Delaware HVACR Journeyperson
Qualification Practice Exam 2026 | 100+
Questions & Answers with Detailed
Rationales | Complete Delaware HVACR
Journeyperson Exam Prep, Study Guide,
Test Review & Qualification Preparation
1. What is the primary purpose of a refrigeration system?
A. To generate heat
B. To transfer heat from a lower-temperature space to a higher-temperature
location
C. To increase humidity
D. To produce electricity
Answer: To transfer heat from a lower-temperature space to a higher-
temperature location
Rationale: Refrigeration does not destroy heat; it removes heat from a
conditioned space and rejects it elsewhere.
2. Which component of a vapor-compression system raises the pressure and
temperature of the refrigerant vapor?
,A. Evaporator
B. Condenser
C. Compressor
D. Expansion valve
Answer: Compressor
Rationale: The compressor takes low-pressure vapor from the evaporator and
compresses it into a high-pressure, high-temperature vapor.
3. What is the primary function of the condenser?
A. Absorb indoor heat
B. Reject heat from the refrigerant
C. Reduce refrigerant pressure
D. Meter refrigerant flow
Answer: Reject heat from the refrigerant
Rationale: The condenser removes heat from the refrigerant and changes it from
vapor to liquid.
4. Which component meters refrigerant into the evaporator?
A. Compressor
B. Condenser fan
C. Expansion device
D. Receiver
Answer: Expansion device
Rationale: The expansion device controls refrigerant flow and reduces its
pressure before it enters the evaporator.
5. What happens to refrigerant pressure as it passes through a typical
expansion valve?
,A. It increases
B. It remains constant
C. It decreases
D. It doubles
Answer: It decreases
Rationale: The expansion device creates a pressure drop that allows the
refrigerant to evaporate at a lower temperature.
6. Which refrigerant condition is normally present at the compressor inlet?
A. High-pressure liquid
B. Low-pressure vapor
C. High-pressure liquid-vapor mixture
D. Atmospheric air
Answer: Low-pressure vapor
Rationale: A properly operating vapor-compression system supplies vapor to the
compressor inlet to prevent liquid slugging.
7. What does superheat represent?
A. Temperature below saturation
B. Temperature of liquid above freezing
C. Temperature of vapor above its saturation temperature
D. Pressure above atmospheric pressure
Answer: Temperature of vapor above its saturation temperature
Rationale: Superheat is the difference between actual vapor temperature and
the saturation temperature at the measured pressure.
8. What does subcooling indicate?
A. Liquid temperature below its saturation temperature
B. Vapor temperature above saturation
, C. Compressor temperature
D. Air temperature below freezing
Answer: Liquid temperature below its saturation temperature
Rationale: Subcooling is the difference between refrigerant saturation
temperature and the actual liquid temperature.
9. What is a common purpose of a liquid receiver?
A. Store excess liquid refrigerant
B. Remove moisture from air
C. Increase compressor speed
D. Heat the evaporator
Answer: Store excess liquid refrigerant
Rationale: A receiver provides a controlled storage location for liquid refrigerant
in systems designed to use one.
10.What is the purpose of a filter-drier?
A. Increase refrigerant pressure
B. Remove moisture and contaminants from the refrigerant
C. Increase airflow
D. Raise evaporator temperature
Answer: Remove moisture and contaminants from the refrigerant
Rationale: Filter-driers help protect the refrigeration system from moisture,
acids, dirt, and other contaminants.
11.Why is moisture dangerous in a refrigeration system?
A. It always increases airflow
B. It can freeze and cause corrosion or acid formation
C. It increases electrical voltage
D. It eliminates superheat
Qualification Practice Exam 2026 | 100+
Questions & Answers with Detailed
Rationales | Complete Delaware HVACR
Journeyperson Exam Prep, Study Guide,
Test Review & Qualification Preparation
1. What is the primary purpose of a refrigeration system?
A. To generate heat
B. To transfer heat from a lower-temperature space to a higher-temperature
location
C. To increase humidity
D. To produce electricity
Answer: To transfer heat from a lower-temperature space to a higher-
temperature location
Rationale: Refrigeration does not destroy heat; it removes heat from a
conditioned space and rejects it elsewhere.
2. Which component of a vapor-compression system raises the pressure and
temperature of the refrigerant vapor?
,A. Evaporator
B. Condenser
C. Compressor
D. Expansion valve
Answer: Compressor
Rationale: The compressor takes low-pressure vapor from the evaporator and
compresses it into a high-pressure, high-temperature vapor.
3. What is the primary function of the condenser?
A. Absorb indoor heat
B. Reject heat from the refrigerant
C. Reduce refrigerant pressure
D. Meter refrigerant flow
Answer: Reject heat from the refrigerant
Rationale: The condenser removes heat from the refrigerant and changes it from
vapor to liquid.
4. Which component meters refrigerant into the evaporator?
A. Compressor
B. Condenser fan
C. Expansion device
D. Receiver
Answer: Expansion device
Rationale: The expansion device controls refrigerant flow and reduces its
pressure before it enters the evaporator.
5. What happens to refrigerant pressure as it passes through a typical
expansion valve?
,A. It increases
B. It remains constant
C. It decreases
D. It doubles
Answer: It decreases
Rationale: The expansion device creates a pressure drop that allows the
refrigerant to evaporate at a lower temperature.
6. Which refrigerant condition is normally present at the compressor inlet?
A. High-pressure liquid
B. Low-pressure vapor
C. High-pressure liquid-vapor mixture
D. Atmospheric air
Answer: Low-pressure vapor
Rationale: A properly operating vapor-compression system supplies vapor to the
compressor inlet to prevent liquid slugging.
7. What does superheat represent?
A. Temperature below saturation
B. Temperature of liquid above freezing
C. Temperature of vapor above its saturation temperature
D. Pressure above atmospheric pressure
Answer: Temperature of vapor above its saturation temperature
Rationale: Superheat is the difference between actual vapor temperature and
the saturation temperature at the measured pressure.
8. What does subcooling indicate?
A. Liquid temperature below its saturation temperature
B. Vapor temperature above saturation
, C. Compressor temperature
D. Air temperature below freezing
Answer: Liquid temperature below its saturation temperature
Rationale: Subcooling is the difference between refrigerant saturation
temperature and the actual liquid temperature.
9. What is a common purpose of a liquid receiver?
A. Store excess liquid refrigerant
B. Remove moisture from air
C. Increase compressor speed
D. Heat the evaporator
Answer: Store excess liquid refrigerant
Rationale: A receiver provides a controlled storage location for liquid refrigerant
in systems designed to use one.
10.What is the purpose of a filter-drier?
A. Increase refrigerant pressure
B. Remove moisture and contaminants from the refrigerant
C. Increase airflow
D. Raise evaporator temperature
Answer: Remove moisture and contaminants from the refrigerant
Rationale: Filter-driers help protect the refrigeration system from moisture,
acids, dirt, and other contaminants.
11.Why is moisture dangerous in a refrigeration system?
A. It always increases airflow
B. It can freeze and cause corrosion or acid formation
C. It increases electrical voltage
D. It eliminates superheat
