DOPE HVACR UNIT 15, OH YEAH HVACR
UNIT 14, HVACR UNIT 13, KILLIN
HVACR UNIT 12, HVACR UNIT 11,
CHILLIN HVACR UNIT 10, HVACR UNIT
9, HVACR UNIT 8, EXAM HVACR
QUESTIONS AND ANSWERS GRADED A+
2026
A TEV with a dead power element will operate: - ANS With a high superheat.
A biflow expansion valve: - ANS Is designed to allow refrigerant flow in both directions.
A device used to evenly distribute mixtures of liquid and vapor refrigerant leaving the TEV to
multiple evaporator circuits is called a: - ANS Refrigerant distributor
A restricted inlet screen on a TEV can cause: - ANS Low suction pressure, high superheat, and
high subcooling.
A system with a loose TEV sensing bulb would most likely: - ANS Have a low superheat.
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
1
,An R-22 refrigeration system requires a superheat of 8°F. If the evaporator saturation pressure is
43 psig, what should the bulb temperature be? - ANS 28°F
As refrigerant passes through the metering device, it: - ANS Drops in pressure and
temperature.
Automatic expansion valves are good at maintaining a constant: - ANS Temperature
Automatic expansion valves are similar in operating concept to: - ANS Pressure regulators
Besides distributing the refrigerant evenly, a refrigerant distributor also: - ANS Creates a
pressure drop across the distributor.
Capillary tube metering devices are commonly used today in: - ANS Window units.
How can moisture in the refrigeration system affect the metering device? - ANS Water can
freeze up at the metering device, causing a restriction.
In an air conditioner with a fixed metering device, a decrease in the outdoor ambient causes: -
ANS Increased system superheat.
Internally equalized thermostatic expansion valves: - ANS Measure the evaporator pressure
through a passageway inside the valve.
One operating advantage of fixed-restriction metering devices over expansion valves is: -
ANS Can be used with low starting torque compressor motors.
Refrigerant leaves the metering device: - ANS As a saturated mixture of liquid and vapor
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
2
,Technicians should be careful when brazing lines to evaporator coils that have preinstalled
thermostatic expansion valves because the heat from brazing the lines: - ANS Can overheat
the TEV bulb and destroy the valve.
The most common application of the high-side float controls is: - ANS Large chillers.
The operation of a thermostatic expansion valve can best be described as: - ANS Bulb
pressure = evaporator pressure + spring pressure.
The superheat is 12°F. What is the suction line temperature if the evaporator saturation
temperature is 35°F? - ANS 47°F
The system capacity of an air conditioner with a fixed metering device: - ANS Decreases when
the indoor wet bulb temperature rises.
The two general categories of metering devices are: - ANS Fixed and modulating.
Thermostatic expansion valves are designed to maintain a constant: - ANS Superheat
Thermostatic expansion valves respond to changes in: - ANS Superheat
To increase superheat on a thermostatic expansion valve, the adjusting stem should be: -
ANS Turned clockwise
To increase the evaporator pressure, the adjustment on top of an automatic expansion valve
should be: - ANS Turned clockwise.
Two types of fixed metering devices are: - ANS Capillary tubes and orifices.
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
3
, Valves that open and close rapidly under the control of electronic circuits are: - ANS Pulse-
modulated valves.
Valves that use motors that move in tiny increments are: - ANS Step motor valves.
What advantages do orifice-type metering devices have over capillary tubes? - ANS They are
easy to change.
What are the parts of a distributor? - ANS A nozzle, conical divider, and multiple holes around
the divider cone
What is the advantage of balanced-port TEVs? - ANS Balanced port valves can retain good
control over a wider range of operating conditions.
What is the evaporator saturation temperature of an R-410A system with a low-side pressure of
107 psig? - ANS 35°F
What is the purpose of TEV sensing bulbs with a limited, or gas charge? - ANS They produce a
maximum operating pressure at high operating superheat.
What senses the line temperature in electronic expansion valves? - ANS Thermistors
What two pieces of information are necessary to measure the TEV superheat? - ANS The
suction line temperature and pressure
When applied to systems with air-cooled condensers, what is the lowest outside ambient
temperature at which balanced-port valves can typically work without head pressure control? -
ANS 35°F
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
4
UNIT 14, HVACR UNIT 13, KILLIN
HVACR UNIT 12, HVACR UNIT 11,
CHILLIN HVACR UNIT 10, HVACR UNIT
9, HVACR UNIT 8, EXAM HVACR
QUESTIONS AND ANSWERS GRADED A+
2026
A TEV with a dead power element will operate: - ANS With a high superheat.
A biflow expansion valve: - ANS Is designed to allow refrigerant flow in both directions.
A device used to evenly distribute mixtures of liquid and vapor refrigerant leaving the TEV to
multiple evaporator circuits is called a: - ANS Refrigerant distributor
A restricted inlet screen on a TEV can cause: - ANS Low suction pressure, high superheat, and
high subcooling.
A system with a loose TEV sensing bulb would most likely: - ANS Have a low superheat.
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
1
,An R-22 refrigeration system requires a superheat of 8°F. If the evaporator saturation pressure is
43 psig, what should the bulb temperature be? - ANS 28°F
As refrigerant passes through the metering device, it: - ANS Drops in pressure and
temperature.
Automatic expansion valves are good at maintaining a constant: - ANS Temperature
Automatic expansion valves are similar in operating concept to: - ANS Pressure regulators
Besides distributing the refrigerant evenly, a refrigerant distributor also: - ANS Creates a
pressure drop across the distributor.
Capillary tube metering devices are commonly used today in: - ANS Window units.
How can moisture in the refrigeration system affect the metering device? - ANS Water can
freeze up at the metering device, causing a restriction.
In an air conditioner with a fixed metering device, a decrease in the outdoor ambient causes: -
ANS Increased system superheat.
Internally equalized thermostatic expansion valves: - ANS Measure the evaporator pressure
through a passageway inside the valve.
One operating advantage of fixed-restriction metering devices over expansion valves is: -
ANS Can be used with low starting torque compressor motors.
Refrigerant leaves the metering device: - ANS As a saturated mixture of liquid and vapor
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
2
,Technicians should be careful when brazing lines to evaporator coils that have preinstalled
thermostatic expansion valves because the heat from brazing the lines: - ANS Can overheat
the TEV bulb and destroy the valve.
The most common application of the high-side float controls is: - ANS Large chillers.
The operation of a thermostatic expansion valve can best be described as: - ANS Bulb
pressure = evaporator pressure + spring pressure.
The superheat is 12°F. What is the suction line temperature if the evaporator saturation
temperature is 35°F? - ANS 47°F
The system capacity of an air conditioner with a fixed metering device: - ANS Decreases when
the indoor wet bulb temperature rises.
The two general categories of metering devices are: - ANS Fixed and modulating.
Thermostatic expansion valves are designed to maintain a constant: - ANS Superheat
Thermostatic expansion valves respond to changes in: - ANS Superheat
To increase superheat on a thermostatic expansion valve, the adjusting stem should be: -
ANS Turned clockwise
To increase the evaporator pressure, the adjustment on top of an automatic expansion valve
should be: - ANS Turned clockwise.
Two types of fixed metering devices are: - ANS Capillary tubes and orifices.
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
3
, Valves that open and close rapidly under the control of electronic circuits are: - ANS Pulse-
modulated valves.
Valves that use motors that move in tiny increments are: - ANS Step motor valves.
What advantages do orifice-type metering devices have over capillary tubes? - ANS They are
easy to change.
What are the parts of a distributor? - ANS A nozzle, conical divider, and multiple holes around
the divider cone
What is the advantage of balanced-port TEVs? - ANS Balanced port valves can retain good
control over a wider range of operating conditions.
What is the evaporator saturation temperature of an R-410A system with a low-side pressure of
107 psig? - ANS 35°F
What is the purpose of TEV sensing bulbs with a limited, or gas charge? - ANS They produce a
maximum operating pressure at high operating superheat.
What senses the line temperature in electronic expansion valves? - ANS Thermistors
What two pieces of information are necessary to measure the TEV superheat? - ANS The
suction line temperature and pressure
When applied to systems with air-cooled condensers, what is the lowest outside ambient
temperature at which balanced-port valves can typically work without head pressure control? -
ANS 35°F
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
4
