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单选题
The thermal expansion valve reacts directly to the （）
A
temperature in the space being cooled
B
liquid refrigerant pressure at the solenoid valve
C
pressure drop across the evaporator coils
D
refrigerant gas superheat at the coil outlet
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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
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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Which of the following statements is correct concerning a typical shipboard multi-coil refrigeration system?（）A
The liquid receiver functions to collect and remove non-condensable gasesB
A thermostatic expansion valve is used to control refrigerated space temperatureC
Refrigerant temperature in an evaporator is directly related to refrigerant pressureD
Dehydrators must be used continuously in a refrigeration system
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
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
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