devices should be taken to maintain ambient conditions of the boiler and machinery space?A.air compressorB.air coolerC.air-conditioning plantD.mechanical ventilation plant
According to the passage, what is one disadvantage of skyscrapers that have mirroredwalls?__________A.The exterior surrounding air is heatedB.The building materials are very expensiveC.Construction time is increasedD.Extra air-conditioning equipment is needed
Heating，ventilating，and air conditioning（HVAC） systems are______in most of underground subway stations to provide comfortable and fresh air to underground subway stations。A.assembledB.installingC.equippedD.installed
单选题The opening or closing of the cylinder starting valve is controlled by （）.Athe starting air distributorBthe cut-off valve on the air mainCthe main starting valveDthe air bottle control valve
单选题Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be （） to maintain ambient conditions within the comfort zone by air conditioning.ApossibleBnecessaryCpracticableDimpracticable
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（）are supplied by main switchboard directly.ASuez Canal searchlight, air compressor and air conditioning compressorBAir compressor, boiler blower and refrigeration plantCBoiler blower, Suez Canal searchlight and refrigeration plantDSuez canal searchlight, air compressor and boiler blower
单选题In reference to air conditioning, when air attains the maximum amount of moisture it can hold at a specific temperature, it is said to be （）.AsuperheatedBsaturatedCcondensedDconvected
单选题Most air conditioning units have （） for adjusting the ratio of recirculated fresh airCare must be taken not to reduce the fresh air so that stuffiness or smells arise.Acatch platesBdampersCregulating valvesDfans
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
单选题（） supplies pilot air to control the cylinder air start valves.AAn air compressorBAn indicator cockCAn air distributorDA safety valve
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In extreme weather conditions, either hot or cold, control of the air conditioning plant presents （） difficulties.AfewBlittleCa littleDless
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
单选题Routine maintenance on a Central Control Room hermetically sealed air conditioning unit should include （）Achanging the air filterBrecharging the systemCchanging compressor lubricantDrenewing container vacuum
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
单选题The quantity of cooled air delivered by an air conditioning unit should （） the sum of the quantity of air re-circulated to the unit and the quantity mechanically exhausted.AbalanceBnot balanceCbe more thanDbe less than