CFESA Certified Food Equipment Service Technician Exam — Questions and Answers

Question 1: A technician notices oil pooling in the evaporator of a low-temperature display case. The most appropriate corrective action is:

Add more refrigerant
Replace the expansion valve
Verify oil return lines and compressor crankcase heater operation (Correct answer)
Check and increase the refrigerant charge

Correct answer: Verify oil return lines and compressor crankcase heater operation

Oil pooling in the evaporator indicates poor oil return; checking oil return lines and crankcase heater ensures oil circulates back to the compressor.

Question 2: What is the purpose of a contactor in commercial food equipment?

To protect against ground faults
To switch high-current loads on and off via a low-current control circuit (Correct answer)
To convert AC power to DC power
To regulate voltage levels

Correct answer: To switch high-current loads on and off via a low-current control circuit

A contactor uses a small control circuit to open and close contacts that switch heavy loads like compressors and heating elements.

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

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

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 4: During routine maintenance on a gas-fired commercial range, what is the correct procedure for checking burner orifice condition?

Ream the orifice with a drill bit to clear obstructions
Replace all orifices annually regardless of condition
Inspect visually and clean with compressed air; replace if deformed (Correct answer)
Use a wire brush to clear carbon buildup from the orifice

Correct answer: Inspect visually and clean with compressed air; replace if deformed

Orifice openings must never be reamed or wire-brushed because any enlargement alters the gas-to-air ratio; cleaning with compressed air and visual inspection is the correct approach.

Question 5: What condition is indicated when a compressor's suction line frosts heavily all the way back to the compressor?

Normal operating condition
Low refrigerant charge
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 6: During a refrigerant leak search on commercial equipment, which method is most effective for pinpointing small leaks in tight spaces?

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

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 7: 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
Replace the water inlet valve
Increase refrigerant charge

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 8: 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 9: Which CFESA certification is considered the highest level of professional achievement for a commercial food equipment technician?

Master Certified Food Equipment Technician (MCFET)
CFESA Certified Master Technician (CCMT) (Correct answer)
Certified Food Equipment Service Technician (CFEST)
Senior Food Equipment Specialist (SFES)

Correct answer: CFESA Certified Master Technician (CCMT)

The CFESA Certified Master Technician (CCMT) designation represents the highest level of professional recognition offered by CFESA.

Question 10: A combi oven displays an error code indicating a steam generation fault. The technician confirms water supply is present. What should be inspected next?

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

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 11: What device automatically shuts off the gas supply if the pilot flame is extinguished on commercial gas equipment?

Manual reset valve
Gas solenoid valve
Gas pressure regulator
Thermocouple or thermopile safety system (Correct answer)

Correct answer: Thermocouple or thermopile safety system

A thermocouple or thermopile generates a small electrical current when heated by the pilot flame, which holds open the safety gas valve.

Question 12: According to FDA Food Code, what is the minimum hot holding temperature for cooked foods maintained in commercial food equipment?

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

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 13: What NSF standard governs the design, construction, and material requirements for commercial food equipment?

NSF/ANSI 3
NSF/ANSI 2 (Correct answer)
NSF/ANSI 169
NSF/ANSI 51

Correct answer: NSF/ANSI 2

NSF/ANSI 2 covers the minimum food zone design and fabrication requirements for commercial food equipment to ensure cleanability and sanitation.

Question 14: A technician finds frost forming uniformly across the entire evaporator coil in a walk-in cooler. What is the most likely cause?

Restricted airflow across the coil (Correct answer)
Defective defrost heater
Overcharge of refrigerant
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 15: How often must EPA-certified refrigerant recovery technicians renew their Section 608 certification?

Every 5 years
Every year
Every 2 years
Section 608 certification does not expire (Correct answer)

Correct answer: Section 608 certification does not expire

EPA Section 608 technician certification does not have an expiration date; once certified, the technician remains certified unless new rules require updated testing.

Question 16: Which continuing education activity is most directly recognized by CFESA for maintaining certification standing?

Shadowing a master technician for one week
Attending manufacturer product demonstration webinars
Completing CFESA-approved training courses and accumulating CEUs (Correct answer)
Reading trade magazines

Correct answer: Completing CFESA-approved training courses and accumulating CEUs

CFESA requires certified technicians to accumulate Continuing Education Units (CEUs) through CFESA-approved courses to maintain their certification.

Question 17: 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 evaporator coil for ice blockage and defrost system operation (Correct answer)
The compressor oil level
The condenser fan motor
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 18: A commercial ice machine produces small, misshapen ice cubes. The most likely cause is:

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

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

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

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.

Question 20: What is the primary benefit of implementing a digital dispatching and scheduling system in CFESA business operations?

Reducing the need for customer follow-up
Improving technician response times and route optimization (Correct answer)
Eliminating the need for service reports
Increasing the number of manual processes

Correct answer: Improving technician response times and route optimization

Implementing a digital dispatching and scheduling system primarily benefits CFESA businesses by automating the assignment and routing of service calls. This automation leads to more efficient route planning and faster response times for technicians, significantly improving service delivery. Ultimately, this enhances customer satisfaction and operational efficiency by optimizing resource allocation.

Question 21: During startup, a steam kettle pressure gauge reads normal but the kettle is not heating. Which diagnostic step should be performed first?

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

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 22: A commercial fryer's heating element reads infinite resistance with an ohmmeter. What does this indicate?

The element is operating normally
The element has an open circuit and must be replaced (Correct answer)
The element has low resistance due to overheating
The element has shorted to ground

Correct answer: The element has an open circuit and must be replaced

Infinite resistance on an ohmmeter indicates an open (broken) circuit within the heating element, meaning current cannot flow.

Question 23: A commercial fryer's high-limit thermostat has tripped and the unit will not heat. After resetting it, what should the technician verify?

Replace the high-limit thermostat immediately
Clean the burner tubes and return to service
Verify oil level, thermostat calibration, and root cause of overheating before returning to service (Correct answer)
Replace the gas valve

Correct answer: Verify oil level, thermostat calibration, and root cause of overheating before returning to service

Before returning the fryer to service, the technician must identify why the high limit tripped (low oil, failed thermostat, stuck gas valve) to prevent recurrence or fire.

Question 24: On a commercial walk-in cooler, door gaskets should be replaced when:

The door hinges are replaced
They show cracks, tears, or fail to create a proper seal (Correct answer)
Every 6 months regardless of condition
Only when the cooler fails to maintain temperature

Correct answer: They show cracks, tears, or fail to create a proper seal

Door gaskets must be replaced when they are cracked, torn, or no longer create an airtight seal, as this causes excessive energy consumption and temperature fluctuation.

Question 25: What causes cavitation in a commercial dishwasher pump?

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

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

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

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 27: 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 28: What is the function of a pressure differential switch on a commercial ice machine?

To control the water pump speed
To regulate water flow to the ice-making grid
To cycle the harvest valve on and off
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 29: A technician discovers that a restaurant's walk-in cooler refrigerant circuit uses R-22. Under current EPA regulations, which statement is TRUE?

Virgin R-22 production is banned, but recovered and reclaimed R-22 may still be used for servicing existing equipment (Correct answer)
The technician must immediately retrofit the system to an approved substitute refrigerant
R-22 equipment must be decommissioned within 30 days of inspection
R-22 may no longer be purchased or used under any circumstances

Correct answer: Virgin R-22 production is banned, but recovered and reclaimed R-22 may still be used for servicing existing equipment

Since January 1, 2020, virgin R-22 production and import have been banned in the US, but reclaimed or recovered R-22 can still legally be used to service existing equipment.

Question 30: What does the term 'temperature danger zone' mean in a food service context, and why is it directly relevant to a food equipment service technician?

32°F–212°F (0°C–100°C): the full range of water phase change that affects food texture during cooking
Above 165°F only: cooking equipment must exceed this temperature to destroy pathogens
41°F–135°F (5°C–57°C): the range in which most pathogenic bacteria multiply rapidly; technicians must ensure all holding, cooking, and refrigeration equipment keeps food outside this range (Correct answer)
Below 41°F only: refrigeration equipment must keep all food below this threshold to prevent freezing damage

Correct answer: 41°F–135°F (5°C–57°C): the range in which most pathogenic bacteria multiply rapidly; technicians must ensure all holding, cooking, and refrigeration equipment keeps food outside this range

The danger zone (41°F–135°F per FDA Food Code) is the temperature range where pathogenic bacteria like Salmonella, E. coli, and Listeria double rapidly. Every category of food service equipment — refrigerators, hot-holders, steam tables, cooking equipment — is engineered to keep food either below or above this range. A technician who returns a unit to service without verifying proper temperature may inadvertently enable dangerous bacterial growth.

Question 31: What is the minimum final rinse temperature required at the dish surface for a high-temperature commercial dishwasher to achieve proper sanitization?

180°F (82°C) (Correct answer)
160°F (71°C)
212°F (100°C)
140°F (60°C)

Correct answer: 180°F (82°C)

NSF/ANSI 3 and FDA Food Code require a minimum 180°F (82°C) at the dish surface during the final rinse cycle to achieve sanitization in high-temperature machines. The booster heater raises incoming water to meet this threshold.

Question 32: What does R-454B refrigerant represent in terms of regulatory compliance?

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

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 33: Subcooling in a refrigeration system refers to:

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

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

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

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 35: When lubricating the door hinges and rollers of a commercial convection oven, which lubricant type is appropriate?

WD-40 spray lubricant
Standard petroleum-based grease
Food-grade high-temperature grease (NSF H1) (Correct answer)
Silicone spray only

Correct answer: Food-grade high-temperature grease (NSF H1)

NSF H1 food-grade lubricants are required for components where incidental food contact is possible, and must be rated for the high temperatures encountered near oven doors.

Question 36: 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)
Increase refrigerant flow velocity to the evaporator
Separate oil from the refrigerant before the condenser
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 37: A commercial ice machine produces small, cloudy ice cubes. What is the MOST likely cause?

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

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

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

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

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

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

Only when noise is detected
Every 30 days
Annually regardless of use
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 41: What is the required maximum clearance between a listed grease filter and an open flame on cooking equipment below a Type I hood, per NFPA 96?

6 inches (152 mm)
36 inches (914 mm)
18 inches (457 mm) (Correct answer)
24 inches (610 mm)

Correct answer: 18 inches (457 mm)

NFPA 96 Section 4.2.1 specifies that grease filters must be installed at least 18 inches (457 mm) above cooking surfaces with open flames. This clearance is required to prevent grease filter ignition from direct flame contact.

Question 42: 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)
Compressor speed
Evaporator 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 43: How can mentorship programs within CFESA-certified companies support career advancement for technicians?

By reducing the workload for senior technicians
By encouraging technicians to work independently without support
By providing less experienced technicians with guidance and knowledge from seasoned professionals (Correct answer)
By limiting opportunities for professional development

Correct answer: By providing less experienced technicians with guidance and knowledge from seasoned professionals

Mentorship programs within CFESA-certified companies are vital for career advancement as they facilitate the transfer of practical knowledge and experience. Seasoned professionals provide guidance, share best practices, and offer insights to less experienced technicians. This direct support accelerates skill development, helps navigate challenges, and fosters a strong foundation for professional growth.

Question 44: 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 45: A commercial convection oven's blower motor runs but the fan blade does not spin. What is the most likely cause?

Open limit switch
Sheared motor shaft key or set screw (Correct answer)
Tripped thermal overload
Failed run capacitor

Correct answer: Sheared motor shaft key or set screw

If the motor runs but the blade does not spin, a sheared key or loose set screw has disconnected the blade from the shaft.

Question 46: 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 threshold at which refrigerant becomes flammable
The maximum charge allowed per ton of cooling capacity
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 47: 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 48: 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 49: A water softener used in commercial food equipment service exchanges calcium and magnesium ions for:

Sodium or potassium ions (Correct answer)
Hydrogen ions
Chloride ions
Bicarbonate ions

Correct answer: Sodium or potassium ions

Ion exchange water softeners replace hardness-causing calcium and magnesium ions with sodium (or potassium) ions, which do not form scale.

Question 50: What causes a compressor to short cycle in a commercial refrigeration unit?

Low refrigerant charge causing rapid pressure equalization (Correct answer)
Dirty evaporator coil
Oversize expansion valve
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 51: When calibrating a commercial convection oven thermostat, a technician finds it reads 25°F high. The correct action is:

Advise the operator to set the temperature 25°F lower
Replace the temperature probe
Adjust the calibration screw per manufacturer specification to correct the offset (Correct answer)
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 52: How should a commercial food slicer blade be cleaned and sanitized according to food safety standards?

Spray with sanitizer without disassembly
Wipe with a dry cloth after each use
Clean only at end of day
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 53: What does a high discharge pressure combined with a normal or low suction pressure indicate in a commercial refrigeration system?

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

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

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

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 55: What does the EPA's SNAP (Significant New Alternatives Policy) program regulate?

Energy efficiency of new commercial appliances
Gas appliance emission standards
New refrigerants and substitutes for ozone-depleting substances (Correct answer)
Technician certification requirements

Correct answer: New refrigerants and substitutes for ozone-depleting substances

The EPA SNAP program evaluates and regulates refrigerant alternatives to ozone-depleting substances, listing acceptable and unacceptable substitutes for specific end uses.

Question 56: What is the purpose of the deliming procedure on a commercial combi oven?

Remove mineral scale deposits from steam-generating components (Correct answer)
Remove grease buildup from burners
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 57: 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 58: A gas range fails to reignite after the kitchen's Ansul fire suppression system discharged. After confirming the gas valve is open, what is the most likely cause?

The suppression dry chemical contaminated the burner orifices
The range pilot was blown out by the CO2 from the suppression agent
The suppression system automatically shut off the gas via a fusible link or electrical interlock that has not been reset (Correct answer)
The range's igniter module failed due to heat exposure during the fire

Correct answer: The suppression system automatically shut off the gas via a fusible link or electrical interlock that has not been reset

NFPA 96 requires fire suppression systems to incorporate a gas shut-off — either a fusible-link mechanical valve or an electrical solenoid. After a discharge, these devices must be manually reset or the fusible link replaced before gas flow is restored. This is the most common post-discharge service call.

Question 59: In a parallel rack refrigeration system used in supermarkets, which component controls refrigerant distribution to multiple display cases?

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

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 60: What is the primary purpose of a phase-loss protection relay in three-phase commercial food equipment?

To balance voltage between phases automatically
To detect reverse phase rotation
To boost low voltage on one phase
To shut down the equipment if one of the three supply phases is lost (Correct answer)

Correct answer: To shut down the equipment if one of the three supply phases is lost

A phase-loss relay detects when one supply phase disappears and opens the control circuit, preventing motor damage from single-phasing.

Question 61: A commercial steam kettle is producing inconsistent temperatures. The first component to check is:

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

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 62: How can CFESA-certified technicians improve operational efficiency during service calls?

By conducting thorough diagnostics and having common parts on hand (Correct answer)
By carrying a limited selection of tools
By avoiding documentation of service activities
By minimizing communication with customers

Correct answer: By conducting thorough diagnostics and having common parts on hand

Efficient technicians minimize downtime by accurately diagnosing problems quickly and having the necessary parts readily available for immediate repair. Thorough diagnostics prevent unnecessary part replacements, while a well-stocked service vehicle reduces the need for multiple trips or ordering delays, allowing for single-visit resolutions and improved customer satisfaction.

Question 63: What is the minimum final rinse temperature required for a commercial high-temperature dishwasher to sanitize tableware?

140°F
160°F
180°F (Correct answer)
200°F

Correct answer: 180°F

High-temperature commercial dishwashers must achieve a minimum 180°F rinse temperature at the rack surface to sanitize tableware per food safety codes.

Question 64: 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 requires a neutral wire and this is normal
The oven is properly connected to a single-phase supply
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 65: How can participating in CFESA events and conferences contribute to a technician's career advancement?

By decreasing the chances of promotion
By focusing solely on entertainment
By providing learning opportunities and industry recognition (Correct answer)
By reducing exposure to industry trends

Correct answer: By providing learning opportunities and industry recognition

Participating in CFESA events and conferences significantly contributes to a technician's career by offering valuable learning opportunities and industry recognition. These events provide access to specialized workshops, new technology demonstrations, and expert presentations, enhancing skills and knowledge. Additionally, networking and potential recognition elevate a technician's professional standing and open doors for advancement.

Question 66: When a commercial gas range burner will not light via electronic ignition but the pilot-less igniter sparks normally, the technician should next check:

The igniter electrode gap and gas valve operation (Correct answer)
The flue damper position
The thermocouple resistance
The standing pilot orifice

Correct answer: The igniter electrode gap and gas valve operation

If the igniter sparks but the burner does not light, either the electrode is mispositioned relative to the burner or the gas valve is not opening to supply gas to the burner.

Question 67: A standing pilot on a commercial broiler repeatedly goes out during operation. After verifying gas pressure and pilot orifice are correct, what is the next most likely cause?

Manifold pressure is too high
The burner orifice requires cleaning
The gas valve operator coil has shorted
Thermocouple probe is positioned outside the pilot flame cone (Correct answer)

Correct answer: Thermocouple probe is positioned outside the pilot flame cone

If the thermocouple tip is not fully engulfed by the pilot flame, it cannot generate sufficient millivoltage to hold the safety valve open.

Question 68: What does a refrigeration system's COP (Coefficient of Performance) measure?

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

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

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

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

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

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 71: 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?

CFESA
Local health department (Correct answer)
NSF International
ASHRAE

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 72: A gas range burner produces a yellow, lifting flame instead of a blue cone flame. What is the most likely cause?

Cracked burner cap
High gas supply pressure
Insufficient primary air or partially blocked air shutter (Correct answer)
Excess primary air at the air shutter

Correct answer: Insufficient primary air or partially blocked air shutter

A yellow, lifting flame indicates incomplete combustion due to insufficient primary air mixing with the gas before ignition.

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

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

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

Verify the oil level in the new compressor crankcase
Recover all refrigerant and pull a deep vacuum (Correct answer)
Flush the system with refrigerant to remove air
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 75: Which component in a refrigeration system is responsible for removing heat from the refrigerant?

Compressor
Condenser (Correct answer)
Evaporator
Expansion valve

Correct answer: Condenser

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

Question 76: What does the DOE's commercial refrigeration equipment efficiency standard require manufacturers to comply with?

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

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 77: 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
Regulate final rinse pressure
Control water flow to the spray arms

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 78: 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 flue exhaust screen
Oil level, thermostat calibration, and burner/element heat distribution (Correct answer)
The oil filtration pump motor
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 79: 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
Failed bin thermostat
Low water distributor flow or clogged water nozzles (Correct answer)
Excessive ambient temperature

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 80: Which mechanical failure in a commercial mixer would cause oil to leak from the attachment hub area?

A misaligned bowl support bracket
A stripped planetary gear
A worn or damaged beater shaft oil seal (Correct answer)
A broken bowl lift spring

Correct answer: A worn or damaged beater shaft oil seal

The beater shaft oil seal prevents gear oil from migrating down the shaft and escaping at the attachment hub; a worn seal allows oil to leak at that point.

Question 81: What does superheat indicate in a refrigeration system?

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

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 82: A commercial convection oven's gas valve fails to open when the thermostat calls for heat. After confirming 24V at the valve, the technician should:

Inspect the burner orifice
Replace the gas valve (Correct answer)
Replace the thermostat
Check the ignition module output

Correct answer: Replace the gas valve

If 24V is confirmed at the gas valve and it still does not open, the valve coil has failed and the gas valve must be replaced.

Question 83: Which refrigerant property is measured by a superheat reading at the evaporator outlet?

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

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

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)
Filter food particles from drain water

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 85: What does a 100% lockout on a commercial gas burner control system mean?

The burner is locked at 100% input
The burner is operating at full capacity
The ignition system has failed to prove flame and shut off gas completely (Correct answer)
Gas pressure has exceeded safe levels

Correct answer: The ignition system has failed to prove flame and shut off gas completely

A 100% lockout means the ignition module attempted to light the burner, failed to detect a flame, and has shut off the gas valve requiring manual reset.

Question 86: In a commercial refrigeration system, what is the role of the oil separator?

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

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 87: 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 88: What does a commercial warewasher's booster heater do?

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)
Preheat the wash water

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 89: A commercial griddle's thermostat bulb has lost its charge. How does this typically affect the thermostat's behavior?

The thermostat reads exactly 100°F regardless of actual temperature
The thermostat oscillates between full on and full off rapidly
The thermostat locks in the open position, preventing heating
The thermostat locks in the closed position, causing continuous heating up to the high limit (Correct answer)

Correct answer: The thermostat locks in the closed position, causing continuous heating up to the high limit

A thermostat with a lost bulb charge has no sensing pressure to open the contacts, so it defaults to the closed (call for heat) position, causing uncontrolled heating.

Question 90: A service manager notices technicians are frequently spending more time on jobs than estimated. What is the FIRST step to address this problem?

Increase all labor quotes by 50%
Immediately reduce technician pay
Hire additional technicians
Analyze job records to identify patterns and root causes (Correct answer)

Correct answer: Analyze job records to identify patterns and root causes

Identifying patterns and root causes through data analysis allows management to implement targeted, effective solutions.

Question 91: What is the typical evaporator temperature range for a commercial ice cream freezer (hardening cabinet)?

-10°F to 0°F
-40°F to -20°F (Correct answer)
0°F to 15°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 92: A technician is called to service a commercial steamship round that will not heat. The first step in the diagnostic process should be:

Replace the heating element
Replace the temperature controller
Check the water level probe
Verify power supply voltage and check the thermostat for continuity (Correct answer)

Correct answer: Verify power supply voltage and check the thermostat for continuity

Diagnosing a no-heat condition starts with verifying proper voltage supply and then checking the control circuit (thermostat) for continuity before testing components.

Question 93: The purpose of a crankcase pressure regulator (CPR) valve in a refrigeration system is to:

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

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 94: 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)
Replace the control board as it is the most likely cause of intermittent faults
Wait for the fault to occur and observe the symptom only
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 95: 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 96: 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 97: What is the AHJ's role in commercial food equipment installation?

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

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

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

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

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

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

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

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.

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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