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单选题
After passing through the expansion valve the refrigerant should be in the state of （）.
A
vapor
B
liquid
C
solid
D
None of the above is tree
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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
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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
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单选题Which of the problems listed could be indicated if a sight glass in the refrigerant liquid line is full of bubbles?（）A
Proper refrigerant chargeB
Faulty expansion valveC
Insufficient refrigerantD
Solenoid valve stuck open
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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
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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
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单选题When you adjust a thermostatic expansion valve, （）.A
refrigerant must be bled off the sensing line before adjustments are madeB
all refrigerant must be pumped into the receiver before adjustments are madeC
time must be allowed for conditions to stabilize in the evaporator before further adjustments are madeD
all refrigerant must be routed through the dehydrator while changing the superheat setting
考题
单选题Which of the conditions listed will cause a refrigeration compressor to run constantly without simultaneously decreasing the temperature in the refrigerated space?（）A
Shortage of refrigerant oilB
Slight shortage of refrigerantC
Excessive condenser cooling water flowD
Faulty expansion valve
考题
单选题As the refrigerant passes through the valve orifice, its pressure is reduced and part of the refrigerant turns into （）.A
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oily mixtureC
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单选题A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water （）.A
around the engineB
around the coolerC
to the expansion tankD
overboard
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单选题In a compression refrigeration plant the refrigerant flows from the expansion valve and through the （） where it absorbs heat from the space being cooled and becomes a gas or vapor.A
compressorB
condenserC
throttle valveD
evaporator
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A pressure drop through the refrigerant liquid line may cause （）.A
solenoid valve to seizeB
compressor to huntC
formation of flash gas in the liquid lineD
expansion valve to freeze open
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单选题The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by （）.A
passing it through the expansion valveB
condensing refrigerant in the system condenserC
passing the gaseous refrigerant through the heat interchanger on the suction side of the compressorD
maintaining a high pressure on the systems receiver
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单选题After passing through the turbine the exhaust gas is conducted out into the（）.A
intercoolerB
compressorC
cylinderD
open air
考题
单选题Because the expansion valve is just （） way open, the refrigerant is under low pressure in the evaporator.A
littleB
fewC
a littleD
a few
考题
单选题Moisture in the refrigerant may （）.A
freeze on the expansion valve seat and reduce the flow of liquid refrigerantB
emulsify the oil in the condenserC
freeze in the king valveD
clog the oil trap
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
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单选题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
考题
单选题To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the （）.A
discharge service valve as a vaporB
suction service valve as a liquidC
charging valve as a liquidD
condenser purge valve as a vapor
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The thermostatic valve has a throttling action, that is to say the valve can（）A
stop the refrigerant from flowingB
force the refrigerant to flowC
cause the refrigerant pressure to riseD
cause the refrigerant pressure to fall
考题
单选题Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?（）A
At the designed operating temperature, the liquid refrigerant charge has changed to a vaporB
The liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivityC
The sensing bulb is empty of liquid refrigerant charge at the designed operating temperatureD
The sensing bulb is never emptied of liquid refrigerant under normal operating conditions
考题
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 （）.A
change the expansion valve adjustmentB
readjust the water regulating valve to increase the flow of waterC
purge air from the condenserD
clean the waterside of the condenser
考题
单选题The principal purpose of sub-cooling liquid refrigerant prior to its entering the expansion valve is to （）.A
increase the refrigerating effect, by decreasing the amount of flash gasB
allow the refrigerant to enter the throttling device in a saturated conditionC
increase the refrigerating effect by increasing the amount of flash gasD
minimize the temperature drop of the liquid as it passes through the solenoid valve to the outlet side
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
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