CFESA CERTIFICATION EXAM-ELECTRICAL, GAS, STEAM AND
REFRIGERATION LATEST EXAM 2026/2027 | COMPLETE
QUESTIONS AND ANSWERS (VERIFIED ANSWERS) | EXAM
PREP | LATEST EXAM GUIDE 2026&2027
1. A commercial refrigeration system repeatedly trips its circuit breaker immediately
after the compressor starts. Which condition should be investigated first?
A. Low evaporator superheat
B. Excessive compressor starting current or an electrical fault
C. Dirty condenser fins
D. Incorrect defrost termination temperature
Answer: B
An immediate breaker trip during startup strongly indicates excessive inrush current, a short
circuit, locked-rotor condition, or another electrical fault. The electrical circuit should be
diagnosed before refrigeration adjustments are made.
2. When testing a three-phase motor that is suspected of having incorrect rotation,
what is the most appropriate corrective action if rotation is reversed?
A. Increase the motor overload setting
B. Replace the motor capacitor
C. Interchange any two phase conductors
D. Reduce the supply voltage
Answer: C
Interchanging any two phases of a three-phase supply reverses motor rotation. The change
must be performed with power isolated and according to applicable electrical safety
procedures.
3. A gas-fired commercial appliance has a pilot flame that is present but repeatedly
goes out when the main burner operates. Which component should receive
particular attention?
A. Thermocouple or flame-proving system
B. Condenser fan motor
C. Evaporator pressure regulator
D. Compressor crankcase heater
Answer: A
,A weak or improperly positioned pilot can fail to maintain adequate flame sensing when the
main burner operates. The flame-proving circuit, thermocouple, pilot assembly, and gas
pressure should be evaluated.
4. Before servicing an electrical component inside a commercial foodservice appliance,
what is the safest initial procedure?
A. Turn the thermostat to OFF
B. Remove the appliance's fuse
C. Switch off only the appliance control
D. De-energize and lock out the applicable energy source, then verify absence of voltage
Answer: D
Turning a control OFF does not necessarily remove electrical energy. Proper lockout/tagout
and verification of zero energy protect the technician from unexpected energization.
5. A refrigeration system has a normally clear sight glass that suddenly shows bubbles
continuously during operation. What should the technician investigate?
A. Refrigerant charge or liquid-line restriction
B. Excessive compressor oil level only
C. Incorrect burner ignition
D. Steam trap sizing
Answer: A
Persistent bubbles in a properly operating liquid line can indicate insufficient liquid
refrigerant, a restriction, or inadequate subcooling. System operating conditions should be
measured before adding refrigerant.
6. Why is a condenser kept clean in a commercial refrigeration system?
A. To increase evaporator pressure
B. To improve heat rejection and maintain proper condensing conditions
C. To reduce compressor oil viscosity
D. To eliminate the need for refrigerant
Answer: B
The condenser must reject heat efficiently. Dirt and grease reduce airflow and heat transfer,
increasing condensing pressure and potentially increasing compressor load.
7. A technician measures a motor winding resistance that is substantially different
from the other windings in a three-phase motor. What does this finding suggest?
A. Correct phase balance
B. Proper motor lubrication
C. A possible winding fault requiring further testing
D. Normal operation under all conditions
,Answer: C
Significantly unequal winding resistance can indicate damaged or partially shorted windings,
an open connection, or another electrical problem. Additional insulation and circuit testing is
appropriate.
8. Which instrument is most appropriate for measuring electrical current without
disconnecting a conductor from the circuit?
A. Clamp meter
B. Manifold gauge
C. Megohmmeter
D. Thermocouple simulator
Answer: A
A clamp meter measures current by sensing the magnetic field around a conductor, allowing
current measurements without opening the electrical circuit.
9. A refrigeration compressor is operating with unusually high discharge temperature.
Which condition can contribute directly to this problem?
A. Excessive condenser airflow
B. Low condensing temperature
C. High compression ratio
D. Proper liquid subcooling
Answer: C
A high compression ratio increases compressor discharge temperature. Causes can include
high condensing pressure, low suction pressure, inadequate cooling, or other system
abnormalities.
10. When brazing refrigeration tubing, why should an inert gas such as nitrogen be
used through the tubing when appropriate?
A. To increase refrigerant pressure
B. To prevent internal oxidation and scale formation
C. To replace the system refrigerant
D. To cool the compressor
Answer: B
A controlled nitrogen flow during brazing helps minimize oxidation inside the tubing. Internal
scale can contaminate refrigeration components and restrict flow.
11. A commercial steam appliance takes significantly longer than normal to produce
usable steam. The water supply is confirmed, but the steam generator contains
substantial mineral deposits. What is the most likely issue?
, A. Scale reducing heat-transfer efficiency
B. Excessive refrigeration superheat
C. Reversed compressor rotation
D. Excessive condenser airflow
Answer: A
Mineral scale acts as an insulating layer and reduces heat transfer from the heating surface
to the water. Proper cleaning and water-treatment practices help prevent recurrence.
12. What is the primary purpose of an electrical equipment grounding conductor?
A. To increase normal operating voltage
B. To provide a low-impedance path for fault current
C. To replace the circuit neutral
D. To reduce refrigeration pressure
Answer: B
The equipment grounding path helps carry fault current back toward the source so protective
devices can operate and reduce shock hazards.
13. A gas appliance produces a yellow, unstable burner flame instead of the expected
blue flame. What should the technician consider?
A. Perfect combustion
B. Excessive refrigeration charge
C. Inadequate air supply or burner contamination
D. Correct gas-air adjustment by definition
Answer: C
A yellow or unstable flame can indicate incomplete combustion caused by insufficient primary
air, blocked burner ports, contamination, incorrect gas pressure, or related conditions.
14. What is the primary function of a refrigeration metering device?
A. Increase refrigerant temperature in the condenser
B. Control refrigerant flow into the evaporator and create a pressure drop
C. Remove electrical harmonics
D. Heat the compressor crankcase
Answer: B
The metering device regulates refrigerant entering the evaporator while creating the pressure
difference necessary for evaporation at the desired temperature.
15. A technician discovers that a circuit has been modified from the manufacturer's
wiring diagram. What should the technician do before proceeding with repairs?
REFRIGERATION LATEST EXAM 2026/2027 | COMPLETE
QUESTIONS AND ANSWERS (VERIFIED ANSWERS) | EXAM
PREP | LATEST EXAM GUIDE 2026&2027
1. A commercial refrigeration system repeatedly trips its circuit breaker immediately
after the compressor starts. Which condition should be investigated first?
A. Low evaporator superheat
B. Excessive compressor starting current or an electrical fault
C. Dirty condenser fins
D. Incorrect defrost termination temperature
Answer: B
An immediate breaker trip during startup strongly indicates excessive inrush current, a short
circuit, locked-rotor condition, or another electrical fault. The electrical circuit should be
diagnosed before refrigeration adjustments are made.
2. When testing a three-phase motor that is suspected of having incorrect rotation,
what is the most appropriate corrective action if rotation is reversed?
A. Increase the motor overload setting
B. Replace the motor capacitor
C. Interchange any two phase conductors
D. Reduce the supply voltage
Answer: C
Interchanging any two phases of a three-phase supply reverses motor rotation. The change
must be performed with power isolated and according to applicable electrical safety
procedures.
3. A gas-fired commercial appliance has a pilot flame that is present but repeatedly
goes out when the main burner operates. Which component should receive
particular attention?
A. Thermocouple or flame-proving system
B. Condenser fan motor
C. Evaporator pressure regulator
D. Compressor crankcase heater
Answer: A
,A weak or improperly positioned pilot can fail to maintain adequate flame sensing when the
main burner operates. The flame-proving circuit, thermocouple, pilot assembly, and gas
pressure should be evaluated.
4. Before servicing an electrical component inside a commercial foodservice appliance,
what is the safest initial procedure?
A. Turn the thermostat to OFF
B. Remove the appliance's fuse
C. Switch off only the appliance control
D. De-energize and lock out the applicable energy source, then verify absence of voltage
Answer: D
Turning a control OFF does not necessarily remove electrical energy. Proper lockout/tagout
and verification of zero energy protect the technician from unexpected energization.
5. A refrigeration system has a normally clear sight glass that suddenly shows bubbles
continuously during operation. What should the technician investigate?
A. Refrigerant charge or liquid-line restriction
B. Excessive compressor oil level only
C. Incorrect burner ignition
D. Steam trap sizing
Answer: A
Persistent bubbles in a properly operating liquid line can indicate insufficient liquid
refrigerant, a restriction, or inadequate subcooling. System operating conditions should be
measured before adding refrigerant.
6. Why is a condenser kept clean in a commercial refrigeration system?
A. To increase evaporator pressure
B. To improve heat rejection and maintain proper condensing conditions
C. To reduce compressor oil viscosity
D. To eliminate the need for refrigerant
Answer: B
The condenser must reject heat efficiently. Dirt and grease reduce airflow and heat transfer,
increasing condensing pressure and potentially increasing compressor load.
7. A technician measures a motor winding resistance that is substantially different
from the other windings in a three-phase motor. What does this finding suggest?
A. Correct phase balance
B. Proper motor lubrication
C. A possible winding fault requiring further testing
D. Normal operation under all conditions
,Answer: C
Significantly unequal winding resistance can indicate damaged or partially shorted windings,
an open connection, or another electrical problem. Additional insulation and circuit testing is
appropriate.
8. Which instrument is most appropriate for measuring electrical current without
disconnecting a conductor from the circuit?
A. Clamp meter
B. Manifold gauge
C. Megohmmeter
D. Thermocouple simulator
Answer: A
A clamp meter measures current by sensing the magnetic field around a conductor, allowing
current measurements without opening the electrical circuit.
9. A refrigeration compressor is operating with unusually high discharge temperature.
Which condition can contribute directly to this problem?
A. Excessive condenser airflow
B. Low condensing temperature
C. High compression ratio
D. Proper liquid subcooling
Answer: C
A high compression ratio increases compressor discharge temperature. Causes can include
high condensing pressure, low suction pressure, inadequate cooling, or other system
abnormalities.
10. When brazing refrigeration tubing, why should an inert gas such as nitrogen be
used through the tubing when appropriate?
A. To increase refrigerant pressure
B. To prevent internal oxidation and scale formation
C. To replace the system refrigerant
D. To cool the compressor
Answer: B
A controlled nitrogen flow during brazing helps minimize oxidation inside the tubing. Internal
scale can contaminate refrigeration components and restrict flow.
11. A commercial steam appliance takes significantly longer than normal to produce
usable steam. The water supply is confirmed, but the steam generator contains
substantial mineral deposits. What is the most likely issue?
, A. Scale reducing heat-transfer efficiency
B. Excessive refrigeration superheat
C. Reversed compressor rotation
D. Excessive condenser airflow
Answer: A
Mineral scale acts as an insulating layer and reduces heat transfer from the heating surface
to the water. Proper cleaning and water-treatment practices help prevent recurrence.
12. What is the primary purpose of an electrical equipment grounding conductor?
A. To increase normal operating voltage
B. To provide a low-impedance path for fault current
C. To replace the circuit neutral
D. To reduce refrigeration pressure
Answer: B
The equipment grounding path helps carry fault current back toward the source so protective
devices can operate and reduce shock hazards.
13. A gas appliance produces a yellow, unstable burner flame instead of the expected
blue flame. What should the technician consider?
A. Perfect combustion
B. Excessive refrigeration charge
C. Inadequate air supply or burner contamination
D. Correct gas-air adjustment by definition
Answer: C
A yellow or unstable flame can indicate incomplete combustion caused by insufficient primary
air, blocked burner ports, contamination, incorrect gas pressure, or related conditions.
14. What is the primary function of a refrigeration metering device?
A. Increase refrigerant temperature in the condenser
B. Control refrigerant flow into the evaporator and create a pressure drop
C. Remove electrical harmonics
D. Heat the compressor crankcase
Answer: B
The metering device regulates refrigerant entering the evaporator while creating the pressure
difference necessary for evaporation at the desired temperature.
15. A technician discovers that a circuit has been modified from the manufacturer's
wiring diagram. What should the technician do before proceeding with repairs?
