CFESA MASTER TECHNICIAN EXAM 2026/2027 | COMPLETE
QUESTIONS AND ANSWERS (VERIFIED ANSWERS) | EXAM
PREP | LATEST EXAM GUIDE 2026&2027
1. A commercial gas-fired appliance has a normal ignition sequence, but the burner shuts
down shortly after ignition. Which condition should a technician investigate first?
A. Excessive cabinet insulation
B. Flame-sensing or flame-proving failure
C. Oversized drain piping
D. Incorrect water filtration
Answer: B
A burner that lights and then shuts down commonly indicates that the control system is not
receiving a valid flame-proving signal. The technician should verify flame-sensing
components, grounding, wiring, and flame quality before replacing unrelated components.
2. Before beginning electrical troubleshooting inside a commercial cooking appliance, what
is the most appropriate first safety action?
A. Increase the appliance thermostat setting
B. Remove the control board
C. De-energize and verify absence of electrical power
D. Disconnect the gas supply only
Answer: C
Electrical troubleshooting requires the equipment to be safely de-energized when energized
testing is not required. Lockout/tagout procedures and verification of the absence of voltage
reduce the risk of shock and unexpected equipment operation.
3. A technician measures a significant voltage drop across a closed contactor while the load
is operating. What does this most strongly indicate?
A. Excessive resistance at the contactor contacts
B. Correct contactor operation
C. An oversized conductor
D. A properly balanced load
Answer: A
A properly closed contactor should have very little voltage drop across its contacts. A
substantial drop indicates unwanted resistance, commonly caused by damaged, burned, or
contaminated contacts.
,4. A commercial convection oven consistently produces uneven browning from one side of
the cavity to the other. Which component should receive particular attention?
A. Door handle
B. Drain valve
C. Gas shutoff valve
D. Air circulation system
Answer: D
Convection ovens depend on proper air movement for uniform heat distribution. A damaged
fan, incorrect fan rotation, blocked airflow, or related circulation problem can produce
uneven cooking.
5. During preventive maintenance, a technician discovers a cracked gas connector behind a
range. What is the best immediate response?
A. Continue operation and document it
B. Apply tape over the crack
C. Remove the appliance from service until the connector is properly replaced
D. Increase incoming gas pressure
Answer: C
A damaged gas connector represents a serious combustion and fire hazard. The equipment
should not be returned to service until the defective component is replaced according to
applicable requirements.
6. A refrigeration system has a clean condenser but operates at unusually high head
pressure. Which condition should be considered?
A. Non-condensable gases or excessive refrigerant charge
B. Low evaporator airflow only
C. Incorrect door gasket color
D. Excessive drain slope
Answer: A
High condensing pressure with an adequately clean condenser can result from overcharging
or non-condensable gases. System operating conditions and manufacturer specifications
should be evaluated before refrigerant is added or removed.
7. What is the primary purpose of a pressure regulator in a commercial gas appliance
installation?
A. Increase combustion temperature
B. Maintain the required gas pressure supplied to the appliance
C. Remove carbon monoxide from combustion products
D. Control water hardness
,Answer: B
The regulator maintains gas pressure within the range required by the appliance. Stable inlet
pressure is essential for proper burner operation, combustion, and safety.
8. A technician finds that a motor repeatedly trips its overload protector after several
minutes of operation. Which investigation is most appropriate?
A. Replace the appliance nameplate
B. Increase the overload setting without testing
C. Check only the thermostat
D. Check motor load, bearings, voltage, current, and airflow conditions
Answer: D
Repeated overload operation indicates that the motor is drawing excessive current or is
otherwise being subjected to abnormal operating conditions. Increasing the overload setting
without diagnosis could create a dangerous condition.
9. A customer reports that a fryer takes much longer than normal to recover temperature
after food is added. Which condition could directly cause this symptom?
A. Restricted burner operation or inadequate heat transfer
B. Excessively bright display lighting
C. Oversized drain piping
D. Incorrect casters
Answer: A
Slow recovery indicates that the fryer is not delivering or transferring heat at its expected
rate. Burner performance, gas pressure, heat-transfer surfaces, controls, and related
components should be evaluated.
10. When measuring resistance through a component with electronic circuitry connected to
it, why should the technician follow the manufacturer's testing procedure?
A. Resistance is always independent of circuit configuration
B. Connected circuitry can affect the measurement or be damaged
C. Resistance cannot be measured on commercial equipment
D. Electronic controls never contain resistive components
Answer: B
Parallel circuits and electronic components can alter resistance readings, and applying test
voltage through a meter can damage sensitive circuitry in some circumstances. Manufacturer
procedures provide the appropriate test method.
11. A three-phase motor has noticeably higher current on one phase than the other two.
What should the technician investigate?
, A. Door alignment
B. Water filtration
C. Phase imbalance, connections, and motor condition
D. Drain temperature
Answer: C
Unequal phase current can indicate supply imbalance, poor connections, winding problems, or
abnormal mechanical loading. The condition should be diagnosed before continued operation
damages the motor.
12. What is the principal reason for verifying equipment grounding after electrical repairs?
A. To improve cooking speed
B. To increase compressor capacity
C. To reduce water consumption
D. To provide a safe path for fault current
Answer: D
Proper grounding helps ensure that a fault current can travel through a low-impedance path
and allow protective devices to operate, reducing the risk of electric shock and equipment
damage.
13. A steam table is unable to maintain proper food temperature even though the heating
element cycles normally. What should be checked next?
A. Water level and heat-transfer conditions
B. Door hinge lubrication
C. Gas manifold pressure
D. Refrigerant superheat
Answer: A
Steam tables depend on proper water level and heat transfer between the heating system
and food pans. Insufficient water or improper pan contact can reduce heating effectiveness
even when the element operates normally.
14. A technician discovers that a circuit breaker trips immediately whenever a heating
element is energized. What is the most likely area of concern?
A. Refrigerant charge
B. Short circuit or ground fault involving the heating circuit
C. Water hardness
D. Exhaust hood velocity only
Answer: B
QUESTIONS AND ANSWERS (VERIFIED ANSWERS) | EXAM
PREP | LATEST EXAM GUIDE 2026&2027
1. A commercial gas-fired appliance has a normal ignition sequence, but the burner shuts
down shortly after ignition. Which condition should a technician investigate first?
A. Excessive cabinet insulation
B. Flame-sensing or flame-proving failure
C. Oversized drain piping
D. Incorrect water filtration
Answer: B
A burner that lights and then shuts down commonly indicates that the control system is not
receiving a valid flame-proving signal. The technician should verify flame-sensing
components, grounding, wiring, and flame quality before replacing unrelated components.
2. Before beginning electrical troubleshooting inside a commercial cooking appliance, what
is the most appropriate first safety action?
A. Increase the appliance thermostat setting
B. Remove the control board
C. De-energize and verify absence of electrical power
D. Disconnect the gas supply only
Answer: C
Electrical troubleshooting requires the equipment to be safely de-energized when energized
testing is not required. Lockout/tagout procedures and verification of the absence of voltage
reduce the risk of shock and unexpected equipment operation.
3. A technician measures a significant voltage drop across a closed contactor while the load
is operating. What does this most strongly indicate?
A. Excessive resistance at the contactor contacts
B. Correct contactor operation
C. An oversized conductor
D. A properly balanced load
Answer: A
A properly closed contactor should have very little voltage drop across its contacts. A
substantial drop indicates unwanted resistance, commonly caused by damaged, burned, or
contaminated contacts.
,4. A commercial convection oven consistently produces uneven browning from one side of
the cavity to the other. Which component should receive particular attention?
A. Door handle
B. Drain valve
C. Gas shutoff valve
D. Air circulation system
Answer: D
Convection ovens depend on proper air movement for uniform heat distribution. A damaged
fan, incorrect fan rotation, blocked airflow, or related circulation problem can produce
uneven cooking.
5. During preventive maintenance, a technician discovers a cracked gas connector behind a
range. What is the best immediate response?
A. Continue operation and document it
B. Apply tape over the crack
C. Remove the appliance from service until the connector is properly replaced
D. Increase incoming gas pressure
Answer: C
A damaged gas connector represents a serious combustion and fire hazard. The equipment
should not be returned to service until the defective component is replaced according to
applicable requirements.
6. A refrigeration system has a clean condenser but operates at unusually high head
pressure. Which condition should be considered?
A. Non-condensable gases or excessive refrigerant charge
B. Low evaporator airflow only
C. Incorrect door gasket color
D. Excessive drain slope
Answer: A
High condensing pressure with an adequately clean condenser can result from overcharging
or non-condensable gases. System operating conditions and manufacturer specifications
should be evaluated before refrigerant is added or removed.
7. What is the primary purpose of a pressure regulator in a commercial gas appliance
installation?
A. Increase combustion temperature
B. Maintain the required gas pressure supplied to the appliance
C. Remove carbon monoxide from combustion products
D. Control water hardness
,Answer: B
The regulator maintains gas pressure within the range required by the appliance. Stable inlet
pressure is essential for proper burner operation, combustion, and safety.
8. A technician finds that a motor repeatedly trips its overload protector after several
minutes of operation. Which investigation is most appropriate?
A. Replace the appliance nameplate
B. Increase the overload setting without testing
C. Check only the thermostat
D. Check motor load, bearings, voltage, current, and airflow conditions
Answer: D
Repeated overload operation indicates that the motor is drawing excessive current or is
otherwise being subjected to abnormal operating conditions. Increasing the overload setting
without diagnosis could create a dangerous condition.
9. A customer reports that a fryer takes much longer than normal to recover temperature
after food is added. Which condition could directly cause this symptom?
A. Restricted burner operation or inadequate heat transfer
B. Excessively bright display lighting
C. Oversized drain piping
D. Incorrect casters
Answer: A
Slow recovery indicates that the fryer is not delivering or transferring heat at its expected
rate. Burner performance, gas pressure, heat-transfer surfaces, controls, and related
components should be evaluated.
10. When measuring resistance through a component with electronic circuitry connected to
it, why should the technician follow the manufacturer's testing procedure?
A. Resistance is always independent of circuit configuration
B. Connected circuitry can affect the measurement or be damaged
C. Resistance cannot be measured on commercial equipment
D. Electronic controls never contain resistive components
Answer: B
Parallel circuits and electronic components can alter resistance readings, and applying test
voltage through a meter can damage sensitive circuitry in some circumstances. Manufacturer
procedures provide the appropriate test method.
11. A three-phase motor has noticeably higher current on one phase than the other two.
What should the technician investigate?
, A. Door alignment
B. Water filtration
C. Phase imbalance, connections, and motor condition
D. Drain temperature
Answer: C
Unequal phase current can indicate supply imbalance, poor connections, winding problems, or
abnormal mechanical loading. The condition should be diagnosed before continued operation
damages the motor.
12. What is the principal reason for verifying equipment grounding after electrical repairs?
A. To improve cooking speed
B. To increase compressor capacity
C. To reduce water consumption
D. To provide a safe path for fault current
Answer: D
Proper grounding helps ensure that a fault current can travel through a low-impedance path
and allow protective devices to operate, reducing the risk of electric shock and equipment
damage.
13. A steam table is unable to maintain proper food temperature even though the heating
element cycles normally. What should be checked next?
A. Water level and heat-transfer conditions
B. Door hinge lubrication
C. Gas manifold pressure
D. Refrigerant superheat
Answer: A
Steam tables depend on proper water level and heat transfer between the heating system
and food pans. Insufficient water or improper pan contact can reduce heating effectiveness
even when the element operates normally.
14. A technician discovers that a circuit breaker trips immediately whenever a heating
element is energized. What is the most likely area of concern?
A. Refrigerant charge
B. Short circuit or ground fault involving the heating circuit
C. Water hardness
D. Exhaust hood velocity only
Answer: B
