单选题In an operating refrigeration system low on refrigerant, a liquid line sight glass will()Abe clearBbe blueCbe light greenDshow bubbles
单选题
In an operating refrigeration system low on refrigerant, a liquid line sight glass will()
A
be clear
B
be blue
C
be light green
D
show bubbles
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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
Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause______.A.carbon deposits on the compressor suction valvesB.the evaporator temperature to increaseC.rapid corrosion of the thermal expansion valveD.no operating problems
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A refrigerant boils and vaporizes in the () in a compression refrigeration system.Aliquid receiverBcompressorCcondenserDcooling coil
单选题A refrigeration system compressor crankcase is sweating or unusually coldThis is an indication of().Aa shortage of refrigerant in the systemBair in the systemCan accumulation of liquid refrigerant in the crankcaseDa shortage of oil in the crankcase
单选题In an operating refrigeration system low on refrigerant, a liquid line sight glass will()Abe clearBbe blueCbe light greenDshow bubbles
单选题In a compression refrigeration plant the refrigerant is under low pressure in the () and under high pressure in the ().Acompressor;condenserBcondenser;evaporatorCthrottle valve;evaporatorDevaporator;condenser
单选题An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by ().Arestriction in refrigerant pipingBair and non-condensable gases in the condenserCwater in the refrigerantDflooding back of liquid refrigerant from the evaporator
单选题In a refrigeration system, the refrigerant absorbs the latent heat of vaporization in the().AcompressorBcondenserCreceiverDevaporator
单选题If a refrigeration system were short of refrigerant, the condition would result in ().Acontinuous running of the compressorBhigh suction pressureChigh discharge pressureDshort cycling of the compressor on the water failure switch
单选题Refrigerant is normally sub-cooled in a refrigeration or air conditioning system condenser to ().Amaintain adequate coil back pressureBprohibit flashing in the liquid lineCreduce refrigerant volume in the systemDreduce compressor discharge line loading
单选题If a liquid sight flow indicator in a refrigeration system shows gas bubbles in motion passing inside of the glass, there is ().Atoo much refrigerant in the systemBoil entrained in the refrigerantCless than a full charge of refrigerant in the systemDice crystals forming in the refrigerant
单选题Moisture is removed from a refrigeration system by().Ableeding refrigerant from the condenserBopening a drain petcock on the oil separatorCcondensing the water in the heat exchangerDusing a dehydrator cartridge
单选题The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by ().Apassing it through the expansion valveBcondensing refrigerant in the system condenserCpassing the gaseous refrigerant through the heat interchanger on the suction side of the compressorDmaintaining a high pressure on the systems receiver
单选题In which of the listed refrigeration system components does superheating of the refrigerant take place?()AExpansion valveBEvaporatorCDrierDReceiver
单选题Refrigerant is circulated through a refrigeration system by the ().AcompressorBcondenserCexpansion valveDevaporator
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One cause of high head pressure occurring in a refrigeration system can be ().Ainsufficient cooling water flow to the condenserBa low refrigerant charge in the systemCthe liquid valve is open too muchDhigh evaporator superheat
单选题Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?()ASub-cooled liquidBSub-cooled vaporCSuperheated vaporDLiquid
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To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the ()Asuction service valve as a vaporBsuction service valve as a liquidCdischarge service valve as a vaporDcharging valve as a liquid
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Sweating of the refrigeration system compressor crankcase is caused by ().Atoo much superheatBinsufficient superheatCsuction pressure too lowDexcessive refrigerant returning to the compressor
单选题While troubleshooting a refrigeration system for low head pressure, liquid refrigerant flooding back from the evaporator is determined to be the causeIt may be necessary to ().Achange the expansion valve adjustmentBreadjust the water regulating valve to increase the flow of waterCpurge air from the condenserDclean the waterside of the condenser
单选题When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should ().Aincrease the amount of cooling water to the condenserBdecrease the amount of cooling water to the condenserCadd more refrigerant to the systemDremove some refrigerant from the system
单选题Which of the listed refrigeration system components keeps the refrigerant circulating through the system?()AExpansion valveBCondenserCEvaporatorDCompressor
单选题The presence of bubbles in a refrigeration system liquid line may ().Apromote refrigerant dehydrationBbe absorbed in the receiverCcause low condensing pressureDcarry moisture and lead to corrosion
单选题Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause ().Acarbon deposits on the compressor suction valvesBthe evaporator temperature to increaseCrapid corrosion of the thermal expansion valveDno operating problems