单选题A sight glass is installed in the liquid line to indicate the condition of the refrigerant charge and may also indicate the （）.Acondition of the expansion valveBmoisture in the systemCcondition of the compressor suction valvesDcondenser temperature
单选题
A sight glass is installed in the liquid line to indicate the condition of the refrigerant charge and may also indicate the （）.
A
condition of the expansion valve
B
moisture in the system
C
condition of the compressor suction valves
D
condenser temperature
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Some refrigeration systems have chemical moisture indicators installed in conjunction with the sight glass in the liquid line If excess moisture is present in the system, the indicator willA.activate the driersB.change colorC.secure the compressorD.add a predetermined amount of liquid drier
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单选题Some refrigeration systems have chemical moisture indicators installed in conjunction with the sight glass in the liquid lineIf excess moisture is present in the system, the indicator will （）Aactivate the driersBchange colorCsecure the compressorDadd a predetermined amount of liquid drier
单选题The device, which is installed in the compressor suction line to prevent liquid from entering the compressor when hot gas defrosting, is called a（）Are-evaporatorBreceiverCdehydratorDsolenoid
单选题Which of the problems listed could be indicated if a sight glass in the refrigerant liquid line is full of bubbles?（）AProper refrigerant chargeBFaulty expansion valveCInsufficient refrigerantDSolenoid valve stuck open
单选题When liquid reaches the compressor of a refrigeration system through the suction line, the condition is called （）.Aflooding backBsuperheatingCoverflowingDrecycling
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Before liquid can flow into a pump, the air in the suction line must be （） sufficiently to cause the liquid to flow into the suction chamber.AfilledBevacuatedCcompressedDcharged
单选题A star is observed at lower transit. The line of position derived from this sight is（）.Aon the prime verticalBa latitude lineCa longitude lineDof no special significance
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Areas enclosed by a long and short dashed magenta line indicate （）.Acable areasBdumping groundsCfish trap areasDprecautionary areas
单选题Air entering an air-cooled refrigeration system is indicated by （）.Afrosting of the liquid lineBhigher than normal head pressureCa clear sight glassDabnormally cold reefer boxes
单选题A pressure drop through the refrigerant liquid line may cause （）.Asolenoid valve to seizeBcompressor to huntCformation of flash gas in the liquid lineDexpansion valve to freeze open
单选题The height of eye correction is smaller than geometrical dip because of （）.Athe angle between the horizontal and the line of sight to the visible horizonBindex errorCparallaxDterrestrial refraction
单选题In the refrigeration system, a shortage of refrigerant is indicated by （）.Athe compressor short cycling on high pressure cut out switchBhigh suction pressureChigh head pressureDbubbles in the sight glass
单选题A liquid indicator sight glass is useful in determining whether or not a refrigeration system is sufficiently chargedIt is generally located in the（）.Ahigh pressure liquid lineBlow pressure liquid lineChigh pressure vapor lineDlow pressure vapor line
单选题The static suction head of is the （）Adistance of the suction liquid level above the line of the pumpBdistance the suction liquid level is below the center line of the pumpCforce necessary to overcome frictional losses in the pump and pipingDamount in inches of mercury the total suction head is below atmospheric pressure
单选题A pressure drop in the liquid line of a refrigeration system may cause（）Athe solenoid valve to seizeBthe compressor to huntCflash gas to form in the liquid lineDthe expansion valve to freeze open
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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