CFESA REFRIGERATION CERTIFICATION EXAM 2026/2027 |
COMPLETE QUESTIONS AND ANSWERS (VERIFIED ANSWERS) |
EXAM PREP | LATEST EXAM GUIDE 2026&2027
1. A commercial refrigeration system has a suction pressure significantly lower than
normal while the evaporator is fully frosted. Which condition should the technician
investigate first?
A. Excessive condenser airflow
B. Restricted evaporator airflow
C. Oversized condenser
D. Excessive liquid refrigerant charge
Restricted evaporator airflow can reduce heat transfer to the refrigerant, causing the
evaporator temperature and suction pressure to fall. The technician should inspect fans,
airflow passages, filters, and ice accumulation.
2. Before beginning service on a commercial refrigeration system, which action provides
the most important initial safety control?
A. Increase the thermostat setting
B. Close the liquid-line valve
C. Verify electrical isolation and lockout/tagout requirements
D. Remove the evaporator fan guard
Electrical isolation and appropriate lockout/tagout procedures prevent unexpected
energization while the technician is working on the equipment.
3. What is the primary function of a refrigeration compressor?
A. Increase refrigerant pressure and circulate refrigerant through the system
B. Remove moisture from the refrigerant
C. Convert liquid refrigerant directly into ice
D. Regulate evaporator airflow
The compressor raises the pressure and temperature of the refrigerant vapor and drives
refrigerant circulation through the refrigeration circuit.
4. A technician measures a high condensing pressure on an air-cooled refrigeration system.
The condenser coil is visibly covered with dirt and grease. What is the most appropriate
corrective action?
A. Add refrigerant
B. Replace the expansion valve
C. Reduce evaporator airflow
D. Clean the condenser coil and verify operating pressures afterward
,A fouled condenser restricts heat rejection and can elevate condensing pressure. Cleaning the
coil and then verifying system operation addresses the likely cause.
5. Which component meters refrigerant entering many commercial evaporators while
maintaining an appropriate superheat condition?
A. Liquid receiver
B. Thermostatic expansion valve
C. Accumulator
D. Condenser fan motor
A thermostatic expansion valve meters refrigerant into the evaporator in response to
evaporator conditions, helping maintain the desired superheat.
6. A walk-in cooler repeatedly develops heavy ice on the evaporator even though the
refrigeration system appears mechanically sound. Which system should be investigated?
A. Defrost system
B. Condenser fan circuit only
C. Compressor oil level only
D. Receiver sight glass only
A malfunctioning defrost heater, termination control, timer, or related component can allow
excessive ice accumulation and restrict evaporator heat transfer.
7. What does superheat represent in a refrigeration system?
A. The temperature of liquid below its saturation temperature
B. The difference between condenser inlet and outlet pressure
C. The temperature of vapor above its saturation temperature at a given pressure
D. The temperature difference across the condenser fan
Superheat is the amount by which a refrigerant vapor's actual temperature exceeds its
saturation temperature at the measured pressure.
8. A technician suspects a refrigerant leak but cannot locate it visually. Which method is
generally appropriate for confirming the suspected leak?
A. Increase compressor discharge temperature
B. Close the evaporator inlet
C. Add oil to the compressor
D. Use an approved electronic leak detector or suitable leak-detection method
Approved electronic detectors and other accepted leak-detection techniques allow technicians
to identify refrigerant escaping from joints, components, and tubing.
9. What is the principal purpose of the condenser in a vapor-compression refrigeration
system?
A. Reject heat and condense refrigerant vapor into liquid
,B. Increase evaporator superheat
C. Store compressor oil
D. Meter refrigerant into the evaporator
The condenser removes heat from the high-pressure refrigerant vapor, causing it to change
phase into a high-pressure liquid.
10. A refrigerator has a normal evaporator temperature but the product temperature
remains too high. Which issue should be considered before replacing major refrigeration
components?
A. Compressor displacement
B. Door gasket or cabinet air infiltration
C. Refrigerant molecular weight
D. Condenser tube material
Poor door sealing or excessive infiltration introduces warm, moist air and can raise product
temperature even when the refrigeration circuit itself is operating normally.
11. Why is an adequate airflow pattern important in a commercial reach-in refrigerator?
A. It eliminates the need for defrost
B. It prevents all refrigerant leaks
C. It distributes conditioned air around the stored product
D. It increases compressor displacement
Proper airflow promotes uniform cabinet temperatures and allows the evaporator to transfer
heat effectively from the refrigerated space.
12. A compressor starts and stops every few minutes while the cabinet temperature
fluctuates significantly. What condition is commonly associated with this symptom?
A. Incorrect control setting or short cycling condition
B. Perfect system operation
C. Excessive evaporator airflow only
D. Low ambient humidity only
Short cycling may result from incorrect thermostat settings, control problems, inadequate
load, pressure-control issues, or other operating abnormalities and should be diagnosed
systematically.
13. What is the main purpose of a filter-drier installed in a refrigeration system?
A. Increase condenser airflow
B. Control compressor speed
C. Increase evaporator pressure
D. Remove moisture and filter contaminants from the refrigerant circuit
, A filter-drier protects the system by removing moisture and particulate contamination that
could damage components or cause restrictions.
14. A liquid-line sight glass shows bubbles during normal operation. What should the
technician do first?
A. Immediately add a large refrigerant charge
B. Verify operating conditions and investigate possible causes before adding refrigerant
C. Replace the compressor
D. Remove the filter-drier
Bubbles can result from low charge, pressure drop, flashing, restrictions, or operating
conditions. Diagnosis should precede refrigerant addition.
15. Which condition can cause excessively high compressor discharge temperature?
A. Low suction superheat
B. Excessive evaporator airflow
C. High compression ratio or insufficient compressor cooling
D. Clean condenser coil
High compression ratios, low suction pressure, high condensing pressure, and inadequate
compressor cooling can contribute to elevated discharge temperature.
16. What is the primary purpose of an evaporator?
A. Absorb heat from the refrigerated space as refrigerant evaporates
B. Reject heat to outdoor air
C. Store liquid refrigerant permanently
D. Remove compressor oil
The evaporator absorbs heat from the conditioned space, causing the refrigerant to boil and
change from liquid to vapor.
17. A technician finds that an evaporator fan motor is not operating while the compressor
continues to run. What is the most likely immediate consequence?
A. Increased condenser capacity
B. Improved product cooling
C. Higher liquid-line subcooling only
D. Reduced evaporator heat transfer and poor cabinet cooling
Without proper evaporator airflow, heat transfer decreases, potentially causing low suction
pressure, icing, temperature stratification, and poor product cooling.
18. What is subcooling?
A. Vapor temperature above saturation temperature
B. Liquid temperature below its saturation temperature at a given pressure
COMPLETE QUESTIONS AND ANSWERS (VERIFIED ANSWERS) |
EXAM PREP | LATEST EXAM GUIDE 2026&2027
1. A commercial refrigeration system has a suction pressure significantly lower than
normal while the evaporator is fully frosted. Which condition should the technician
investigate first?
A. Excessive condenser airflow
B. Restricted evaporator airflow
C. Oversized condenser
D. Excessive liquid refrigerant charge
Restricted evaporator airflow can reduce heat transfer to the refrigerant, causing the
evaporator temperature and suction pressure to fall. The technician should inspect fans,
airflow passages, filters, and ice accumulation.
2. Before beginning service on a commercial refrigeration system, which action provides
the most important initial safety control?
A. Increase the thermostat setting
B. Close the liquid-line valve
C. Verify electrical isolation and lockout/tagout requirements
D. Remove the evaporator fan guard
Electrical isolation and appropriate lockout/tagout procedures prevent unexpected
energization while the technician is working on the equipment.
3. What is the primary function of a refrigeration compressor?
A. Increase refrigerant pressure and circulate refrigerant through the system
B. Remove moisture from the refrigerant
C. Convert liquid refrigerant directly into ice
D. Regulate evaporator airflow
The compressor raises the pressure and temperature of the refrigerant vapor and drives
refrigerant circulation through the refrigeration circuit.
4. A technician measures a high condensing pressure on an air-cooled refrigeration system.
The condenser coil is visibly covered with dirt and grease. What is the most appropriate
corrective action?
A. Add refrigerant
B. Replace the expansion valve
C. Reduce evaporator airflow
D. Clean the condenser coil and verify operating pressures afterward
,A fouled condenser restricts heat rejection and can elevate condensing pressure. Cleaning the
coil and then verifying system operation addresses the likely cause.
5. Which component meters refrigerant entering many commercial evaporators while
maintaining an appropriate superheat condition?
A. Liquid receiver
B. Thermostatic expansion valve
C. Accumulator
D. Condenser fan motor
A thermostatic expansion valve meters refrigerant into the evaporator in response to
evaporator conditions, helping maintain the desired superheat.
6. A walk-in cooler repeatedly develops heavy ice on the evaporator even though the
refrigeration system appears mechanically sound. Which system should be investigated?
A. Defrost system
B. Condenser fan circuit only
C. Compressor oil level only
D. Receiver sight glass only
A malfunctioning defrost heater, termination control, timer, or related component can allow
excessive ice accumulation and restrict evaporator heat transfer.
7. What does superheat represent in a refrigeration system?
A. The temperature of liquid below its saturation temperature
B. The difference between condenser inlet and outlet pressure
C. The temperature of vapor above its saturation temperature at a given pressure
D. The temperature difference across the condenser fan
Superheat is the amount by which a refrigerant vapor's actual temperature exceeds its
saturation temperature at the measured pressure.
8. A technician suspects a refrigerant leak but cannot locate it visually. Which method is
generally appropriate for confirming the suspected leak?
A. Increase compressor discharge temperature
B. Close the evaporator inlet
C. Add oil to the compressor
D. Use an approved electronic leak detector or suitable leak-detection method
Approved electronic detectors and other accepted leak-detection techniques allow technicians
to identify refrigerant escaping from joints, components, and tubing.
9. What is the principal purpose of the condenser in a vapor-compression refrigeration
system?
A. Reject heat and condense refrigerant vapor into liquid
,B. Increase evaporator superheat
C. Store compressor oil
D. Meter refrigerant into the evaporator
The condenser removes heat from the high-pressure refrigerant vapor, causing it to change
phase into a high-pressure liquid.
10. A refrigerator has a normal evaporator temperature but the product temperature
remains too high. Which issue should be considered before replacing major refrigeration
components?
A. Compressor displacement
B. Door gasket or cabinet air infiltration
C. Refrigerant molecular weight
D. Condenser tube material
Poor door sealing or excessive infiltration introduces warm, moist air and can raise product
temperature even when the refrigeration circuit itself is operating normally.
11. Why is an adequate airflow pattern important in a commercial reach-in refrigerator?
A. It eliminates the need for defrost
B. It prevents all refrigerant leaks
C. It distributes conditioned air around the stored product
D. It increases compressor displacement
Proper airflow promotes uniform cabinet temperatures and allows the evaporator to transfer
heat effectively from the refrigerated space.
12. A compressor starts and stops every few minutes while the cabinet temperature
fluctuates significantly. What condition is commonly associated with this symptom?
A. Incorrect control setting or short cycling condition
B. Perfect system operation
C. Excessive evaporator airflow only
D. Low ambient humidity only
Short cycling may result from incorrect thermostat settings, control problems, inadequate
load, pressure-control issues, or other operating abnormalities and should be diagnosed
systematically.
13. What is the main purpose of a filter-drier installed in a refrigeration system?
A. Increase condenser airflow
B. Control compressor speed
C. Increase evaporator pressure
D. Remove moisture and filter contaminants from the refrigerant circuit
, A filter-drier protects the system by removing moisture and particulate contamination that
could damage components or cause restrictions.
14. A liquid-line sight glass shows bubbles during normal operation. What should the
technician do first?
A. Immediately add a large refrigerant charge
B. Verify operating conditions and investigate possible causes before adding refrigerant
C. Replace the compressor
D. Remove the filter-drier
Bubbles can result from low charge, pressure drop, flashing, restrictions, or operating
conditions. Diagnosis should precede refrigerant addition.
15. Which condition can cause excessively high compressor discharge temperature?
A. Low suction superheat
B. Excessive evaporator airflow
C. High compression ratio or insufficient compressor cooling
D. Clean condenser coil
High compression ratios, low suction pressure, high condensing pressure, and inadequate
compressor cooling can contribute to elevated discharge temperature.
16. What is the primary purpose of an evaporator?
A. Absorb heat from the refrigerated space as refrigerant evaporates
B. Reject heat to outdoor air
C. Store liquid refrigerant permanently
D. Remove compressor oil
The evaporator absorbs heat from the conditioned space, causing the refrigerant to boil and
change from liquid to vapor.
17. A technician finds that an evaporator fan motor is not operating while the compressor
continues to run. What is the most likely immediate consequence?
A. Increased condenser capacity
B. Improved product cooling
C. Higher liquid-line subcooling only
D. Reduced evaporator heat transfer and poor cabinet cooling
Without proper evaporator airflow, heat transfer decreases, potentially causing low suction
pressure, icing, temperature stratification, and poor product cooling.
18. What is subcooling?
A. Vapor temperature above saturation temperature
B. Liquid temperature below its saturation temperature at a given pressure
