单选题Saltwater is typically provided to a refrigeration system to （）.Acool the expansion valveBprevent refrigerant superheatingCcondense the refrigerant gasDprevent motor overheating
单选题
Saltwater is typically provided to a refrigeration system to （）.
A
cool the expansion valve
B
prevent refrigerant superheating
C
condense the refrigerant gas
D
prevent motor overheating
参考解析
解析：
暂无解析
相关考题：
Low compressor head pressure in a refrigeration system can be caused by ___.A.insufficient condenser cooling waterB.excessive condenser cooling waterC.air in the refrigeration systemD.excessive refrigerant in the system
The refrigeration system low pressure cutout switch is actuated by______.A.an electric system managerB.a sensing bulb at the tail coil of the evaporatorC.pressure changes in the suction lineD.failure of the king solenoid valve
Which of the following are functions that are often provided by an ITSP but are not typically provided by the PSTN？（）A、 QoSB、 call setup and teardownC、 call routingD、 call supervisionE、 audio signal compression
单选题Low compressor head pressure in a refrigeration system can be caused by（）.Ainsufficient condenser cooling waterBexcessive condenser cooling waterCair in the refrigeration systemDexcessive refrigerant in the system
单选题The refrigeration system low pressure cutout switch is actuated by （）.Aan electric system managerBa sensing bulb at the tail coil of the evaporatorCpressure changes in the suction lineDfailure of the king solenoid valve
单选题The latent heat of evaporation is dissipated in the （） in a compression refrigeration system.AevaporatorBcondenserCexpansion valveDcompressor
单选题In a centrifugal Freon refrigeration system, the overall capacity of the system is increased by（）Aopening more bypass linesBopening additional expansion valvesCadding refrigerantDspeeding up the machine
单选题In a refrigeration system, the refrigerant absorbs the latent heat of vaporization in the（）.AcompressorBcondenserCreceiverDevaporator
单选题When it is necessary to open a refrigeration system for repairs and the system will be open for more than a few minutes, the open ends of the system should be （）.AdehydratedBpurgedCpluggedDevacuated
单选题The function of （） in a refrigeration plant using Freon is to move moisture from all refrigeration system.AfilterBfilter drierCheat exchangerDair cooler
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Zinc rods are installed in the refrigeration system （）.Aliquid strainerBliquid receiverCsaltwater condenserDevaporator
单选题The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch， One reason for this could be the （）.Asystem is low on refrigerantBhigh pressure cutout switch is improperly adjustedCdischarge valves are leaking slightlyDdischarge valves are leaking excessively
单选题In which of the listed refrigeration system components does superheating of the refrigerant take place?（）AExpansion valveBEvaporatorCDrierDReceiver
多选题Which of the following are functions that are often provided by an ITSP but are not typically provided by the PSTN？（）AQoSBcall setup and teardownCcall routingDcall supervisionEaudio signal compression
单选题A liquid sight flow indicator in a refrigeration system is examined and gas bubbles are noted in motion with the fluid flowThis means （）.Athe system is fully chargedBthere is air leaking in from the condenserCice crystals are forming in the refrigerantDthe system contains less than a full charge of refrigerant
单选题Which of the following statements is correct concerning a typical shipboard multi-coil refrigeration system?（）AThe liquid receiver functions to collect and remove non-condensable gasesBA thermostatic expansion valve is used to control refrigerated space temperatureCRefrigerant temperature in an evaporator is directly related to refrigerant pressureDDehydrators must be used continuously in a refrigeration system
单选题Refrigerant is circulated through a refrigeration system by the （）.AcompressorBcondenserCexpansion valveDevaporator
单选题The refrigerant leaves the evaporator of a refrigeration system as a low pressure （）.Asub-cooled liquidBhigh temperature liquidCoil saturated liquidDsuperheated vapor
单选题Moisture in a refrigeration system can cause （）.Afreezing the expansion valve closedBcorrosion of system pipingCimproper temperature regulationDall of the above
单选题Under normal conditions, the refrigerant enters the compressor in an operating refrigeration system as a （）.AliquidBdry saturated gasCwet saturated gasDsuperheated vapor
单选题Which of the listed statements is correct concerning refrigeration systems?（）ADehydrators must be used continuously in a refrigeration systemBA 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hoursCA thermostatic expansion valve is used to control refrigerated space temperatureDThe liquid receiver functions to collect and remove non- condensable gases
单选题Which of the listed refrigeration system components keeps the refrigerant circulating through the system?（）AExpansion valveBCondenserCEvaporatorDCompressor
单选题A faulty thermostatic bypass valve, in a diesel engine cooling system, can result in （）Aexcessive time required for warming-upBexcessive freshwater corrosionCscale formation on the saltwater sideDsaltwater mixing with the freshwater