CFESA Certified Food Equipment Service Technician Exam — Questions and Answers

Question 1: A commercial refrigeration condenser fan motor fails. Before replacing it, what should the technician verify about the replacement motor?

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

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 2: What is the purpose of an atmospheric burner's primary air shutter on commercial gas cooking equipment?

Regulate pilot flame size
Control secondary air above the burner
Control gas flow to the burner
Adjust the ratio of air mixed with gas before combustion (Correct answer)

Correct answer: Adjust the ratio of air mixed with gas before combustion

The primary air shutter adjusts the amount of air mixed with gas at the venturi before the burner, controlling the air-gas mixture for proper combustion.

Question 3: What is the purpose of the deliming procedure on a commercial combi oven?

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

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 4: Which refrigerant property is measured by a superheat reading at the evaporator outlet?

The subcooling of refrigerant leaving the condenser
The enthalpy difference across the compressor
The vapor temperature above its saturation point at that pressure (Correct answer)
The amount of liquid refrigerant remaining in the evaporator

Correct answer: The vapor temperature above its saturation point at that pressure

Superheat is the temperature of refrigerant vapor above its saturation (boiling) temperature at a given pressure, confirming all refrigerant has vaporized.

Question 5: A technician is diagnosing a commercial steamer that produces steam but the cooking cavity temperature is below specification. What should be checked?

Drain line flow rate
Control board firmware version
Water hardness levels
Steam generator output pressure and door seal integrity (Correct answer)

Correct answer: Steam generator output pressure and door seal integrity

Inadequate steam generator pressure output or a leaking door seal allows steam to escape, reducing cavity temperature below the required cooking specification.

Question 6: When checking electrical connections in commercial food equipment during preventive maintenance, which condition requires immediate correction?

Strain relief fittings on power cords
Wire numbers or labels on conductors
Terminals with anti-oxidant compound applied
Discolored or heat-blackened wire insulation near a terminal (Correct answer)

Correct answer: Discolored or heat-blackened wire insulation near a terminal

Discolored or heat-damaged insulation near terminals indicates a high-resistance connection causing excessive heat, which is a fire and equipment failure risk.

Question 7: A technician is preparing a resume to apply for a senior service technician role. Which credential should be most prominently featured?

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

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.

Question 8: When a technician must condemn a piece of commercial cooking equipment as beyond economical repair, what should the written report include?

A recommendation for a specific competing brand
Only the technician's opinion without supporting data
Only the customer's verbal description of the problem
Specific failure findings, estimated repair cost vs. replacement cost, and safety concerns (Correct answer)

Correct answer: Specific failure findings, estimated repair cost vs. replacement cost, and safety concerns

A complete condemnation report with cost comparisons and safety findings helps the customer make an informed replacement decision.

Question 9: 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?

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

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

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

Correct answer: NSF/ANSI 3

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

Question 11: Which of the following is a critical component of a successful customer relationship management (CRM) strategy in the commercial food equipment service industry?

Increasing the frequency of sales pitches
Tracking customer interactions and service history (Correct answer)
Limiting customer feedback
Reducing the number of service calls

Correct answer: Tracking customer interactions and service history

A robust CRM strategy involves systematically recording and analyzing all customer interactions, including service calls, repair histories, and preferences. This detailed information allows businesses to understand customer needs better, personalize service, anticipate future requirements, and proactively address issues, leading to improved customer satisfaction and loyalty.

Question 12: What is the primary function of a metering pump on a commercial dishwasher?

Automatically dispense precise amounts of detergent or sanitizer into the wash or rinse water (Correct answer)
Meter steam into the wash tank
Control water flow to the spray arms
Regulate final rinse pressure

Correct answer: Automatically dispense precise amounts of detergent or sanitizer into the wash or rinse water

Metering pumps automatically inject calibrated amounts of chemical detergent or sanitizer into the dishwasher at the correct point in the wash cycle.

Question 13: When performing PM on a commercial tilting skillet (braising pan), a technician should lubricate the:

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

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 14: Under NFPA 70 (NEC), what is the maximum allowable voltage for a single-phase commercial kitchen appliance circuit in the United States?

As specified by equipment nameplate and AHJ (Correct answer)
120V
208V
240V

Correct answer: As specified by equipment nameplate and AHJ

The NEC requires that equipment be installed per its nameplate rating and the local Authority Having Jurisdiction (AHJ) may impose additional requirements.

Question 15: When calculating a technician's billable efficiency rate, which formula is correct?

Total hours worked divided by hours available
Billable hours divided by total hours available, multiplied by 100 (Correct answer)
Number of jobs completed divided by working days
Revenue generated divided by hourly rate

Correct answer: Billable hours divided by total hours available, multiplied by 100

Billable efficiency (utilization) rate = billable hours ÷ available hours × 100, showing what percentage of time generates revenue.

Question 16: What is the purpose of a receiver in a commercial refrigeration system?

Filter moisture from the refrigerant
Separate oil from the refrigerant
Store extra refrigerant and ensure liquid feed to the expansion device (Correct answer)
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 17: During a refrigerant leak search on commercial equipment, which method is most effective for pinpointing small leaks in tight spaces?

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

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 18: A technician who has been servicing food equipment for 15 years is considering transitioning to a manufacturer's field service engineer role. What advantage does CFESA certification provide in this transition?

It guarantees a salary match from the manufacturer
It provides a direct employment referral through CFESA
It demonstrates industry-recognized competency and professionalism that manufacturers value in field staff (Correct answer)
It waives the need for any manufacturer-specific training

Correct answer: It demonstrates industry-recognized competency and professionalism that manufacturers value in field staff

CFESA certification signals to manufacturers that the technician meets a validated industry standard, making them a more credible candidate for field engineer positions.

Question 19: 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)
Reduce compressor discharge temperature in summer
Prevent liquid refrigerant from flooding back to the compressor
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 20: A technician measures 24 VAC at the control board output but a gas valve does not open. What is the correct next diagnostic action?

Inspect the flue for blockage
Increase gas supply pressure
Replace the control board
Check resistance across the gas valve coil terminals (Correct answer)

Correct answer: Check resistance across the gas valve coil terminals

Measuring coil resistance confirms whether the gas valve solenoid is open-circuited, shorted, or within specification before condemning the valve.

Question 21: Which standard establishes the energy efficiency requirements that commercial refrigerators must meet to qualify for the ENERGY STAR program?

NSF/ANSI 7
ASHRAE 90.1
AHRI Standard 1200
DOE 10 CFR Part 431 (Correct answer)

Correct answer: DOE 10 CFR Part 431

DOE 10 CFR Part 431 sets the federal minimum energy efficiency standards for commercial refrigeration equipment, which serve as the baseline for ENERGY STAR qualification.

Question 22: What does 'accounts receivable aging' refer to in service business management?

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

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 23: What does a high discharge pressure combined with a normal or low suction pressure indicate in a commercial refrigeration system?

Restricted metering device
Dirty or blocked condenser coil (Correct answer)
Compressor valve failure
Low refrigerant charge

Correct answer: Dirty or blocked condenser coil

A dirty condenser reduces heat rejection efficiency, causing discharge pressure to rise while suction pressure remains normal or slightly low.

Question 24: When performing maintenance on a commercial garbage disposal, what safety step must be completed before reaching into the grinding chamber?

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

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 25: A solenoid valve on a commercial steamer's water fill circuit fails to open. Which symptom would you most likely observe?

Steam escapes from the door gasket continuously
Generator runs dry and the low-water cutoff shuts down the unit (Correct answer)
Steam pressure rises above the set point
Steamer overheats and trips the high-limit thermostat

Correct answer: Generator runs dry and the low-water cutoff shuts down the unit

If the fill solenoid won't open, no water enters the generator; the existing water boils off, triggering the low-water safety cutoff to protect the heating elements.

Question 26: When recovering refrigerant from commercial equipment, technicians must comply with which EPA regulation?

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

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

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

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 28: Which type of expansion device maintains a constant evaporator pressure regardless of load?

Thermostatic expansion valve (TXV)
Capillary tube
Automatic expansion valve (AXV) (Correct answer)
Electronic expansion valve (EEV)

Correct answer: Automatic expansion valve (AXV)

The automatic expansion valve (AXV) maintains a constant evaporator pressure by responding to pressure changes at the valve outlet.

Question 29: 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 30: What diagnostic information does a pressure-temperature (P-T) chart provide to a refrigeration technician?

The saturation temperature of a refrigerant at a given pressure (Correct answer)
Refrigerant oil viscosity requirements
Head pressure limits for specific ambient temperatures
Compressor motor amp draw at various pressures

Correct answer: The saturation temperature of a refrigerant at a given pressure

A P-T chart correlates refrigerant pressure to its saturation (boiling/condensing) temperature, allowing technicians to determine evaporating and condensing temperatures from gauge readings.

Question 31: A steam kettle is producing insufficient steam pressure. After confirming adequate water supply, what is the next diagnostic step?

Replace the heating elements immediately
Check and clean the steam generator scale buildup and inspect the safety valve (Correct answer)
Inspect the lid gasket only
Adjust the thermostat to maximum

Correct answer: Check and clean the steam generator scale buildup and inspect the safety valve

Scale buildup in the steam generator reduces heat transfer efficiency, and a faulty safety valve can bleed off pressure before it builds properly.

Question 32: A commercial meat slicer's blade drive belt shows glazing and cracking during a PM inspection. The unit is still operational. What action should the technician take?

Document the finding and monitor for another 90 days
Replace the belt immediately before returning the unit to service (Correct answer)
Schedule belt replacement at the next available PM
Apply belt dressing compound to restore friction

Correct answer: Replace the belt immediately before returning the unit to service

A glazed and cracked drive belt is at imminent risk of failure; continued operation risks the blade stopping unexpectedly or the belt breaking during use, creating a safety hazard.

Question 33: What is the primary refrigerant used in most modern commercial food equipment refrigeration systems?

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

Correct answer: R-404A

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

Question 34: What is the recommended maintenance frequency for cleaning condenser coils on commercial refrigeration equipment in a kitchen environment with heavy grease-laden air?

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

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

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)
Clean only at end of day
Spray with sanitizer without disassembly

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

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

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 37: What does the CFESA certification exam primarily assess?

Technical competency in servicing commercial food equipment across multiple disciplines (Correct answer)
Sales and customer service skills
Equipment manufacturing knowledge
Business management skills only

Correct answer: Technical competency in servicing commercial food equipment across multiple disciplines

The CFESA certification exam evaluates a technician's technical knowledge across refrigeration, gas, electrical, and mechanical systems used in commercial food service equipment.

Question 38: What is the primary purpose of a grease trap on commercial cooking equipment drain connections?

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

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 39: When a technician replaces a food-contact gasket on a commercial refrigerator door, which NSF-related requirement must the replacement part meet?

The replacement gasket must be NSF/ANSI 51 listed (food equipment materials), non-toxic, non-absorbent, and smooth-surfaced to prevent bacterial harborage (Correct answer)
The replacement gasket must be the same color as the original to indicate identical material composition
Any food-grade silicone gasket may be substituted regardless of the original specification
The gasket must be replaced by an NSF-certified technician or the unit loses its listing

Correct answer: The replacement gasket must be NSF/ANSI 51 listed (food equipment materials), non-toxic, non-absorbent, and smooth-surfaced to prevent bacterial harborage

NSF/ANSI 51 governs materials used in food zone components. Gaskets must be non-toxic, non-porous, and have a surface that can be effectively cleaned and sanitized. Using a non-listed gasket material violates the equipment's NSF listing and may introduce chemical contamination or harbor biofilm.

Question 40: NSF/ANSI 4 covers which category of commercial food equipment?

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

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 41: What causes cavitation in a commercial dishwasher pump?

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

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

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

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

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

Motor efficiency under load
Capacitor condition
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 45: How often should commercial dishwasher spray arm nozzles be inspected and cleaned?

Only when problems are reported
Annually
Monthly
Daily or per manufacturer PM schedule (Correct answer)

Correct answer: Daily or per manufacturer PM schedule

Commercial dishwasher spray arms should be inspected and cleaned daily or per the manufacturer's PM schedule to ensure effective warewashing.

Question 46: When diagnosing an intermittent fault on commercial food equipment, the most effective approach is:

Recreate the fault condition, monitor all relevant parameters, and use wiring diagrams to isolate the circuit (Correct answer)
Wait for the fault to occur and observe the symptom only
Replace the control board as it is the most likely cause of intermittent faults
Replace all major components until the fault goes away

Correct answer: Recreate the fault condition, monitor all relevant parameters, and use wiring diagrams to isolate the circuit

Intermittent faults require systematic diagnosis: recreating conditions that trigger the fault, measuring electrical parameters, and using schematics to isolate the faulty circuit.

Question 47: What causes a compressor to short cycle in a commercial refrigeration unit?

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

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 48: What does the DOE's commercial refrigeration equipment efficiency standard require manufacturers to comply with?

Maximum refrigerant charge limits
Required use of natural refrigerants only
Minimum energy efficiency levels expressed as daily energy consumption limits (Correct answer)
Maximum operating noise levels

Correct answer: Minimum energy efficiency levels expressed as daily energy consumption limits

DOE standards require commercial refrigeration equipment (display cases, reach-ins, walk-ins) to meet minimum energy efficiency levels measured as maximum daily kWh consumption.

Question 49: 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
Wash tank temperature at the heating element
Booster heater inlet temperature

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 50: After replacing a thermostat on a commercial fryer, the oil continues to overheat past the setpoint. What is the most likely oversight?

The high-limit switch needs calibration
The new thermostat bulb is not fully seated in its well (Correct answer)
The fryer needs a full oil change
The gas valve orifice is the wrong size

Correct answer: The new thermostat bulb is not fully seated in its well

If the thermostat sensing bulb is not fully inserted into the capillary well, it senses a lower temperature than actual oil temperature, causing uncontrolled overheating.

Question 51: When replacing a hermetic compressor in a commercial reach-in refrigerator, what procedure is MOST critical before brazing the new compressor in place?

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

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 52: 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
Dirty condenser coils
Failed defrost heaters, defrost timer/control, or defrost termination thermostat (Correct answer)

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 53: A commercial deep fryer's oil is overheating well above the setpoint. After confirming the thermostat is calibrated, the technician should test:

The fryer basket for warping
The oil filtration pump
The flue baffle position
The gas valve for proper closure when the thermostat is satisfied (Correct answer)

Correct answer: The gas valve for proper closure when the thermostat is satisfied

If the thermostat is calibrated and the oil still overheats, the gas valve may be sticking open rather than closing when the thermostat is satisfied, causing continuous heating.

Question 54: What is the key functional difference between a Type I and a Type II commercial kitchen exhaust hood?

Type I requires makeup air; Type II does not
Type I is designed to capture grease-laden vapors and requires a grease filter and fire suppression system; Type II handles only heat and moisture without grease (Correct answer)
Type I is used only over solid-fuel equipment; Type II over gas equipment
Type I operates at higher static pressure than Type II

Correct answer: Type I is designed to capture grease-laden vapors and requires a grease filter and fire suppression system; Type II handles only heat and moisture without grease

Type I hoods are rated to capture grease-laden effluent and must incorporate listed grease filters and a fire suppression system. Type II hoods handle heat, steam, and odors from non-grease-producing equipment (dishwashers, ovens with no direct flame exposure) and do not require grease filters or suppression.

Question 55: 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)
Subcool the liquid refrigerant before the metering device
Increase refrigerant flow velocity to the evaporator
Separate oil from the refrigerant before the condenser

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 56: When repairing a commercial tilting skillet with a hydraulic tilt mechanism that moves too slowly, what is the appropriate corrective action?

Replace the entire hydraulic cylinder
Increase electrical supply voltage
Lubricate the tilting pivot pins only
Check hydraulic fluid level, condition, and adjust flow control valve if equipped (Correct answer)

Correct answer: Check hydraulic fluid level, condition, and adjust flow control valve if equipped

Low or degraded hydraulic fluid reduces system pressure and flow, causing slow movement; the flow control valve setting also affects tilt speed.

Question 57: A combi oven's humidity sensor is suspected to be faulty. Which symptom would most directly point to a failed humidity sensor?

Door latch does not engage properly
Steam injection does not match the programmed humidity level during cooking (Correct answer)
Oven fails to reach temperature setpoint
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 58: A commercial refrigeration unit's compressor runs continuously but the box temperature never reaches setpoint. Suction pressure is lower than normal and discharge pressure is also low. What does this most likely indicate?

Refrigerant undercharge (low charge) (Correct answer)
Refrigerant overcharge (high charge)
Evaporator fan motor failure
Condenser coil fouled with grease

Correct answer: Refrigerant undercharge (low charge)

Both low suction and low discharge pressure together are classic indicators of an insufficient refrigerant charge in the system.

Question 59: When servicing a commercial broiler, technicians should check the infrared burner for:

Carbon monoxide output only
Cracks, plugged ports, and uneven heat distribution (Correct answer)
Pilot orifice size only
Manifold pressure only

Correct answer: Cracks, plugged ports, and uneven heat distribution

Infrared burners must be inspected for cracks in the ceramic tile, clogged ports, and uneven glowing patterns that indicate improper combustion.

Question 60: A commercial convection oven fan runs backward (opposite direction). The most likely cause is:

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

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 61: Which practice MOST effectively reduces customer churn in a commercial food equipment service business?

Proactive communication, follow-up calls after service, and consistent quality (Correct answer)
Charging the lowest possible rates regardless of service quality
Eliminating service contracts to focus on per-call billing
Only accepting new customers when referred by existing ones

Correct answer: Proactive communication, follow-up calls after service, and consistent quality

Proactive communication and quality follow-through build trust and loyalty, which are the primary drivers of customer retention.

Question 62: What is the typical evaporator temperature range for a commercial ice cream freezer (hardening cabinet)?

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

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

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

Correct answer: Dirty condenser coils

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

Question 64: A technician specializing in commercial refrigeration wants to demonstrate advanced competency. Which certification pathway is most aligned with this goal?

ServSafe Food Handler certification
RETA (Refrigerating Engineers and Technicians Association) CARO or CRES certification (Correct answer)
CompTIA Network+ certification
NATE Core Exam for residential HVAC

Correct answer: RETA (Refrigerating Engineers and Technicians Association) CARO or CRES certification

RETA's CARO and CRES certifications are specifically designed to validate advanced competency in commercial and industrial refrigeration.

Question 65: What does the UL listing mark on commercial food equipment indicate?

The equipment is approved for use in USDA-inspected facilities
The equipment meets minimum energy efficiency standards set by the DOE
The equipment has been tested and certified to meet specific safety standards by Underwriters Laboratories (Correct answer)
The equipment complies with NSF sanitation standards

Correct answer: The equipment has been tested and certified to meet specific safety standards by Underwriters Laboratories

The UL listing mark indicates that Underwriters Laboratories has tested the product and determined it meets established safety requirements.

Question 66: A commercial ice machine produces cloudy or opaque ice cubes. What maintenance action should be performed first?

Adjust the harvest timer
Increase refrigerant charge
Clean and sanitize the water system and replace the water filter (Correct answer)
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 67: Which organization administers the EPA Section 608 technician certification exam that commercial refrigeration technicians must pass before purchasing regulated refrigerants?

State environmental agencies in each jurisdiction
CFESA-approved testing centers only
The EPA directly administers all exams
EPA-approved testing organizations such as ESCO Institute or trade associations (Correct answer)

Correct answer: EPA-approved testing organizations such as ESCO Institute or trade associations

The EPA approves third-party testing organizations—such as ESCO Institute, HVACR trade associations, and others—to administer the Section 608 certification exams.

Question 68: 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?

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

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

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

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 70: 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 71: What does superheat indicate in a refrigeration system?

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

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 72: 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?

ASHRAE
NSF International
Local health department (Correct answer)
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 73: A commercial dishwasher's wash arms are not rotating. The pump motor runs normally. What is the most likely cause?

Failed heating element
Low water temperature
Faulty door interlock switch
Clogged or blocked wash arm ports (Correct answer)

Correct answer: Clogged or blocked wash arm ports

Clogged wash arm ports restrict water flow and prevent the hydraulic pressure needed to spin the wash arms.

Question 74: What is the function of a high-limit thermostat (safety thermostat) in a commercial deep fryer?

To trigger the automatic oil filtration cycle at the end of cooking
To cut off the burner or heating elements if oil temperature exceeds a safe maximum, preventing autoignition and fire (Correct answer)
To regulate oil temperature at the operator's set point during normal operation
To signal the control board to initiate a cold-zone purge cycle

Correct answer: To cut off the burner or heating elements if oil temperature exceeds a safe maximum, preventing autoignition and fire

The high-limit thermostat is a safety device — it is completely separate from the operating thermostat and activates only if oil temperature rises dangerously above the set point (typically 410–430°F on most fryers). It interrupts the burner/element circuit to prevent oil autoignition. It is not involved in normal temperature regulation.

Question 75: A technician finds frost forming uniformly across the entire evaporator coil in a walk-in cooler. What is the most likely cause?

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

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 76: When a service company owner reviews candidates for a field supervisor role, which combination is most likely to result in selection?

Highest number of completed training videos on the company LMS
Most years with the company regardless of performance
CFESA certification, clean driving record, strong communication skills, and demonstrated leadership (Correct answer)
Lowest hourly wage expectation and availability on weekends

Correct answer: CFESA certification, clean driving record, strong communication skills, and demonstrated leadership

Field supervisor candidates are evaluated on their certified technical knowledge, reliability, communication ability, and evidence of leadership potential.

Question 77: A commercial refrigerator compressor hums but does not start. The technician confirms proper voltage at the compressor terminals. What should be tested first?

Start relay and start capacitor (Correct answer)
Condenser coil cleanliness
Refrigerant charge level
Evaporator fan motor

Correct answer: Start relay and start capacitor

A humming compressor that fails to start typically indicates a faulty start relay or start capacitor that is not providing the necessary torque to initiate rotation.

Question 78: What is the purpose of a 'dispatch matrix' in a service operation?

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

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

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

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 80: What unit is most commonly used to measure water hardness in commercial food equipment service?

GPG (grains per gallon) (Correct answer)
PPM of chlorine
PSI (pounds per square inch)
BTU per hour

Correct answer: GPG (grains per gallon)

Water hardness is measured in grains per gallon (GPG), where 1 GPG equals approximately 17.1 mg/L of calcium carbonate.

Question 81: 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 door gaskets and thermostat calibration (Correct answer)
The compressor motor winding resistance
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 82: A combi oven displays an error code indicating a steam generation fault. The technician confirms water supply is present. What should be inspected next?

Grease drain trap
Combustion air fan
Door latch mechanism
Steam generator scale buildup or heating element failure (Correct answer)

Correct answer: Steam generator scale buildup or heating element failure

Scale buildup on the steam generator heating element or a burned-out element are the most common causes of steam generation faults when water supply is adequate.

Question 83: In a parallel rack refrigeration system used in supermarkets, which component controls refrigerant distribution to multiple display cases?

A single TXV for all cases
Liquid line solenoid on the rack
Electronic expansion valves and case controllers (Correct answer)
Suction pressure regulator

Correct answer: Electronic expansion valves and case controllers

Electronic expansion valves paired with individual case controllers precisely meter refrigerant flow to each display case in a parallel rack system.

Question 84: According to FDA Food Code, what is the minimum hot holding temperature for cooked foods maintained in commercial food equipment?

135°F (57°C) (Correct answer)
150°F (66°C)
145°F (63°C)
140°F (60°C)

Correct answer: 135°F (57°C)

The FDA Food Code requires cooked foods to be held at a minimum internal temperature of 135°F (57°C) to prevent bacterial growth in commercial hot holding equipment.

Question 85: The purpose of a crankcase pressure regulator (CPR) valve in a refrigeration system is to:

Limit suction pressure entering the compressor during pulldown (Correct answer)
Regulate oil pressure in the crankcase
Prevent high discharge pressure
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 86: A walk-in freezer compressor short-cycles (runs briefly and shuts off repeatedly). The low-pressure cutout is tripping. What is the MOST likely cause?

Overcharge of refrigerant
Faulty high-pressure switch
Condenser coil is dirty
Low refrigerant charge (Correct answer)

Correct answer: Low refrigerant charge

A low refrigerant charge causes suction pressure to drop below the low-pressure cutout setpoint, causing the compressor to short-cycle on low pressure.

Question 87: When calibrating a commercial convection oven thermostat, a technician finds it reads 25°F high. The correct action is:

Adjust the calibration screw per manufacturer specification to correct the offset (Correct answer)
Advise the operator to set the temperature 25°F lower
Replace the temperature probe
Replace the thermostat immediately

Correct answer: Adjust the calibration screw per manufacturer specification to correct the offset

Most commercial oven thermostats have an adjustment screw that allows the technician to calibrate the setpoint to match actual oven temperature.

Question 88: When performing a preventive maintenance inspection on a commercial steamer, which component should be de-limed most frequently in areas with hard water?

Steam generator or boiler tank (Correct answer)
Drain valve solenoid
Control board
Door gasket

Correct answer: Steam generator or boiler tank

Hard water causes calcium and mineral deposits to accumulate rapidly in steam generators, reducing efficiency and potentially damaging heating elements.

Question 89: When should a technician consult a manufacturer's Service Bulletin (TSB) in addition to the standard service manual?

Only after the repair has failed twice using the standard diagnostic procedure
Only when the equipment is under active warranty
Service bulletins are for sales staff only and do not apply to field technicians
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 90: Under OSHA's Lockout/Tagout standard (29 CFR 1910.147), before servicing commercial food equipment a technician must:

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

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 91: 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?

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

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 92: 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 93: Which tool is used to measure gas manifold pressure in commercial cooking equipment?

Clamp meter
Multimeter
Manometer or magnehelic gauge (Correct answer)
Anemometer

Correct answer: Manometer or magnehelic gauge

A manometer or magnehelic gauge measures gas pressure in inches of water column (W.C.), the standard unit for manifold pressure measurement.

Question 94: 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?

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

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 95: When inspecting a commercial steam table's water pan, you notice a white crusty buildup. The correct corrective action is to:

Increase the water temperature to dissolve the deposits during operation
Delime the pan using an approved food-safe acid solution and rinse thoroughly (Correct answer)
Replace the entire water pan immediately
Apply a coat of food-safe oil to prevent future buildup

Correct answer: Delime the pan using an approved food-safe acid solution and rinse thoroughly

White crusty deposits are mineral scale (lime) that can be safely removed with a food-safe acidic deliming solution, followed by thorough rinsing before returning to service.

Question 96: Under ASHRAE Standard 15, what is the maximum allowable refrigerant concentration limit (RCL) used to determine if a machinery room is required?

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

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 97: When a technician vents more than the de minimis amount of refrigerant during service, what penalty can the EPA impose per violation?

Up to $44,539 per day (Correct answer)
Up to $25,000 per day
Up to $5,000 per day
Up to $1,000 per day

Correct answer: Up to $44,539 per day

EPA civil penalties for CAA Section 608 violations are inflation-adjusted and can reach over $44,000 per day per violation as of recent adjustments.

Question 98: In a commercial refrigeration system using an electronic expansion valve (EEV), which parameter does the controller primarily modulate to maintain proper superheat?

Condenser fan speed
Valve opening percentage (Correct answer)
Evaporator fan speed
Compressor 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 99: Per OSHA 29 CFR 1910.147 (Lockout/Tagout), when must a service technician apply a personal lockout device to commercial food equipment?

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
Only when the equipment owner requests it in writing

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 100: A gas fryer burner lights but extinguishes within 30 seconds. The technician confirms adequate gas pressure. What is the most probable fault?

Cracked heat exchanger
Incorrect orifice size
Blocked flue vent
Faulty thermocouple or flame sensor (Correct answer)

Correct answer: Faulty thermocouple or flame sensor

A weak or failed thermocouple/flame sensor cannot generate sufficient millivoltage to hold the gas valve open, causing burner dropout.

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

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