单选题The temperature of the refrigerant in the evaporator coil depends mostly upon the ().Arefrigerant pressure in the evaporatorBcooling water temperature to the condenserCheat load in the refrigerator compartmentDsolenoid valve in the liquid line

单选题
The temperature of the refrigerant in the evaporator coil depends mostly upon the ().
A

refrigerant pressure in the evaporator

B

cooling water temperature to the condenser

C

heat load in the refrigerator compartment

D

solenoid valve in the liquid line


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The temperature of the refrigerant in the evaporator coil depends mostly upon the ___.A.refrigerant pressure in the evaporatorB.cooling water temperature to the condenserC.heat load in the refrigerator compartmentD.solenoid valve in the liquid line

A thermostatic expansion valve is properly controlling evaporator superheat. Adjusting this valve to lower the superheat will result in a/anA.evaporator pressure decreaseB.evaporator coil over-feedC.evaporator capacity increaseD.expansion valve diaphragm rupture

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

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When the temperature of the refrigerant flowing out from the condenser is below the condensing temperature, it is said to be ().AdryBwetCsuper-cooledDsuperheated

单选题A refrigerant boils and vaporizes in the () in a compression refrigeration system.Aliquid receiverBcompressorCcondenserDcooling coil

单选题The refrigerant flows through the evaporator, where it () heat from the refrigerated space.AextractsBreleasesCgives noDabsorbs no

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The heat gained per pound of refrigerant in the evaporator is known as the().Alatent heat of vaporizationBsensible heatCrefrigerating effectDspecific heat of vaporization

单选题The bulb for the thermal expansion valve is located()Ain the middle of evaporator coilsBnear the evaporator coil outletCnear the evaporator coil inletDon the bottom row of evaporator coils

单选题Because the expansion valve is just () way open, the refrigerant is under low pressure in the evaporator.AlittleBfewCa littleDa few

单选题The saturation temperature of the refrigerant must be () that required in the evaporator refrigerated space.AaboveBbelowCequal toDNone of the above

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A refrigerant gives up heat when it goes through ().AcondenserBregurgitateCevaporatorDboil coil

单选题A refrigerant with oil in solution has a ().Ahigher boiling temperature for a given pressure than does a pure refrigerantBlower boiling temperature for a given pressure than does a pure refrigerantCboiling pressure equal to that of a pure refrigerant at a given pressureDboiling point will not be affected by entrained oil

单选题In terms of pressure and temperature in the refrigerant in the compressor, what happens to the primary?()Aits pressure and temperature are both loweredBits pressure and temperature are both raisedCits pressure is lowered and its temperature is raisedDits pressure is raised and its temperature is lowered

单选题Both the temperature and the pressure of the refrigerant are increased in the ().AcompressorBcondenserCevaporatorDexpansion valve

单选题The thermal expansion valve reacts directly to the ()Atemperature in the space being cooledBliquid refrigerant pressure at the solenoid valveCpressure drop across the evaporator coilsDrefrigerant gas superheat at the coil outlet

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The refrigerating agent can () at low temperature in the evaporator.AexpandBevaporateCcondenseDdistil

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单选题In practice, the refrigerant flow after the evaporator is designed to ensure that the vapor leaving the evaporator is slightly ().AsaturatedBsuper-cooledCwetDsuperheated

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Constant superheat is maintained at the evaporator outlet of a refrigeration coil by a()Asolenoid valveBlow pressure cutout switchCking valveDthermal expansion valve

单选题If the compressor-discharge temperature is higher than the receiver temperature()Aincrease the amount of cooling water to the condenserBdecrease the amount of cooling water to the condenserCadd more refrigerant to the systemDremove some of the refrigerant from the system

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