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单选题
The thermal expansion valve responds to the()
A

amount of superheat in the vapor leaving the coil

B

amount of superheat in the liquid

C

temperature in the evaporator coils

D

pressure in the evaporator coils


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更多 “单选题The thermal expansion valve responds to the()A amount of superheat in the vapor leaving the coilB amount of superheat in the liquidC temperature in the evaporator coilsD pressure in the evaporator coils” 相关考题
考题 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

考题 单选题The thermal expansion valve controls the amount of refrigerant that is allowed to flow to the ().A compressorB cooling coilsC condenserD receiver

考题 单选题If a refrigeration system compressor crankcase is sweating, you should ().A add refrigerant to the systemB adjust the thermal expansion valve to the proper settingC adjust the float valve to the proper holding pressureD open the hand expansion valve

考题 单选题A ruptured diaphragm in a thermostatic expansion valve will cause the valve to ().A openB closeC remain in its positionD flood the evaporator with refrigerant

考题 单选题Aluminum pistons have () coefficient of thermal expansion compared with those of cast iron.A higherB lowerC the sameD none of the above

考题 单选题Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?()A Lube oil passing through the systemB Moisture or foreign matter collecting at the valve seat and orificeC Variable spring tension caused by the changing temperatureD Frost on the liquid line

考题 单选题The scale trap is located between the ()A king valve and the expansion valveB solenoid valve and expansion valveC evaporator and receiverD compressor and evaporator

考题 单选题What is the function of thermostatic expansion valve in a compression refrigeration system?()A nonexistentB for controlling pressureC for controlling superheatD for controlling the solenoid valve

考题 单选题When a refrigeration compressor is in the ‘off’ cycle, the thermal expansion valve will().A always be wide open when the compressor restartsB continue to operate as if the system were in operationC remain open until evaporator pressure equalizes, then close until the compressor restartsD always be completely closed until the compressor restarts

考题 单选题The bulb for the thermal expansion valve is located()A in the middle of evaporator coilsB near the evaporator coil outletC near the evaporator coil inletD on the bottom row of evaporator coils

考题 单选题What separate the high pressure side from the low pressure side in a refrigeration system?()A Condenser and thermal expansion valveB King and solenoid valvesC Compressor and thermal expansion valveD Condenser and solenoid valve

考题 单选题The thermal expansion valve reacts directly to the ()A temperature in the space being cooledB liquid refrigerant pressure at the solenoid valveC pressure drop across the evaporator coilsD refrigerant gas superheat at the coil outlet

考题 单选题A thermostatic expansion valve is properly controlling evaporator superheatAdjusting this valve to lower the superheat will result in a/an ().A evaporator pressure decreaseB evaporator coil over-feedC evaporator capacity increaseD expansion valve diaphragm rupture

考题 单选题() pistons have low inertia and high coefficient of thermal expansion.A Cast ironB Cast steelC Forged steelD Aluminum

考题 单选题When the heat load begins to increase, the needle valve of an expansion valve will()A move in an opening directionB move in a closing directionC either open or closeD not move at all

考题 单选题A solenoid valve used in a refrigeration system should be installed ().A with the axis of the solenoid horizontal, sensing temperature of the box, and upstream of the thermal expansion valveB upright, sensing temperature of the box, and upstream of the thermal expansion valveC upright, sensing temperature of the box, and downstream of the thermal expansion valveD upright, sensing heat of the tail coil, and upstream of the thermal expansion valve

考题 单选题A cracked diaphragm in a thermostatic expansion valve will cause the valve to ().A return to a neutral positionB flood the evaporatorC openD close

考题 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 ().A increase the capacity of the coilB increase the superheat at the bulbC deliver more refrigerant to the coilD decrease the capacity of the coil

考题 单选题When the refrigeration demand is small,()A the expansion valve will move toward the wide open positionB the expansion valve will move toward the closing positionC the feeler bulb will conveys the high temperatureD the superheat degree will raise

考题 单选题After passing through the expansion valve the refrigerant should be in the state of ().A vaporB liquidC solidD None of the above is tree

考题 单选题A feeler or thermal bulb is used for the expansion valve to ().A detect the temperatureB detect the pressureC heat the refrigerantD accelerate the refrigerant

考题 单选题To correct the condition of slugging and flooding back in a refrigeration system, it may be necessary to ().A re-adjust the discharge pressureB clean the expansion valve screenC add refrigerantD adjust the expansion valve

考题 单选题The low pressure side of a refrigeration system is considered to exist from the ().A expansion valve to the compressorB receiver to the expansion coilC expansion valve to the evaporatorD condenser to the expansion valve

考题 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?()A The condenser and the expansion valveB The king valve and the solenoid valveC The compressor and the expansion valveD The condenser and the solenoid valve

考题 单选题A pressure drop in the liquid line of a refrigeration system may cause()A the solenoid valve to seizeB the compressor to huntC flash gas to form in the liquid lineD the expansion valve to freeze open

考题 单选题One function of the thermal expansion valve is to()A act as a pilot from the solenoid valveB regulate the amount of refrigerant flow to the coilC regulate the water flowD turn the compressor off and on

考题 单选题A spring-loaded centrifugal flyweight governor responds to reduced engine load with an immediate increase in ()A pilot valve oil pressureB speeder spring forceC compensation needle valve clearanceD centrifugal force on the flyweights