更多"The thermal expansion valve reacts "的相关试题:
[单项选择]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
[单项选择]The thermal expansion valve controls the amount of refrigerant that is allowed to flow to the （）.
A. compressor
B. cooling coils
C. condenser
D. receiver
[单项选择]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
[单项选择]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
[单项选择]One function of the thermal expansion valve is to（）
A. act as a pilot from the solenoid valve
B. regulate the amount of refrigerant flow to the coil
C. regulate the water flow
D. turn the compressor off and on
[单项选择]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 coil
B. increase the superheat at the bulb
C. deliver more refrigerant to the coil
D. decrease the capacity of the coil
[单项选择]A thermostatic expansion valve is properly controlling evaporator superheatAdjusting this valve to lower the superheat will result in a/an （）.
A. evaporator pressure decrease
B. evaporator coil over-feed
C. evaporator capacity increase
D. expansion valve diaphragm rupture
[单项选择]Thermostatic expansion valve are （）.
A. either all the way open or all the way closed
B. normally open
C. throttled depending on load
D. controlled by suction pressure
[单项选择]During working, thermostatic expansion valve should be （）.
A. either all the way open or all the way closed
B. normally fully open
C. throttled depending on load
D. controlled by liquefied pressure
[单项选择]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
[单项选择]The expansion valve on a Freon system controls the （）.
A. superheat of the gas leaving the compressor
B. back pressure in the evaporator
C. temperature of the icebox
D. superheat of the gas leaving the evaporator
[单项选择]When you adjust a thermostatic expansion valve, （）.
A. refrigerant must be bled off the sensing line before adjustments are made
B. all refrigerant must be pumped into the receiver before adjustments are made
C. time must be allowed for conditions to stabilize in the evaporator before further adjustments are made
D. all refrigerant must be routed through the dehydrator while changing the superheat setting
[单项选择]Because the expansion valve is just （） way open, the refrigerant is under low pressure in the evaporator.
A. little
B. few
C. a little
D. a few
[单项选择]A feeler or thermal bulb is used for the expansion valve to （）.
A. detect the temperature
B. detect the pressure
C. heat the refrigerant
D. accelerate the refrigerant
[单项选择]Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）
A. closing later
B. opening sooner
C. staying open for a shorter period of time
D. staying open for a longer period of time
[单项选择]The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.
A. be jammed
B. be opened
C. be seated
D. be broken
[单项选择]Thermostatic expansion valves can be adjusted for （）.
A. suction pressure only
B. head pressure only
C. superheat only
D. suction pressure and box temperature
[单项选择]A ruptured diaphragm in a thermostatic expansion valve will cause the valve to （）.
A. open
B. close
C. remain in its position
D. flood the evaporator with refrigerant
