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In a valve having a MOP (maximum operating pressure), if the pressure in the evaporator increased higher than the MOP of the valve, the valve would then tend to:
close until pressure is reduced
Liquid charge, liquid cross-charge, gas charge, or gas cross-charge refer to:
sensing bulb charges of a TXV
A liquid cross-charge-sensing bulb contains:
a mixture of refrigerants that are different from that of the system
The type of sensing bulb that will prevent liquid floodback on system's startup is the:
gas and gas cross-charge
The superheat can be defined as a ____ that is ____its saturation temperature for a given pressure.
When a TXV tends to overfeed or underfeed in an attempt to find a balance point and become stable, it is known to be:
The main function of the thermostatic expansion valve is to ____ refrigerant flow and ____ a constant superheat.
The thermostatic expansion valve will decrease refrigerant flow when the superheat at the evaporator outlet:
When a thermostatic expansion valve is used, the system's refrigerant charge is generally not as critical as it would be with:
a capillary tube
The sensing bulb is part of the TXV and is connected to the valve by a capillary tube to the:
top of the valve's diaphragm
When the system is in normal operation the sensing-bulb pressure should equal the:
spring and evaporator pressure
The function of the sensing bulb is to:
sense the temperature of the refrigerant vapor as it leaves the evaporator coil
When will the TXV valve pin move to close off the valve port:
when bulb temperature and pressure are reduced
When there is an increase in heat load on the evaporator, the refrigerant will tend to:
evaporate at a faster rate
The term ____ refers to a method of bleeding off or allowing evaporator pressure to pass through a passageway within the valve body.
Thermostatic expansion valves that are internally equalized should be used with:
single-circuit evaporators with no more than the equivalent of 2° F saturated temperature change
The term thermostatic charges refers to:
the substance in the sensing bulb that responds to suction line temperature
The liquid charge-sensing and gas charge-sensing bulb is commonly charged with:
the same type of refrigerant that is in the system
The ____ charge TXV will always have some liquid within the bulb, capillary, and diaphragm.
Which thermostatic charge element contains a mixture of refrigerant that will condense to a small quantity of liquid when the TXV is in its normal operating range:
Which thermostatic charge element has a noncondensable gas along with a special material within the sensing bulb:
Whenever a refrigerant distributor is used on an evaporator coil, a:
TXV with an external equalizer should be used
The de-superheating TXV allows refrigerant to:
cool the hot discharge gas that enters the suction line
Specially designed thermostatic expansion valves must be used when the system's refrigerant is:
Refrigeration systems will generally operate with ____ than air conditioning systems.
a lower superheat
Thermostatic expansion valves can be installed:
in any position but as close to the evaporator as possible
When a refrigerant distributor cannot be directly connected to the TXV outlet, the maximum distance between the valve outlet and the distributor should not exceed:
The only component that should be installed between the TXV outlet and the evaporator is the:
Static pressure will always be present in the liquid line when the TXV and the evaporator are located:
above the receiver
The contact of the TXV sensing bulb on the suction line should be direct on the piping and connected with:
two bulb straps
The TXV sensing bulb needs to be placed at the 4 o' clock or the 8 o' clock position on the suction line when the line is:
7/8" OD or larger
The TXV sensing bulb should be installed on top of the suction line when the line is:
smaller than 7/8" OD
When an application calls for brine tanks and water coolers to be used, the sensing bulb should be:
below the liquid surface
Which statement is true of a thermostatic expansion valve:
Some valves are of the nonadjustable type
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