CFESA Certified Food Equipment Service Technician Exam — Questions and Answers

Question 1: A commercial deep fryer's oil is overheating well above the setpoint. After confirming the thermostat is calibrated, the technician should test:

The flue baffle position
The fryer basket for warping
The oil filtration pump
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 2: A gear-driven commercial slicer produces a loud grinding noise only when the carriage is moving. The motor runs quietly at idle. What is the MOST likely cause?

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

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

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

Question 3: What is the minimum final rinse temperature required for a commercial high-temperature dishwasher to sanitize tableware?

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

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

Excess glycol in the freezing cylinder
Mix temperature too cold
Refrigeration system underperforming or mix overrun too high (Correct answer)
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 5: 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)
Flush the system with refrigerant to remove air
Pressurize the system with nitrogen to 150 psig
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 6: Which test should a technician perform to verify a pressure relief valve is functioning correctly on a steam boiler?

Check the valve with a multimeter for continuity
Measure the inlet water flow rate with a flow meter
Manually lift the test lever briefly to confirm the valve opens and reseats (Correct answer)
Apply full supply voltage directly to the valve coil

Correct answer: Manually lift the test lever briefly to confirm the valve opens and reseats

Lifting the test lever momentarily verifies that the valve opens freely and reseats properly, confirming it is not seized and will operate when needed.

Question 7: 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
Thermostat bulb
Exterior stainless steel surface

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

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

Question 8: A commercial dishwasher's wash arms are not rotating. The pump motor runs normally. What is the most likely cause?

Faulty door interlock switch
Low water temperature
Failed heating element
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 9: A commercial dishwasher's final rinse temperature consistently reads 160°F instead of the required 180°F. After confirming the booster heater element is functional, what should be checked next?

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

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

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

Question 10: What diagnostic information does a pressure-temperature (P-T) chart provide to a refrigeration technician?

Refrigerant oil viscosity requirements
Head pressure limits for specific ambient temperatures
The saturation temperature of a refrigerant at a given pressure (Correct answer)
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 11: 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)
Replace the water inlet valve
Increase refrigerant charge
Adjust the harvest timer

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

Raise incoming water temperature to the required 180°F final rinse temperature (Correct answer)
Heat the detergent solution
Maintain water temperature in the tank between cycles
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 13: A water softener used in commercial food equipment service exchanges calcium and magnesium ions for:

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

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

NSF/ANSI 2 (Correct answer)
NSF/ANSI 3
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 15: How can participating in CFESA events and conferences contribute to a technician's career advancement?

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

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

Calibrate the cooking thermostat
Remove mineral scale deposits from steam-generating components (Correct answer)
Remove grease buildup from burners
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 17: In a commercial refrigeration system using an electronic expansion valve (EEV), which parameter does the controller primarily modulate to maintain proper superheat?

Valve opening percentage (Correct answer)
Condenser fan speed
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 18: A commercial ice machine produces hollow or incomplete cubes. Refrigerant charge and water supply are confirmed normal. What is the most likely cause?

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

Correct answer: Low water distributor flow or clogged water nozzles

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

Question 19: What is the primary purpose of a grease trap on commercial cooking equipment drain connections?

Prevent drain odors from entering the kitchen
Collect fats, oils, and grease to prevent sewer system blockage (Correct answer)
Reduce water pressure in drain lines
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 20: What does the DOE's commercial refrigeration equipment efficiency standard require manufacturers to comply with?

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

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

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

Correct answer: Listed leak detection solution or electronic detector

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

Question 22: Under OSHA's Lockout/Tagout standard (29 CFR 1910.147), before servicing commercial food equipment a technician must:

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

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

145°F (63°C)
150°F (66°C)
135°F (57°C) (Correct answer)
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 24: 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:

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

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

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

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

Blocked flue vent
Cracked heat exchanger
Incorrect orifice size
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.

Question 27: What is the correct method to test a commercial heating element for an open circuit?

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

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

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

Question 28: A combi oven's steam generator is producing less steam than normal, but the heating element tests good and water is entering the generator. What is the most likely cause?

The convection fan motor has failed
Heavy scale buildup on the heating element is reducing heat transfer efficiency (Correct answer)
The cooking cavity temperature probe is out of calibration
The door gasket is allowing steam to escape

Correct answer: Heavy scale buildup on the heating element is reducing heat transfer efficiency

Scale acts as an insulator on heating elements; thick scale significantly reduces heat transfer to the water, slowing steam production even though the element itself is functional.

Question 29: A technician finds a commercial refrigerator compressor running continuously with the box temperature above setpoint. Suction pressure is low and superheat is high. What does this indicate?

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

Correct answer: Undercharge of refrigerant or refrigerant leak

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

Question 30: What is the minimum final rinse temperature required at the dish surface for a high-temperature commercial dishwasher to achieve proper sanitization?

140°F (60°C)
212°F (100°C)
180°F (82°C) (Correct answer)
160°F (71°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 31: Subcooling in a refrigeration system refers to:

Cooling the suction line below ambient
Reducing compressor discharge temperature
Cooling liquid refrigerant below its condensing temperature (Correct answer)
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 32: A technician notices oil pooling in the evaporator of a low-temperature display case. The most appropriate corrective action is:

Replace the expansion valve
Verify oil return lines and compressor crankcase heater operation (Correct answer)
Add more refrigerant
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 33: What is the purpose of a receiver in a commercial refrigeration system?

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

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

Standard petroleum-based grease
Food-grade high-temperature grease (NSF H1) (Correct answer)
WD-40 spray lubricant
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 35: In a parallel rack refrigeration system used in supermarkets, which component controls refrigerant distribution to multiple display cases?

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

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 36: 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)
Low refrigerant charge
Stuck open TXV

Correct answer: Dirty condenser coils

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

Question 37: How often must EPA-certified refrigerant recovery technicians renew their Section 608 certification?

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

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

When servicing equipment with more than one energy source
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

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

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

Correct answer: Ratio of cooling effect to energy input

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

Question 40: Which refrigerant property is measured by a superheat reading at the evaporator outlet?

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
The subcooling of refrigerant leaving the condenser

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

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

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

OSHA
FDA
DOE
EPA (Correct answer)

Correct answer: EPA

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

Question 43: 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)
Wash tank temperature at the heating element
Booster heater inlet temperature
Incoming water temperature only

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 44: 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 45: Which component in a refrigeration system is responsible for removing heat from the refrigerant?

Condenser (Correct answer)
Evaporator
Expansion valve
Compressor

Correct answer: Condenser

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

Question 46: What causes cavitation in a commercial dishwasher pump?

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

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

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

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

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

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 49: 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 50: What does a high discharge pressure combined with a normal or low suction pressure indicate in a commercial refrigeration system?

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

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 51: 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?

Below 41°F only: refrigeration equipment must keep all food below this threshold to prevent freezing damage
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)
32°F–212°F (0°C–100°C): the full range of water phase change that affects food texture during cooking

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 52: 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)
Regulate oil pressure in the crankcase
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 53: A commercial steam kettle is producing inconsistent temperatures. The first component to check is:

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

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 54: 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 1910.119 (PSM)
29 CFR 1910.303 (Electrical General Requirements)
29 CFR 1910.147 (Lockout/Tagout)

Correct answer: Both 29 CFR 1910.147 and 1910.303

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

Question 55: A commercial convection oven fan runs backward (opposite direction). The most likely cause is:

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

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

Overcharge of refrigerant
Defective defrost heater
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 57: 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 temperature controller
Check the water level probe
Verify power supply voltage and check the thermostat for continuity (Correct answer)
Replace the heating element

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

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

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 59: When checking for gas leaks on commercial equipment, technicians should use:

Electronic combustible gas detector or listed leak detection solution (Correct answer)
An open flame
Compressed air
Nitrogen pressure test only

Correct answer: Electronic combustible gas detector or listed leak detection solution

An electronic combustible gas detector or listed leak detection solution (never an open flame) is safe and effective for locating gas leaks.

Question 60: When a technician arrives at a job site and discovers the repair requires a part not on the service vehicle, what is the BEST course of action?

Inform the customer, document the situation, order the part, and schedule a follow-up (Correct answer)
Attempt to fabricate a replacement part from available materials
Leave immediately and return only when the part is available
Ask the customer to source the part independently

Correct answer: Inform the customer, document the situation, order the part, and schedule a follow-up

Professional service requires transparent communication with the customer, proper documentation, and timely follow-up scheduling.

Question 61: 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 62: What is the recommended maintenance interval for changing the oil in a commercial floor-type mixer?

Every 30 days
Only when noise is detected
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 63: Which NSF standard specifically governs the design and construction of commercial warewashing equipment?

NSF/ANSI 18
NSF/ANSI 3 (Correct answer)
NSF/ANSI 4
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 64: How can mentorship programs within CFESA-certified companies support career advancement for technicians?

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

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 65: A technician measures manifold pressure on a natural gas appliance and reads 4.5 inches W.C. The rated manifold pressure is 3.5 inches W.C. What should the technician do?

Adjust the supply regulator to lower pressure to 3.5 inches W.C. (Correct answer)
Replace the burner orifice with a smaller size
Notify the gas utility and take no further action
Adjust the primary air shutter to compensate

Correct answer: Adjust the supply regulator to lower pressure to 3.5 inches W.C.

Manifold pressure above the rated value must be corrected by adjusting the appliance or supply regulator to the manufacturer's specification.

Question 66: A technician notices that a deep fryer positioned near the edge of the exhaust hood capture area experiences frequent flame impingement and elevated flue temperatures. What is the FIRST corrective action to investigate?

Verify that the hood overhang dimension and exhaust CFM meet the equipment manufacturer's and NFPA 96 minimum capture velocity requirements for that appliance (Correct answer)
Clean the grease filters immediately, as blockage is redirecting heat
Replace the fryer's thermostat, as high flue temp indicates control failure
Increase the fryer's burner gas pressure to stabilize the flame

Correct answer: Verify that the hood overhang dimension and exhaust CFM meet the equipment manufacturer's and NFPA 96 minimum capture velocity requirements for that appliance

Flame instability and elevated temperatures near the hood edge indicate the hood is undersized or positioned incorrectly — insufficient overhang or inadequate CFM means the capture envelope does not fully contain the appliance's effluent plume. This is a code compliance and fire safety issue, not a fryer fault.

Question 67: What does superheat indicate in a refrigeration system?

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

Correct answer: Temperature rise of vapor above its saturation point

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

Question 68: What does the UL listing mark on commercial food equipment indicate?

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 meets minimum energy efficiency standards set by the DOE
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 69: During a refrigerant leak search on commercial equipment, which method is most effective for pinpointing small leaks in tight spaces?

Electronic leak detector
Bubble solution
UV dye with a UV lamp
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 70: A commercial ice machine produces small, cloudy ice cubes. What is the MOST likely cause?

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

Correct answer: High mineral content in the water supply

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

Question 71: What is the purpose of the UL listing on commercial food equipment?

Guarantees the equipment meets energy efficiency standards
Confirms NSF certification
Indicates the equipment meets food sanitation standards
Certifies the equipment has been tested for electrical safety by Underwriters Laboratories (Correct answer)

Correct answer: Certifies the equipment has been tested for electrical safety by Underwriters Laboratories

UL listing indicates that Underwriters Laboratories has tested and certified the equipment meets electrical safety standards for construction and operation.

Question 72: A technician needs to verify whether a heating element's insulation has broken down to the equipment chassis (ground fault). Which instrument is most appropriate?

Non-contact voltage tester
Megohmmeter (insulation resistance tester) (Correct answer)
Standard digital multimeter set to continuity
Clamp-on ammeter

Correct answer: Megohmmeter (insulation resistance tester)

A standard DMM measures resistance up to a few megohms with low test voltage (~9V), insufficient to stress the insulation as line voltage does. A megohmmeter applies 500–1000V DC and measures insulation resistance in the hundreds of megohms, revealing degraded insulation that would pass a DMM continuity check but fail in service. This is the correct tool for insulation integrity testing.

Question 73: Which type of expansion device maintains a constant evaporator pressure regardless of load?

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

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

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

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

Manifold pressure only
Cracks, plugged ports, and uneven heat distribution (Correct answer)
Pilot orifice size only
Carbon monoxide output 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 76: What is a key factor for technicians to advance their careers within a CFESA-certified organization?

Avoiding further education and training
Regularly updating their skills and obtaining certifications (Correct answer)
Limiting customer interactions
Refusing to take on challenging assignments

Correct answer: Regularly updating their skills and obtaining certifications

To advance their careers in the commercial food equipment service industry, technicians must continuously adapt to new technologies and equipment. Regularly updating their skills and obtaining relevant certifications demonstrates a commitment to professional growth and expertise. This proactive approach ensures they remain competent, versatile, and highly valuable to CFESA-certified organizations, opening doors for advancement.

Question 77: What does 'accounts receivable aging' refer to in service business management?

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

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 78: 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)
Steamer overheats and trips the high-limit thermostat
Steam pressure rises above the set point

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

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

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

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

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

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

Question 81: A walk-in cooler compressor short-cycles every 2-3 minutes. After ruling out refrigerant issues, what should the technician check next?

Condenser fan motor capacitor
High-pressure cutout switch (Correct answer)
Door sweep seal
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 82: A walk-in cooler evaporator coil is heavily frosted over even though the defrost cycle runs normally. What is the most likely cause?

Door gasket failure allowing warm moist air infiltration (Correct answer)
Low refrigerant charge
Oversized compressor
Faulty defrost timer

Correct answer: Door gasket failure allowing warm moist air infiltration

A damaged door gasket allows warm, humid ambient air into the cooler, which freezes on the evaporator coil faster than defrost cycles can remove it.

Question 83: What is 'makeup air' in the context of a commercial kitchen ventilation system, and why is it required?

Filtered outdoor air introduced to replace the volume exhausted by the hood, preventing negative pressure that would impair hood capture velocity and equipment combustion air (Correct answer)
The air recirculated inside the hood plenum to cool grease filters
Pressurized air injected into gas burner ports to improve combustion efficiency
Air supplied by the HVAC system to cool kitchen staff working near equipment

Correct answer: Filtered outdoor air introduced to replace the volume exhausted by the hood, preventing negative pressure that would impair hood capture velocity and equipment combustion air

For every cubic foot per minute exhausted by the hood, an equivalent volume must be supplied as makeup air. Without it, the kitchen develops negative pressure: exterior doors become hard to open, hood capture velocity drops, and atmospheric-combustion appliances can experience backdrafting and flame rollout.

Question 84: What condition is indicated when a compressor's suction line frosts heavily all the way back to the compressor?

Overcharge of refrigerant or a flooding TXV (Correct answer)
High ambient temperature
Normal operating condition
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 85: When recovering refrigerant from commercial equipment, technicians must comply with which EPA regulation?

Title V of the Clean Water Act
Section 608 of the Clean Air Act (Correct answer)
OSHA 29 CFR 1910.119
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 86: How should a commercial food slicer blade be cleaned and sanitized according to food safety standards?

Clean only at end of day
Disassemble, wash, rinse, and sanitize the blade and all food contact surfaces per NSF guidelines (Correct answer)
Wipe with a dry cloth after each use
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 87: 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
Evaporator fan motor
Refrigerant charge level

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

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 89: A technician discovers that a restaurant's walk-in cooler refrigerant circuit uses R-22. Under current EPA regulations, which statement is TRUE?

R-22 may no longer be purchased or used under any circumstances
R-22 equipment must be decommissioned within 30 days of inspection
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

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

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

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 91: On a commercial steamer using direct steam injection, which safety device prevents excessive steam pressure buildup?

Water level probe
Steam solenoid valve
Pressure relief valve (Correct answer)
Pressure regulator

Correct answer: Pressure relief valve

A pressure relief valve automatically vents steam when pressure exceeds the safe operating limit, preventing equipment damage or explosion.

Question 92: How often should commercial dishwasher spray arm nozzles be inspected and cleaned?

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

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

-40°F to -20°F (Correct answer)
20°F to 35°F
0°F to 15°F
-10°F to 0°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 94: What does R-454B refrigerant represent in terms of regulatory compliance?

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

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

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

Question 95: When replacing a faulty heating element in a commercial oven, what is a crucial step to ensure safety and proper function?

Ensuring the equipment is disconnected from the power source before installation (Correct answer)
Using any heating element regardless of specifications
Only replacing the heating element without checking other components
Installing the new heating element with the oven still running

Correct answer: Ensuring the equipment is disconnected from the power source before installation

Working with electrical components, especially heating elements, carries a significant risk of electric shock or short circuits if the equipment is still powered. Disconnecting the power source completely is a fundamental safety precaution that protects the technician from injury and prevents damage to the equipment. It ensures a safe working environment for the repair.

Question 96: A commercial convection oven's blower motor runs but the fan blade does not spin. What is the most likely cause?

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

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 97: What certification does CFESA offer to recognize service companies that meet standards for training, facilities, and business practices?

CFESA Premier Service Designation
CFESA 5-Star Certification (Correct answer)
CFESA Gold Standard Award
CFESA Master Certification

Correct answer: CFESA 5-Star Certification

CFESA's 5-Star Certification program recognizes service companies that demonstrate excellence in technician training, business practices, customer service, and professional standards.

Question 98: A refrigerated prep table shows ice buildup on the evaporator coil between scheduled defrosts. What condition does this most likely indicate?

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

Correct answer: Excessive moisture infiltration from a failing door seal

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

Question 99: A commercial fryer's heating element reads infinite resistance with an ohmmeter. What does this indicate?

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

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

R-410A
R-404A (Correct answer)
R-22
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.

CFESA Certified Food Equipment Service Technician Exam

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

100

Questions

120 min

Time Limit

70%

To Pass

Checking for saved progress...

Exam Rules

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

These practice questions were written with AI tools. They are not real exam questions. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

cfesa.com — Test delivery, eligibility, registration, renewal, score validity, exam information · verified Oct 2026