CFESA Certified Food Equipment Service Technician Exam — Questions and Answers

Question 1: A convection steamer is producing wet, watery steam instead of dry steam. Which component failure most likely causes this condition?

Failed door gasket allowing cold air infiltration
Overfilled generator due to a stuck-open fill solenoid or failed water level control (Correct answer)
Burned-out heating element in one phase
Clogged steam outlet nozzle

Correct answer: Overfilled generator due to a stuck-open fill solenoid or failed water level control

If the generator is overfilled with water, liquid water carries over into the steam cavity along with the steam, producing wet, watery steam and poor cooking performance.

Question 2: What is the recommended maintenance frequency for cleaning condenser coils on commercial refrigeration equipment in a kitchen environment with heavy grease-laden air?

Every 5 years
Annually
Every 3–6 months (Correct answer)
Only when a fault code is triggered

Correct answer: Every 3–6 months

Grease-laden air rapidly clogs condenser coils, and in heavy-use kitchen environments quarterly to semi-annual cleaning is required to maintain efficiency and prevent compressor failure.

Question 3: ASHRAE Standard 90.1 affects commercial food equipment technicians primarily because it:

Governs gas appliance BTU ratings
Sets refrigerant recovery requirements
Sets dishwasher water consumption limits
Establishes minimum energy efficiency requirements for commercial refrigeration and HVAC equipment (Correct answer)

Correct answer: Establishes minimum energy efficiency requirements for commercial refrigeration and HVAC equipment

ASHRAE 90.1 establishes minimum energy efficiency standards that commercial refrigeration equipment must meet, influencing equipment selection and replacement decisions.

Question 4: On a commercial walk-in cooler, a technician finds the evaporator fan running but the evaporator coil is completely encased in ice. The defrost system should be checked for:

Low refrigerant charge
Refrigerant overcharge
Failed defrost heaters, defrost timer/control, or defrost termination thermostat (Correct answer)
Dirty condenser coils

Correct answer: Failed defrost heaters, defrost timer/control, or defrost termination thermostat

A completely iced-over evaporator indicates the defrost cycle is not functioning; failed heaters, a stuck defrost timer, or a faulty termination thermostat are the likely causes.

Question 5: A commercial convection oven fan runs backward (opposite direction). The most likely cause is:

Defective thermostat
Two motor leads have been swapped, reversing the phase for a three-phase motor (Correct answer)
Worn fan blade
Failed capacitor on a single-phase motor

Correct answer: Two motor leads have been swapped, reversing the phase for a three-phase motor

On a three-phase motor, swapping any two of the three power leads reverses the motor's rotation direction.

Question 6: When replacing a hermetic compressor in a commercial reach-in refrigerator, what procedure is MOST critical before brazing the new compressor in place?

Flush the system with refrigerant to remove air
Verify the oil level in the new compressor crankcase
Recover all refrigerant and pull a deep vacuum (Correct answer)
Pressurize the system with nitrogen to 150 psig

Correct answer: Recover all refrigerant and pull a deep vacuum

All refrigerant must be recovered before opening the system, and a deep vacuum must be pulled to remove moisture and non-condensables before recharging.

Question 7: A walk-in cooler compressor short-cycles every 2-3 minutes. After ruling out refrigerant issues, what should the technician check next?

High-pressure cutout switch (Correct answer)
Evaporator fan blade
Door sweep seal
Condenser fan motor capacitor

Correct answer: High-pressure cutout switch

A high-pressure cutout switch tripping repeatedly causes short-cycling and often indicates condenser fouling or airflow restriction.

Question 8: During a refrigerant leak search on commercial equipment, which method is most effective for pinpointing small leaks in tight spaces?

UV dye with a UV lamp
Electronic leak detector
Ultrasonic leak detector (Correct answer)
Bubble solution

Correct answer: Ultrasonic leak detector

Ultrasonic leak detectors can pinpoint small refrigerant leaks in confined spaces by detecting the high-frequency sound of escaping gas.

Question 9: What is the primary purpose of a grease trap on commercial cooking equipment drain connections?

Collect fats, oils, and grease to prevent sewer system blockage (Correct answer)
Filter food particles from drain water
Prevent drain odors from entering the kitchen
Reduce water pressure in drain lines

Correct answer: Collect fats, oils, and grease to prevent sewer system blockage

Grease traps intercept fats, oils, and grease (FOG) from wastewater before it enters the sewer system, preventing blockages and regulatory violations.

Question 10: A commercial refrigeration system is short-cycling on the high-pressure cutout after a condenser coil cleaning. What is the most likely cause?

Low refrigerant charge
Iced evaporator coil
Overcharge of refrigerant introduced during service (Correct answer)
Worn compressor valves

Correct answer: Overcharge of refrigerant introduced during service

If refrigerant was added during service without first checking the charge, an overcharge can cause excessive high-side pressure and short-cycling on the high-pressure cutout.

Question 11: A commercial combi-oven displays an error for high steam chamber pressure. After verifying the drain is clear, what component should be inspected?

The steam generator pressure relief valve and pressure transducer (Correct answer)
The door hinge spring tension
The magnetron assembly
The convection fan belt

Correct answer: The steam generator pressure relief valve and pressure transducer

A stuck-closed pressure relief valve or faulty pressure transducer can cause false or actual over-pressure conditions in the steam chamber.

Question 12: What does superheat indicate in a refrigeration system?

Subcooling at the liquid line
Temperature of the condenser coil
Discharge temperature at the compressor
Temperature rise of vapor above its saturation point (Correct answer)

Correct answer: Temperature rise of vapor above its saturation point

Superheat is the number of degrees the refrigerant vapor is above the boiling point at a given pressure, ensuring no liquid enters the compressor.

Question 13: Why does CFESA recommend that service companies document all repairs with a written service report?

OSHA mandates written repair records for all commercial appliances
The FDA requires service documentation on all food-contact equipment
It is required by the EPA for all food equipment repairs
Documentation protects the company legally, supports warranty claims, and provides a service history for the equipment (Correct answer)

Correct answer: Documentation protects the company legally, supports warranty claims, and provides a service history for the equipment

Detailed service documentation creates a legal record of work performed, supports manufacturer warranty claims, and helps technicians identify recurring problems with specific equipment.

Question 14: How should a commercial food slicer blade be cleaned and sanitized according to food safety standards?

Clean only at end of day
Spray with sanitizer without disassembly
Wipe with a dry cloth after each use
Disassemble, wash, rinse, and sanitize the blade and all food contact surfaces per NSF guidelines (Correct answer)

Correct answer: Disassemble, wash, rinse, and sanitize the blade and all food contact surfaces per NSF guidelines

Food slicer blades must be disassembled, washed, rinsed, and sanitized after every 4 hours of use and at the end of the day per FDA Food Code and NSF requirements.

Question 15: Which refrigerant requires technicians to hold an EPA Section 608 Type II certification to service?

R-134a in small appliances
R-410A in residential split systems
R-404A in commercial refrigeration above 50 lbs (Correct answer)
R-22 in window units

Correct answer: R-404A in commercial refrigeration above 50 lbs

EPA Section 608 Type II certification is required for servicing high-pressure commercial and industrial refrigeration systems containing more than 50 lbs of refrigerant.

Question 16: During a preventive maintenance inspection, a technician finds that a commercial gas oven's door spring tension is insufficient, causing the door to fall open. What is the correct repair approach?

Weld the spring bracket for added strength
Add a door latch catch as a workaround
Replace the door springs with manufacturer-specified components (Correct answer)
Adjust the door hinge pivot bolt to increase friction

Correct answer: Replace the door springs with manufacturer-specified components

Door springs must be replaced with OEM-specified parts to ensure the correct tension that keeps the door sealed and prevents heat loss or burn hazards.

Question 17: NSF/ANSI 4 covers which category of commercial food equipment?

Commercial cooking and hot food holding equipment (Correct answer)
Food preparation equipment
Refrigerators and storage freezers
Spray-type dishwashing machines

Correct answer: Commercial cooking and hot food holding equipment

NSF/ANSI 4 establishes sanitation requirements for commercial cooking and hot food holding and transport equipment.

Question 18: When a service company hires a new technician from a competitor, which precaution is MOST important regarding customer data?

Immediately assign the technician to service the competitor's former customers
Verify the technician signed a non-disclosure agreement with the competitor
Ensure the technician does not use or share confidential customer information from the previous employer (Correct answer)
Ask the technician to bring customer contact lists from the old job

Correct answer: Ensure the technician does not use or share confidential customer information from the previous employer

Using a competitor's confidential customer data constitutes misappropriation of trade secrets and creates significant legal liability.

Question 19: What is the relationship between steam pressure and steam temperature in a commercial steamer?

Lower pressure always produces superheated steam
Pressure and temperature are independent of each other
Higher pressure produces lower steam temperature
Higher pressure produces higher steam temperature (Correct answer)

Correct answer: Higher pressure produces higher steam temperature

Steam follows the saturation curve — as pressure increases, the boiling point and steam temperature rise proportionally.

Question 20: Under OSHA's Lockout/Tagout standard (29 CFR 1910.147), before servicing commercial food equipment a technician must:

Isolate all energy sources, lock them out, and verify zero energy state before beginning work (Correct answer)
Post a warning sign near the equipment
Wear rubber gloves and proceed with power on
Notify the restaurant manager and proceed

Correct answer: Isolate all energy sources, lock them out, and verify zero energy state before beginning work

LOTO procedures require technicians to identify all energy sources, apply lockout devices, and verify zero energy state (test for de-energization) before performing maintenance.

Question 21: A commercial ice machine produces cloudy or opaque ice cubes. What maintenance action should be performed first?

Clean and sanitize the water system and replace the water filter (Correct answer)
Adjust the harvest timer
Increase refrigerant charge
Replace the water inlet valve

Correct answer: Clean and sanitize the water system and replace the water filter

Cloudy ice is typically caused by mineral impurities or biological contamination in the water supply, addressed by cleaning, sanitizing, and filtering the water.

Question 22: When diagnosing a commercial dishwasher that fails to sanitize, what reading should a technician verify using a service thermometer?

Final rinse water temperature at the rack surface (minimum 180°F for high-temp units) (Correct answer)
Incoming water temperature only
Booster heater inlet temperature
Wash tank temperature at the heating element

Correct answer: Final rinse water temperature at the rack surface (minimum 180°F for high-temp units)

Sanitization is verified by confirming final rinse temperature at the rack surface meets the minimum 180°F requirement, as this is where sanitization actually occurs.

Question 23: A commercial refrigerator compressor runs continuously but the cabinet temperature is too warm. After confirming proper refrigerant charge and airflow, the technician should next check:

The compressor motor winding resistance
The door gaskets and thermostat calibration (Correct answer)
The condenser fan blade pitch
The liquid line filter drier color indicator

Correct answer: The door gaskets and thermostat calibration

Leaking door gaskets allow warm air infiltration, and an out-of-calibration thermostat may not cycle the compressor correctly — both cause continuous running without reaching setpoint.

Question 24: Which type of refrigerant leak detection method is BEST suited for identifying the exact location of a small leak in a hard-to-reach area of tubing?

Nitrogen pressure test with soap bubbles
Refrigerant standing pressure test
Electronic leak detector sweep
UV dye inspection with black light (Correct answer)

Correct answer: UV dye inspection with black light

UV dye previously added to the system glows under UV light, pinpointing the exact leak location even in tight or hidden areas.

Question 25: When should a technician consult a manufacturer's Service Bulletin (TSB) in addition to the standard service manual?

Only when the equipment is under active warranty
Service bulletins are for sales staff only and do not apply to field technicians
Only after the repair has failed twice using the standard diagnostic procedure
When diagnosing a known recurring failure mode, identifying a superseded part number, or applying a factory-authorized repair modification not in the original manual (Correct answer)

Correct answer: When diagnosing a known recurring failure mode, identifying a superseded part number, or applying a factory-authorized repair modification not in the original manual

Technical Service Bulletins document field-discovered failure patterns, part number supersessions, firmware updates, and factory-authorized repair procedures that post-date the original manual. Skipping TSBs when diagnosing a chronic or recurring issue risks repeating a known failure pattern that the manufacturer has already identified and resolved.

Question 26: A technician is replacing a gas valve on a commercial griddle. After completing the repair, what is the correct sequence before returning the unit to service?

Light the pilot immediately, then test for leaks with the unit running
Restore gas, check for leaks at connections, then purge and ignite
Purge the line, light the pilot, check for leaks, verify flame appearance (Correct answer)
Check for leaks, purge air from the line, then light the pilot

Correct answer: Purge the line, light the pilot, check for leaks, verify flame appearance

The correct sequence is to purge trapped air, establish the pilot, leak-test all connections, and then verify proper burner flame characteristics.

Question 27: A commercial steamer fails to build pressure. After checking the door gasket seal, the technician should inspect:

The safety relief valve only
The water supply valve, water level probe, and heating elements (Correct answer)
The condensate return line
The steam trap

Correct answer: The water supply valve, water level probe, and heating elements

A steamer that won't build pressure likely has insufficient water (supply valve, level probe malfunction) or insufficient heat input (failed elements) — all must be checked.

Question 28: What condition is indicated when a compressor's suction line frosts heavily all the way back to the compressor?

Low refrigerant charge
Normal operating condition
Overcharge of refrigerant or a flooding TXV (Correct answer)
High ambient temperature

Correct answer: Overcharge of refrigerant or a flooding TXV

Heavy frosting on the suction line extending to the compressor indicates liquid refrigerant is returning to the compressor, risking liquid slugging.

Question 29: Which component in a refrigeration system is responsible for removing heat from the refrigerant?

Compressor
Expansion valve
Evaporator
Condenser (Correct answer)

Correct answer: Condenser

The condenser releases heat absorbed by the refrigerant to the surrounding environment, completing the refrigeration cycle.

Question 30: What is the purpose of a head pressure control valve (also called a flooding valve) on an air-cooled condenser in cold ambient conditions?

Maintain minimum condensing pressure by restricting liquid line flow (Correct answer)
Prevent liquid refrigerant from flooding back to the compressor
Reduce compressor discharge temperature in summer
Control refrigerant flow to a remote condenser

Correct answer: Maintain minimum condensing pressure by restricting liquid line flow

In cold weather, a head pressure control valve maintains minimum condensing pressure by partially flooding the condenser with liquid refrigerant to reduce effective coil surface.

Question 31: What does a megohmmeter (megger) test on a compressor motor winding reveal?

Capacitor condition
Motor efficiency under load
Insulation resistance to detect winding-to-ground faults (Correct answer)
Winding resistance in ohms for continuity check

Correct answer: Insulation resistance to detect winding-to-ground faults

A megohmmeter applies high voltage to test insulation resistance between motor windings and ground, detecting insulation breakdown that can cause ground faults or motor failure.

Question 32: In a commercial refrigeration system, what is the role of the oil separator?

Separate refrigerant from oil in the evaporator
Prevent oil from entering the condenser
Return compressor oil from the discharge line back to the crankcase (Correct answer)
Filter moisture from the oil

Correct answer: Return compressor oil from the discharge line back to the crankcase

The oil separator captures oil discharged with the hot gas and returns it to the compressor crankcase, preventing oil accumulation in the system.

Question 33: A technician measures a high head pressure and normal suction pressure in a walk-in cooler. The most likely cause is:

Stuck open TXV
Low refrigerant charge
Faulty evaporator fan
Dirty condenser coils (Correct answer)

Correct answer: Dirty condenser coils

Dirty condenser coils restrict airflow and heat transfer, causing head pressure to rise above normal operating range.

Question 34: A commercial ice machine produces small, misshapen ice cubes. The most likely cause is:

Faulty ice thickness probe
Condenser fan running backward
Low water pressure or clogged water distribution tube (Correct answer)
Refrigerant overcharge

Correct answer: Low water pressure or clogged water distribution tube

Inadequate water flow through the distribution tube causes incomplete ice cell formation, resulting in small, hollow, or misshapen cubes.

Question 35: A commercial refrigeration condenser fan motor fails. Before replacing it, what should the technician verify about the replacement motor?

The motor frame size is larger than the original
The motor uses the same refrigerant type
The motor is rated for outdoor use only
The motor rotation direction matches the original (Correct answer)

Correct answer: The motor rotation direction matches the original

Condenser fan motors must rotate in the correct direction to move air properly through the condenser coil; wrong rotation causes inadequate heat rejection.

Question 36: What is the purpose of the deliming procedure on a commercial combi oven?

Remove mineral scale deposits from steam-generating components (Correct answer)
Calibrate the cooking thermostat
Clean the convection fan blades
Remove grease buildup from burners

Correct answer: Remove mineral scale deposits from steam-generating components

Deliming removes calcium and mineral scale deposits from steam generators and water circuits to maintain steam output and prevent equipment damage.

Question 37: What is the most effective strategy for a food equipment technician to stay current with rapidly evolving commercial kitchen technology?

Wait for customers to report new equipment failures before researching it
Rely exclusively on experience from previous equipment generations
Pursue ongoing manufacturer training, CFESA continuing education, and subscribe to industry publications (Correct answer)
Only service equipment models they have worked on before

Correct answer: Pursue ongoing manufacturer training, CFESA continuing education, and subscribe to industry publications

Continuous learning through manufacturer training, CFESA CEU programs, and industry publications ensures technicians remain competent as kitchen technology evolves.

Question 38: A gear-driven commercial slicer produces a loud grinding noise only when the carriage is moving. The motor runs quietly at idle. What is the MOST likely cause?

Incorrect blade angle
A failing motor bearing
Worn or damaged carriage drive gears or a dry carriage rail (Correct answer)
Low supply voltage to the motor

Correct answer: Worn or damaged carriage drive gears or a dry carriage rail

Grinding noise that occurs only during carriage movement isolates the problem to the carriage drive mechanism — worn gears or a dry, rough rail.

Question 39: What is the primary purpose of a liquid line filter-drier in a commercial refrigeration system?

Remove moisture and contaminants from the refrigerant (Correct answer)
Separate oil from the refrigerant before the condenser
Increase refrigerant flow velocity to the evaporator
Subcool the liquid refrigerant before the metering device

Correct answer: Remove moisture and contaminants from the refrigerant

A liquid line filter-drier removes moisture, acid, and solid contaminants from the refrigerant to protect the system components.

Question 40: A commercial refrigerator's compressor hums but will not start. The most likely cause on a single-phase unit is:

Low refrigerant charge
Failed start capacitor or start relay (Correct answer)
Open overload protector
High head pressure

Correct answer: Failed start capacitor or start relay

A humming but non-starting compressor on a single-phase unit typically indicates a failed start capacitor or start relay that is not providing the starting torque needed.

Question 41: A HACCP plan identifies the final cooking step in a commercial oven as a Critical Control Point (CCP) for poultry. What is the technician's responsibility when servicing the oven's temperature control system?

The technician must verify and document that the oven achieves and maintains the required CCP temperature accurately, as a calibration error directly compromises the critical limit (Correct answer)
No special obligation exists; the chef verifies cooking temperature independently with a probe thermometer
The technician must notify the local health department before performing any work on CCP-associated equipment
Only an NSF-certified food safety auditor may verify oven temperature after service; the technician documents the repair only

Correct answer: The technician must verify and document that the oven achieves and maintains the required CCP temperature accurately, as a calibration error directly compromises the critical limit

When servicing equipment identified as a CCP in a HACCP plan, the technician's calibration verification directly affects food safety. If the oven reads 165°F but actually delivers 150°F, poultry is undercooked and pathogen destruction is not achieved. Technicians must verify calibration accuracy and document it so HACCP records remain valid.

Question 42: What is the typical symptom of a failing motor capacitor in a commercial mixer?

Uneven mixing of ingredients
The mixer not starting or struggling to start (Correct answer)
Overheating of the mixer’s external body
Excessive noise during operation

Correct answer: The mixer not starting or struggling to start

Motor capacitors provide the initial burst of electricity needed to start an electric motor and help maintain its efficiency during operation. If a capacitor fails, the motor may not receive enough starting torque, resulting in it humming but not turning, or struggling to get up to speed. This is a classic indicator of a faulty capacitor.

Question 43: What is the AHJ's role in commercial food equipment installation?

Manufacture and certify equipment
Set NSF standards
Enforce local building and safety codes and approve installations (Correct answer)
Issue CFESA certifications

Correct answer: Enforce local building and safety codes and approve installations

The Authority Having Jurisdiction (AHJ) enforces local building, fire, health, and safety codes and has final approval authority over commercial equipment installations.

Question 44: Subcooling in a refrigeration system refers to:

Cooling liquid refrigerant below its condensing temperature (Correct answer)
Reducing compressor discharge temperature
Operating the evaporator below freezing
Cooling the suction line below ambient

Correct answer: Cooling liquid refrigerant below its condensing temperature

Subcooling ensures the liquid refrigerant is cooled below its condensing temperature, preventing flash gas before the expansion device.

Question 45: A food establishment is cited for having a reach-in cooler that does not maintain proper temperature. Which regulatory body most likely issued the citation?

Local health department (Correct answer)
NSF International
ASHRAE
CFESA

Correct answer: Local health department

Local or state health departments conduct inspections of food service establishments and cite violations of food safety codes including temperature requirements.

Question 46: A technician finds frost forming uniformly across the entire evaporator coil in a walk-in cooler. What is the most likely cause?

Overcharge of refrigerant
Low refrigerant charge
Defective defrost heater
Restricted airflow across the coil (Correct answer)

Correct answer: Restricted airflow across the coil

Uniform frost across the entire evaporator typically indicates restricted airflow, while low charge usually causes frost only on part of the coil.

Question 47: During a preventive maintenance visit on a commercial ice machine, a technician should routinely perform:

Replace all water hoses
Clean condenser coils, sanitize water system, and inspect water filters and float valve (Correct answer)
Replace the compressor every PM
Replace refrigerant charge

Correct answer: Clean condenser coils, sanitize water system, and inspect water filters and float valve

Ice machine PM includes cleaning condenser coils, sanitizing the water distribution system, and inspecting filters and float valves to maintain performance and sanitation.

Question 48: A CFESA-certified technician is asked to service a Type I commercial hood exhaust system. Which standard governs the fire suppression and ventilation requirements for this equipment?

NFPA 101
NFPA 13
NFPA 96 (Correct answer)
NFPA 72

Correct answer: NFPA 96

NFPA 96, Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations, governs the design, installation, operation, inspection, and maintenance of commercial cooking ventilation and fire suppression systems.

Question 49: What is the typical evaporator temperature range for a commercial ice cream freezer (hardening cabinet)?

-10°F to 0°F
0°F to 15°F
20°F to 35°F
-40°F to -20°F (Correct answer)

Correct answer: -40°F to -20°F

Hardening cabinets require very low evaporator temperatures, typically -40°F to -20°F, to rapidly freeze and maintain ice cream at proper hardness.

Question 50: What is the function of a pressure differential switch on a commercial ice machine?

To regulate water flow to the ice-making grid
To cycle the harvest valve on and off
To control the water pump speed
To detect a dirty condenser or refrigerant restriction and shut the unit down (Correct answer)

Correct answer: To detect a dirty condenser or refrigerant restriction and shut the unit down

A pressure differential switch monitors the difference between high and low side pressures and shuts down the machine if the spread indicates a problem like a dirty condenser.

Question 51: What causes a compressor to short cycle in a commercial refrigeration unit?

High ambient temperature
Low refrigerant charge causing rapid pressure equalization (Correct answer)
Dirty evaporator coil
Oversize expansion valve

Correct answer: Low refrigerant charge causing rapid pressure equalization

A low refrigerant charge can cause the low-pressure control to cycle the compressor on and off rapidly as pressures equalize quickly.

Question 52: What is the primary refrigerant used in most modern commercial food equipment refrigeration systems?

R-22
R-410A
R-134a
R-404A (Correct answer)

Correct answer: R-404A

R-404A is widely used in commercial food refrigeration due to its compatibility with medium and low temperature applications.

Question 53: When performing a gas leak test on a newly installed commercial range, which substance is approved for use on gas connections?

Listed leak detection solution or electronic detector (Correct answer)
Compressed air
Soap and water solution
An electronic leak detector only

Correct answer: Listed leak detection solution or electronic detector

NFPA 54 and manufacturer guidelines permit the use of listed leak detection solution or an approved electronic detector to check connections.

Question 54: Which OSHA standard specifically covers electrical safety requirements that food equipment technicians must follow?

29 CFR 1910.119 (PSM)
29 CFR 1910.147 (Lockout/Tagout)
29 CFR 1910.303 (Electrical General Requirements)
Both 29 CFR 1910.147 and 1910.303 (Correct answer)

Correct answer: Both 29 CFR 1910.147 and 1910.303

Food equipment technicians must comply with both OSHA 29 CFR 1910.147 (control of hazardous energy/LOTO) and 1910.303 (general electrical safety requirements).

Question 55: Which NSF standard specifically governs the design and construction of commercial warewashing equipment?

NSF/ANSI 2
NSF/ANSI 18
NSF/ANSI 4
NSF/ANSI 3 (Correct answer)

Correct answer: NSF/ANSI 3

NSF/ANSI 3 covers the sanitation requirements for commercial warewashing equipment including dishwashers, glasswashers, and pot washers.

Question 56: A refrigerated prep table shows ice buildup on the evaporator coil between scheduled defrosts. What condition does this most likely indicate?

Excessive moisture infiltration from a failing door seal (Correct answer)
Defrost heater operating too long
Restriction in the liquid line filter-drier
Overcharge of refrigerant

Correct answer: Excessive moisture infiltration from a failing door seal

A failing door gasket allows warm, moist ambient air to enter, which freezes on the evaporator coil faster than scheduled defrost cycles can clear it.

Question 57: A commercial dishwasher's final rinse temperature consistently reads 160°F instead of the required 180°F. After confirming the booster heater element is functional, what should be checked next?

Detergent dispenser timing
Spray arm nozzle blockage
Door switch adjustment
Incoming water pressure and flow rate to the booster (Correct answer)

Correct answer: Incoming water pressure and flow rate to the booster

Insufficient water flow through the booster heater means the water does not spend enough time in contact with the heating element to reach 180°F.

Question 58: Which federal agency enforces the Clean Air Act Section 608 regulations governing refrigerant handling by commercial food equipment technicians?

OSHA
FDA
DOE
EPA (Correct answer)

Correct answer: EPA

The U.S. Environmental Protection Agency (EPA) enforces Section 608 of the Clean Air Act, which regulates refrigerant recovery, recycling, and reclamation.

Question 59: During startup, a steam kettle pressure gauge reads normal but the kettle is not heating. Which diagnostic step should be performed first?

Verify the condensate return line
Inspect the safety relief valve
Check the steam trap for failure
Confirm the steam solenoid valve is opening (Correct answer)

Correct answer: Confirm the steam solenoid valve is opening

If pressure is present but heat is absent, the steam solenoid valve may be stuck closed and preventing steam from entering the jacket.

Question 60: A commercial ice machine produces hollow or incomplete cubes. Refrigerant charge and water supply are confirmed normal. What is the most likely cause?

Faulty harvest solenoid
Low water distributor flow or clogged water nozzles (Correct answer)
Excessive ambient temperature
Failed bin thermostat

Correct answer: Low water distributor flow or clogged water nozzles

Clogged water nozzles in the distributor reduce water coverage over the evaporator plate, resulting in hollow or incomplete ice cube formation.

Question 61: A reach-in display case has a warm cabinet temperature but the evaporator fan is running and no ice is visible on the coil. Suction pressure is normal. What should be checked FIRST?

Refrigerant charge level
Condenser coil cleanliness
Door gaskets and seals for air infiltration (Correct answer)
Compressor valve efficiency

Correct answer: Door gaskets and seals for air infiltration

When the refrigeration system appears to operate normally but cabinet temperature is warm, damaged door gaskets allowing warm air infiltration is the most common cause.

Question 62: When recovering refrigerant from commercial equipment, technicians must comply with which EPA regulation?

OSHA 29 CFR 1910.119
Title V of the Clean Water Act
Section 608 of the Clean Air Act (Correct answer)
Section 404 of the Safe Drinking Water Act

Correct answer: Section 608 of the Clean Air Act

EPA Section 608 requires technicians to recover refrigerants using certified equipment and prohibits intentional venting of regulated refrigerants.

Question 63: During a PM visit on a commercial deep fryer, the technician notices the high-limit thermostat has tripped repeatedly. After resetting, what should be inspected before returning the unit to service?

Oil level, thermostat calibration, and burner/element heat distribution (Correct answer)
The oil filtration pump motor
The pilot light orifice
The flue exhaust screen

Correct answer: Oil level, thermostat calibration, and burner/element heat distribution

Repeated high-limit trips indicate the fryer is overheating, which can be caused by low oil level, a miscalibrated operating thermostat, or uneven heat causing hot spots.

Question 64: What is the recommended maintenance interval for changing the oil in a commercial floor-type mixer?

Every 30 days
Every 6 months or per manufacturer specification (Correct answer)
Only when noise is detected
Annually regardless of use

Correct answer: Every 6 months or per manufacturer specification

Commercial mixer gearboxes require oil changes every 6 months or per the manufacturer's schedule to maintain lubrication and prevent gear wear.

Question 65: What is the purpose of a receiver in a commercial refrigeration system?

Store extra refrigerant and ensure liquid feed to the expansion device (Correct answer)
Separate oil from the refrigerant
Filter moisture from the refrigerant
Measure refrigerant flow rate

Correct answer: Store extra refrigerant and ensure liquid feed to the expansion device

The receiver stores liquid refrigerant to accommodate system load variations and ensures a steady liquid supply to the expansion device.

Question 66: Which component in a commercial reach-in cooler's electrical circuit is designed to open the circuit if the current exceeds a rated value due to a fault?

Run capacitor
Start relay
Overload relay (Correct answer)
Transformer

Correct answer: Overload relay

An overload relay monitors motor current and opens the circuit if current exceeds the set threshold, protecting the motor from heat damage.

Question 67: Which financial metric best measures how efficiently a service company converts revenue into profit after all operating expenses?

Accounts receivable turnover
Current ratio
Net profit margin (Correct answer)
Gross margin

Correct answer: Net profit margin

Net profit margin reflects what percentage of revenue remains as profit after all expenses, including overhead and taxes.

Question 68: What does a commercial warewasher's booster heater do?

Preheat the wash water
Maintain water temperature in the tank between cycles
Heat the detergent solution
Raise incoming water temperature to the required 180°F final rinse temperature (Correct answer)

Correct answer: Raise incoming water temperature to the required 180°F final rinse temperature

A booster heater raises the building hot water supply (typically 120°F) to the 180°F minimum required for sanitizing the final rinse in high-temperature dishwashers.

Question 69: What does a megohmmeter (megger) test measure in commercial food equipment motors?

Starting capacitor capacitance
Winding continuity at operating voltage
Insulation resistance between windings and motor frame (Correct answer)
Motor RPM under load

Correct answer: Insulation resistance between windings and motor frame

A megger applies high DC voltage to measure the insulation resistance of motor windings, detecting moisture or deterioration before full failure.

Question 70: What does R-454B refrigerant represent in terms of regulatory compliance?

A low-GWP HFO blend approved as an A2L refrigerant to replace R-410A (Correct answer)
A natural refrigerant requiring special handling only in Europe
A refrigerant banned under SNAP for commercial use
A banned ozone-depleting substance

Correct answer: A low-GWP HFO blend approved as an A2L refrigerant to replace R-410A

R-454B is a low global warming potential (GWP) A2L refrigerant blend approved by the EPA SNAP program as a replacement for R-410A in commercial applications.

Question 71: A technician finds a commercial refrigerator compressor running continuously with the box temperature above setpoint. Suction pressure is low and superheat is high. What does this indicate?

Overcharge of refrigerant
Faulty condenser fan
Undercharge of refrigerant or refrigerant leak (Correct answer)
Stuck-open expansion valve

Correct answer: Undercharge of refrigerant or refrigerant leak

Low suction pressure combined with high superheat is a classic indicator of insufficient refrigerant in the system, pointing to a leak or undercharge.

Question 72: During installation of a commercial oven, the technician measures 208V between L1 and L2, 208V between L2 and L3, but only 120V between L1 and L3. What does this indicate?

The oven is properly connected to a single-phase supply
An open or high-resistance fault on L3 in the supply panel or connections (Correct answer)
The oven requires a neutral wire and this is normal
Phase rotation is reversed and must be corrected

Correct answer: An open or high-resistance fault on L3 in the supply panel or connections

Unequal three-phase voltage readings like this pattern indicate a problem with one supply leg — an open connection or bad breaker on L3.

Question 73: When performing PM on a commercial tilting skillet (braising pan), a technician should lubricate the:

Thermostat bulb
Tilt mechanism pivot points and gear assembly per manufacturer specifications (Correct answer)
Heating elements
Exterior stainless steel surface

Correct answer: Tilt mechanism pivot points and gear assembly per manufacturer specifications

The tilt mechanism pivot points and gear assembly require periodic lubrication with food-grade grease to ensure smooth, safe operation and prevent premature wear.

Question 74: In a commercial pressurized steamer, what is the typical operating pressure range?

100 to 150 PSI
5 to 15 PSI (Correct answer)
25 to 50 PSI
0.5 to 1 PSI

Correct answer: 5 to 15 PSI

Commercial pressurized steamers typically operate between 5 and 15 PSI, which corresponds to steam temperatures of approximately 228°F to 250°F.

Question 75: According to the FDA Food Code, what is the minimum internal temperature that a commercial combi-oven must achieve when cooking poultry?

145°F (63°C)
170°F (77°C)
155°F (68°C)
165°F (74°C) (Correct answer)

Correct answer: 165°F (74°C)

The FDA Food Code requires poultry to reach a minimum internal temperature of 165°F (74°C) for at least 15 seconds to eliminate pathogens such as Salmonella.

Question 76: The purpose of a crankcase pressure regulator (CPR) valve in a refrigeration system is to:

Regulate oil pressure in the crankcase
Prevent high discharge pressure
Limit suction pressure entering the compressor during pulldown (Correct answer)
Control head pressure during cold ambient conditions

Correct answer: Limit suction pressure entering the compressor during pulldown

A CPR valve prevents excessive suction pressure from reaching the compressor during initial pulldown, protecting the motor from overload.

Question 77: When checking a three-phase motor for balance, what should the amperage readings between the three legs be?

Sequential increase from leg 1 to leg 3
Within 10% of each other (Correct answer)
Exactly equal on all three legs
The center leg should read 50% higher

Correct answer: Within 10% of each other

Amperage imbalance greater than 10% between legs indicates a problem with the power supply or the motor windings.

Question 78: What causes cavitation in a commercial dishwasher pump?

Excess water pressure
Insufficient water supply, air entrainment, or clogged intake strainer (Correct answer)
Hot water above 180°F
Worn wash arm bearings

Correct answer: Insufficient water supply, air entrainment, or clogged intake strainer

Cavitation occurs when the pump cannot draw sufficient water, causing vapor bubbles that collapse violently and damage pump impellers over time.

Question 79: What is the purpose of a 'dispatch matrix' in a service operation?

A chart showing customer payment history
A grid for scheduling technician vacation time
A tracking system for parts inventory
A system for routing and prioritizing service calls based on technician location, skills, and urgency (Correct answer)

Correct answer: A system for routing and prioritizing service calls based on technician location, skills, and urgency

A dispatch matrix optimizes technician assignment by matching the right technician to each call based on proximity, skill set, and call priority.

Question 80: When performing maintenance on a commercial garbage disposal, what safety step must be completed before reaching into the grinding chamber?

Run water through the unit for 30 seconds to flush debris
Turn the reset button to the off position
Disconnect electrical power and verify it is locked out/tagged out (Correct answer)
Switch the unit to reverse mode

Correct answer: Disconnect electrical power and verify it is locked out/tagged out

LOTO (lockout/tagout) is mandatory before any hands-on maintenance inside a disposal to prevent accidental activation of the cutting mechanism.

Question 81: A commercial ice cream machine produces soft, runny product. The most probable cause is:

Beater motor running too fast
Refrigeration system underperforming or mix overrun too high (Correct answer)
Excess glycol in the freezing cylinder
Mix temperature too cold

Correct answer: Refrigeration system underperforming or mix overrun too high

Soft or runny ice cream product indicates the freezing cylinder is not reaching proper draw temperature, typically caused by refrigeration underperformance or incorrect mix overrun.

Question 82: When performing a load test on a commercial food equipment power circuit, what does a significant voltage drop between the panel and the equipment indicate?

Normal voltage variation within acceptable tolerance
Excessive resistance in the supply conductors, connections, or breaker due to loose or corroded contacts (Correct answer)
The equipment is drawing below rated amperage
The supply transformer is undersized

Correct answer: Excessive resistance in the supply conductors, connections, or breaker due to loose or corroded contacts

Voltage drop under load reveals high resistance in the circuit path — commonly caused by loose terminals, corroded connections, or an undersized or failing circuit breaker.

Question 83: Per OSHA 29 CFR 1910.147 (Lockout/Tagout), when must a service technician apply a personal lockout device to commercial food equipment?

Only when the equipment owner requests it in writing
Whenever unexpected energization or release of stored energy could cause injury during servicing (Correct answer)
When servicing equipment with more than one energy source
Only when working on electrical components above 480 volts

Correct answer: Whenever unexpected energization or release of stored energy could cause injury during servicing

LOTO is required any time servicing or maintenance could expose a worker to unexpected energization, startup, or release of stored energy regardless of voltage level.

Question 84: When repairing a commercial walk-in cooler door that will not seal properly, which component should be inspected first?

The condenser coil fins
The defrost timer setting
The evaporator fan motor
The door gasket and cam-lift hinge adjustment (Correct answer)

Correct answer: The door gasket and cam-lift hinge adjustment

A worn or misaligned gasket and improper cam-lift hinge adjustment are the primary causes of poor door sealing on walk-in coolers.

Question 85: A commercial convection oven heats unevenly, with the back hotter than the front. Which component is most likely failing?

Convection fan motor (Correct answer)
Door gasket
Thermostat sensor
Igniter assembly

Correct answer: Convection fan motor

A failing convection fan motor reduces or disrupts airflow, causing uneven heat distribution within the oven cavity.

Question 86: What is the primary function of a relay in electrical systems of commercial food equipment?

To store electrical energy
To control a high-power circuit with a low-power signal (Correct answer)
To measure temperature changes
To act as a grounding device

Correct answer: To control a high-power circuit with a low-power signal

Relays act as electrical switches, allowing a small electrical current to control a much larger current or voltage circuit. In commercial food equipment, they are often used to safely switch on/off high-power components like heating elements or motors, protecting sensitive control circuits from high loads.

Question 87: What is the correct method to test a commercial heating element for an open circuit?

Use a clamp meter with power on
Apply power and measure temperature rise
Apply 120V and check for heat output
Use a multimeter set to resistance (ohms) to measure element resistance with power off (Correct answer)

Correct answer: Use a multimeter set to resistance (ohms) to measure element resistance with power off

An ohmmeter measures the element's resistance with power disconnected; an open circuit reads infinite (OL) resistance, confirming the element has failed.

Question 88: What does a refrigeration system's COP (Coefficient of Performance) measure?

Compressor efficiency in horsepower
Ratio of cooling effect to energy input (Correct answer)
Condenser heat rejection rate
Refrigerant mass flow rate

Correct answer: Ratio of cooling effect to energy input

COP measures refrigeration system efficiency by dividing the cooling capacity by the power input, with higher values indicating greater efficiency.

Question 89: What does 'accounts receivable aging' refer to in service business management?

The process of archiving old customer records
The depreciation schedule for service vehicles
Tracking the age of equipment under service contracts
A report categorizing unpaid invoices by how long they have been outstanding (Correct answer)

Correct answer: A report categorizing unpaid invoices by how long they have been outstanding

Accounts receivable aging reports group outstanding invoices by time periods to help identify collection problems.

Question 90: What is the purpose of a CFESA Factory Authorized Service (FAS) program?

Regulate CFESA membership dues
Provide free parts to certified technicians
Authorize service companies to perform warranty repairs on behalf of equipment manufacturers (Correct answer)
Set technician wage standards

Correct answer: Authorize service companies to perform warranty repairs on behalf of equipment manufacturers

Factory Authorized Service programs authorize qualified service companies to perform in-warranty repairs on behalf of equipment manufacturers, ensuring quality service.

Question 91: What is the function of a crankcase pressure regulator (CPR) valve in a commercial refrigeration system?

Maintain head pressure during low ambient temperatures
Control refrigerant flow to multiple evaporators
Regulate discharge pressure during high ambient conditions
Prevent compressor overload during pulldown by limiting suction pressure (Correct answer)

Correct answer: Prevent compressor overload during pulldown by limiting suction pressure

A CPR valve limits the maximum suction pressure entering the compressor to prevent motor overload during high-load pulldown conditions.

Question 92: A tilting braising pan's electric heating elements show correct resistance but the unit heats unevenly. What is the most probable cause?

Faulty temperature probe location
Air pockets or degraded thermal contact between elements and the pan bottom (Correct answer)
Failed contactor
Incorrect voltage supply

Correct answer: Air pockets or degraded thermal contact between elements and the pan bottom

Even with electrically sound elements, poor thermal contact caused by air gaps or warped surfaces results in uneven heat transfer to the pan bottom.

Question 93: A commercial ice machine produces small, cloudy ice cubes. What is the MOST likely cause?

Low water pressure to the machine
Faulty harvest temperature sensor
High mineral content in the water supply (Correct answer)
Refrigerant overcharge in the system

Correct answer: High mineral content in the water supply

High mineral content (hard water) causes cloudy, small ice cubes because minerals become trapped in the ice matrix as water freezes.

Question 94: Under ASHRAE Standard 15, what is the maximum allowable refrigerant concentration limit (RCL) used to determine if a machinery room is required?

The maximum charge allowed per ton of cooling capacity
The concentration at which refrigerant vapor becomes toxic to humans
The threshold at which refrigerant becomes flammable
The refrigerant concentration that would occur if the entire system charge were released into the occupied space (Correct answer)

Correct answer: The refrigerant concentration that would occur if the entire system charge were released into the occupied space

The RCL is calculated by dividing the total system refrigerant charge by the volume of the smallest occupied space to determine if that concentration exceeds safety thresholds.

Question 95: A commercial convection oven heats unevenly — hot on one side and cool on the other. After confirming the fan operates, the technician should check:

The thermostat probe location
Gas supply pressure only
The door gasket on the cool side only
Individual heating elements or burner sections for open circuits or uneven output (Correct answer)

Correct answer: Individual heating elements or burner sections for open circuits or uneven output

Uneven heating in a convection oven is often caused by a failed heating element or burner on one side; checking individual elements for open circuits isolates the faulty component.

Question 96: In a commercial refrigeration system using an electronic expansion valve (EEV), which parameter does the controller primarily modulate to maintain proper superheat?

Evaporator fan speed
Compressor speed
Valve opening percentage (Correct answer)
Condenser fan speed

Correct answer: Valve opening percentage

The EEV controller adjusts the valve opening percentage based on superheat sensor feedback to maintain the target superheat setpoint.

Question 97: A commercial steam kettle is producing inconsistent temperatures. The first component to check is:

The mixer attachment
The drain valve
The jacket pressure gauge and steam inlet pressure (Correct answer)
The steam trap

Correct answer: The jacket pressure gauge and steam inlet pressure

Inconsistent steam kettle temperatures are often caused by low or fluctuating steam supply pressure; checking the jacket pressure gauge and inlet pressure is the first diagnostic step.

Question 98: A commercial refrigerator evaporator fan motor runs but the unit is not maintaining temperature. After checking refrigerant charge, the next item to inspect is:

The compressor oil level
The condenser fan motor
The evaporator coil for ice blockage and defrost system operation (Correct answer)
The door hinges

Correct answer: The evaporator coil for ice blockage and defrost system operation

An evaporator coil blocked with ice restricts airflow and heat transfer; a faulty defrost system is a common cause of inadequate cooling despite a properly charged system.

Question 99: A combi oven's humidity sensor is suspected to be faulty. Which symptom would most directly point to a failed humidity sensor?

Oven fails to reach temperature setpoint
Steam injection does not match the programmed humidity level during cooking (Correct answer)
Door latch does not engage properly
The oven displays an error code for the heating element

Correct answer: Steam injection does not match the programmed humidity level during cooking

The humidity sensor provides feedback that controls steam injection; a failed sensor means the oven cannot regulate or verify actual humidity levels during cooking.

Question 100: A technician is preparing a resume to apply for a senior service technician role. Which credential should be most prominently featured?

CFESA certification with the specific credential earned (Correct answer)
CPR/First Aid card
A manufacturer's product awareness certificate
High school diploma

Correct answer: CFESA certification with the specific credential earned

CFESA certification is the industry's recognized professional credential and should be prominently featured when applying for senior technical roles.

CFESA Certified Food Equipment Service Technician Exam

The CFESA (Commercial Food Equipment Service Association) certification exam validates technical competency for commercial food equipment service technicians. The exam covers refrigeration systems, gas equipment safety and operation, preventive maintenance, industry standards and regulations, and diagnostic troubleshooting. Candidates must demonstrate hands-on knowledge of servicing and repairing commercial cooking, refrigeration, and food preparation equipment used in professional kitchens.

100

Questions

120 min

Time Limit

70%

To Pass

Checking for saved progress...

Exam Rules

You can skip questions and return to them later
Flag questions for review before submitting
No feedback shown until you submit the entire exam
Unanswered questions count as wrong — answer everything
10 pretest questions are mixed in and don't affect your score
Timer auto-submits when time runs out
Your progress is auto-saved every 30 seconds