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
The bulb for the thermal expansion valve is located（）
A
in the middle of evaporator coils
B
near the evaporator coil outlet
C
near the evaporator coil inlet
D
on the bottom row of evaporator coils
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相关考题：
When replacing a thermostatic expansion valve sensing bulb, it is necessary toA.apply a light film of oil to increase heat transferB.apply a light film of oil to prevent oxidationC.apply a heavy coating of grease to function as a heat sinkD.carefully coat the device with silicone sealant to reduce the effects of convective cooling
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
单选题The thermal expansion valve controls the amount of refrigerant that is allowed to flow to the （）.AcompressorBcooling coilsCcondenserDreceiver
单选题If a refrigeration system compressor crankcase is sweating, you should （）.Aadd refrigerant to the systemBadjust the thermal expansion valve to the proper settingCadjust the float valve to the proper holding pressureDopen the hand expansion valve
单选题A ruptured diaphragm in a thermostatic expansion valve will cause the valve to （）.AopenBcloseCremain in its positionDflood the evaporator with refrigerant
单选题Aluminum pistons have （） coefficient of thermal expansion compared with those of cast iron.AhigherBlowerCthe sameDnone of the above
单选题Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?（）ALube oil passing through the systemBMoisture or foreign matter collecting at the valve seat and orificeCVariable spring tension caused by the changing temperatureDFrost on the liquid line
单选题The scale trap is located between the （）Aking valve and the expansion valveBsolenoid valve and expansion valveCevaporator and receiverDcompressor and evaporator
单选题What is the function of thermostatic expansion valve in a compression refrigeration system?（）AnonexistentBfor controlling pressureCfor controlling superheatDfor controlling the solenoid valve
单选题When a refrigeration compressor is in the ‘off’ cycle, the thermal expansion valve will（）.Aalways be wide open when the compressor restartsBcontinue to operate as if the system were in operationCremain open until evaporator pressure equalizes, then close until the compressor restartsDalways be completely closed until the compressor restarts
单选题What separate the high pressure side from the low pressure side in a refrigeration system?（）ACondenser and thermal expansion valveBKing and solenoid valvesCCompressor and thermal expansion valveDCondenser and solenoid 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A thermostatic expansion valve is properly controlling evaporator superheatAdjusting this valve to lower the superheat will result in a/an （）.Aevaporator pressure decreaseBevaporator coil over-feedCevaporator capacity increaseDexpansion valve diaphragm rupture
单选题（） pistons have low inertia and high coefficient of thermal expansion.ACast ironBCast steelCForged steelDAluminum
单选题When the heat load begins to increase, the needle valve of an expansion valve will（）Amove in an opening directionBmove in a closing directionCeither open or closeDnot move at all
单选题A solenoid valve used in a refrigeration system should be installed （）.Awith the axis of the solenoid horizontal, sensing temperature of the box, and upstream of the thermal expansion valveBupright, sensing temperature of the box, and upstream of the thermal expansion valveCupright, sensing temperature of the box, and downstream of the thermal expansion valveDupright, sensing heat of the tail coil, and upstream of the thermal expansion valve
单选题A cracked diaphragm in a thermostatic expansion valve will cause the valve to （）.Areturn to a neutral positionBflood the evaporatorCopenDclose
单选题If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.Aincrease the capacity of the coilBincrease the superheat at the bulbCdeliver more refrigerant to the coilDdecrease the capacity of the coil
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When the refrigeration demand is small,（）Athe expansion valve will move toward the wide open positionBthe expansion valve will move toward the closing positionCthe feeler bulb will conveys the high temperatureDthe superheat degree will raise
单选题A feeler or thermal bulb is used for the expansion valve to （）.Adetect the temperatureBdetect the pressureCheat the refrigerantDaccelerate the 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The low pressure side of a refrigeration system is considered to exist from the （）.Aexpansion valve to the compressorBreceiver to the expansion coilCexpansion valve to the evaporatorDcondenser to the expansion valve
单选题The thermal expansion valve responds to the（）Aamount of superheat in the vapor leaving the coilBamount of superheat in the liquidCtemperature in the evaporator coilsDpressure in the evaporator coils
单选题Which of the listed components is considered to separate the high pressure side of a refrigeration cycle from the low pressure side of the cycle?（）AThe condenser and the expansion valveBThe king valve and the solenoid valveCThe compressor and the expansion valveDThe condenser and the solenoid valve
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
单选题One function of the thermal expansion valve is to（）Aact as a pilot from the solenoid valveBregulate the amount of refrigerant flow to the coilCregulate the water flowDturn the compressor off and on