单选题“Flooding back” is a condition where the liquid refrigerant ().Avaporizes in the condenserBreaches the compressor through the suction lineCflashes in the liquid lineDcondenses in the receiver

单选题
“Flooding back” is a condition where the liquid refrigerant ().
A

vaporizes in the condenser

B

reaches the compressor through the suction line

C

flashes in the liquid line

D

condenses in the receiver


参考解析

解析: 暂无解析

相关考题:

To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the_______ .A.suction service valve as a vaporB.suction service valve as a liquidC.discharge service valve as a vaporD.charging valve as a liquid

If the superheat value of a thermostatic expansion valve is set too low, the _.A.the suction line will be abnormally cold and liquid may slug back to the compressorB.the suction line will be hot due to a reduced amount of refrigerant returning to the compressorC.the temperature of the refrigerant within the condenser will remain the sameD.the temperature of the refrigerant passing through the sub-cooler will decrease

单选题A positive displacement pump is that where the volume of the pump chamber is alternately increased to () and then decreased to ().Adraw the liquid in;force the liquid outBforce the liquid out;draw the liquid inCsuction;drawDdeliver;outlet

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Foaming of the oil in a refrigeration compressor crankcase is caused by ().Arefrigerant boiling out of solution from the lube oilBliquid refrigerant flooding the compressor and systemClube oil viscosity being reduced by refrigerant dilutionDcompressor suction pressure suddenly increasing

多选题Which three are true regarding the use of outer joins? ()AYou cannot use IN operator in a condition that involves an outerjoin.BYou use (+) on both sides of the WHERE condition to perform an outerjoin.CYou use (*) on both sides of the WHERE condition to perform an outerjoin.DYou use an outerjoin to see only the rows that do not meet the join condition.EIn the WHERE condition, you use (+) following the name of the column in the table without matching rows, to perform an outerjoin.FYou cannot link a condition that is involved in an outerjoin to another condition by using the OR operator.

单选题In a compression refrigeration cycle, the temperature of the liquid refrigerant experiences its greatest decrease in the().AevaporatorBcompressorCexpansion valveDcondenser

单选题Moisture in the refrigerant may ().Afreeze on the expansion valve seat and reduce the flow of liquid refrigerantBemulsify the oil in the condenserCfreeze in the king valveDclog the oil trap

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Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?()AAt the designed operating temperature, the liquid refrigerant charge has changed to a vaporBThe liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivityCThe sensing bulb is empty of liquid refrigerant charge at the designed operating temperatureDThe sensing bulb is never emptied of liquid refrigerant under normal operating conditions

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The principal purpose of sub-cooling liquid refrigerant prior to its entering the expansion valve is to ().Aincrease the refrigerating effect, by decreasing the amount of flash gasBallow the refrigerant to enter the throttling device in a saturated conditionCincrease the refrigerating effect by increasing the amount of flash gasDminimize the temperature drop of the liquid as it passes through the solenoid valve to the outlet side

单选题Sub-cooling is a method of reducing the temperature of the liquid refrigerant below its ().Afreezing pointBfloc pointCcondensing temperatureDcompression temperature

单选题Of a kind of liquid is used to cool the diesel engine, it is invariably called ()AlubricantBcoolantCcombustion productDsecond refrigerant

单选题To correct the condition of slugging and flooding back in a refrigeration system, it may be necessary to ().Are-adjust the discharge pressureBclean the expansion valve screenCadd refrigerantDadjust the expansion valve

单选题If liquid refrigerant accidentally comes in contact with the eyes, () immediately.Arub the eyesBirritate the eyesCwash the eyes with a heavy boric acid solutionDobtain medical help

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