Delaware Refrigeration Contractor
Examination Practice Exam 2026 | 100+
Questions & Answers with Detailed
Rationales | Complete Delaware
Refrigeration Contractor Licensing Exam
Prep, Study Guide, Test Review &
Qualification Preparation
1. What is the primary function of a refrigeration compressor?
A. Remove moisture from the refrigerant
B. Raise the refrigerant vapor pressure and circulate refrigerant
C. Reduce condenser temperature
D. Store liquid refrigerant
Answer: Raise the refrigerant vapor pressure and circulate refrigerant
Rationale: The compressor takes low-pressure refrigerant vapor from the
evaporator and compresses it into a high-pressure, high-temperature vapor for
delivery to the condenser.
2. Which component removes heat from the conditioned space or
refrigerated area?
,A. Condenser
B. Compressor
C. Evaporator
D. Receiver
Answer: Evaporator
Rationale: The evaporator absorbs heat from the refrigerated space as the
refrigerant changes from liquid to vapor.
3. What is the primary purpose of a condenser?
A. Absorb heat from the refrigerated space
B. Meter refrigerant flow
C. Reject heat from the refrigerant
D. Increase evaporator pressure
Answer: Reject heat from the refrigerant
Rationale: The condenser removes heat from the refrigerant vapor and changes
it into a liquid.
4. Which device meters refrigerant into the evaporator?
A. Compressor
B. Receiver
C. Condenser fan
D. Expansion device
Answer: Expansion device
Rationale: A thermostatic expansion valve, electronic expansion valve, capillary
tube, or similar metering device controls refrigerant flow into the evaporator.
5. What happens to refrigerant pressure as it passes through a typical
expansion device?
,A. It increases
B. It remains constant
C. It decreases
D. It becomes atmospheric
Answer: It decreases
Rationale: The expansion device creates a pressure drop that lowers the
refrigerant's saturation temperature before it enters the evaporator.
6. What is superheat?
A. Heat added to liquid refrigerant above condensing temperature
B. Heat of a vapor above its saturation temperature
C. Heat removed from the condenser
D. Total heat contained in subcooled liquid
Answer: Heat of a vapor above its saturation temperature
Rationale: Superheat is the temperature of a vapor above its saturation
temperature at a given pressure.
7. What is subcooling?
A. Heating vapor below its saturation temperature
B. Cooling a liquid below its saturation temperature
C. Increasing compressor discharge temperature
D. Reducing evaporator airflow
Answer: Cooling a liquid below its saturation temperature
Rationale: Subcooling indicates that liquid refrigerant has been cooled below its
saturation temperature at the measured pressure.
8. Excessive compressor superheat can result in:
A. Lower discharge temperature
B. Compressor overheating
, C. Flooded condenser
D. Increased liquid return
Answer: Compressor overheating
Rationale: Excessive suction superheat can cause high compressor discharge
temperatures and may damage valves, oil, or motor insulation.
9. What is the purpose of a liquid receiver?
A. Remove noncondensable gases
B. Increase evaporator pressure
C. Store liquid refrigerant
D. Separate oil from vapor
Answer: Store liquid refrigerant
Rationale: A receiver provides storage for liquid refrigerant and helps
accommodate changes in system charge and operating conditions.
10.Which component protects a compressor from liquid refrigerant entering
its suction?
A. Receiver
B. Suction accumulator
C. Filter-drier
D. Condenser
Answer: Suction accumulator
Rationale: A suction accumulator can temporarily collect liquid refrigerant and
help prevent liquid slugging of the compressor.
11.What is refrigerant floodback?
A. Refrigerant leaking from the condenser
B. Refrigerant freezing in the receiver
Examination Practice Exam 2026 | 100+
Questions & Answers with Detailed
Rationales | Complete Delaware
Refrigeration Contractor Licensing Exam
Prep, Study Guide, Test Review &
Qualification Preparation
1. What is the primary function of a refrigeration compressor?
A. Remove moisture from the refrigerant
B. Raise the refrigerant vapor pressure and circulate refrigerant
C. Reduce condenser temperature
D. Store liquid refrigerant
Answer: Raise the refrigerant vapor pressure and circulate refrigerant
Rationale: The compressor takes low-pressure refrigerant vapor from the
evaporator and compresses it into a high-pressure, high-temperature vapor for
delivery to the condenser.
2. Which component removes heat from the conditioned space or
refrigerated area?
,A. Condenser
B. Compressor
C. Evaporator
D. Receiver
Answer: Evaporator
Rationale: The evaporator absorbs heat from the refrigerated space as the
refrigerant changes from liquid to vapor.
3. What is the primary purpose of a condenser?
A. Absorb heat from the refrigerated space
B. Meter refrigerant flow
C. Reject heat from the refrigerant
D. Increase evaporator pressure
Answer: Reject heat from the refrigerant
Rationale: The condenser removes heat from the refrigerant vapor and changes
it into a liquid.
4. Which device meters refrigerant into the evaporator?
A. Compressor
B. Receiver
C. Condenser fan
D. Expansion device
Answer: Expansion device
Rationale: A thermostatic expansion valve, electronic expansion valve, capillary
tube, or similar metering device controls refrigerant flow into the evaporator.
5. What happens to refrigerant pressure as it passes through a typical
expansion device?
,A. It increases
B. It remains constant
C. It decreases
D. It becomes atmospheric
Answer: It decreases
Rationale: The expansion device creates a pressure drop that lowers the
refrigerant's saturation temperature before it enters the evaporator.
6. What is superheat?
A. Heat added to liquid refrigerant above condensing temperature
B. Heat of a vapor above its saturation temperature
C. Heat removed from the condenser
D. Total heat contained in subcooled liquid
Answer: Heat of a vapor above its saturation temperature
Rationale: Superheat is the temperature of a vapor above its saturation
temperature at a given pressure.
7. What is subcooling?
A. Heating vapor below its saturation temperature
B. Cooling a liquid below its saturation temperature
C. Increasing compressor discharge temperature
D. Reducing evaporator airflow
Answer: Cooling a liquid below its saturation temperature
Rationale: Subcooling indicates that liquid refrigerant has been cooled below its
saturation temperature at the measured pressure.
8. Excessive compressor superheat can result in:
A. Lower discharge temperature
B. Compressor overheating
, C. Flooded condenser
D. Increased liquid return
Answer: Compressor overheating
Rationale: Excessive suction superheat can cause high compressor discharge
temperatures and may damage valves, oil, or motor insulation.
9. What is the purpose of a liquid receiver?
A. Remove noncondensable gases
B. Increase evaporator pressure
C. Store liquid refrigerant
D. Separate oil from vapor
Answer: Store liquid refrigerant
Rationale: A receiver provides storage for liquid refrigerant and helps
accommodate changes in system charge and operating conditions.
10.Which component protects a compressor from liquid refrigerant entering
its suction?
A. Receiver
B. Suction accumulator
C. Filter-drier
D. Condenser
Answer: Suction accumulator
Rationale: A suction accumulator can temporarily collect liquid refrigerant and
help prevent liquid slugging of the compressor.
11.What is refrigerant floodback?
A. Refrigerant leaking from the condenser
B. Refrigerant freezing in the receiver
