CFESA Food Equipment Maintenance 4 — Questions and Answers
Question 1: When performing a preventive maintenance inspection on a commercial steamer, which component should be de-limed most frequently in areas with hard water?
- Steam generator or boiler tank (Correct answer)
- Door gasket
- Control board
- Drain valve solenoid
Correct answer: Steam generator or boiler tank
Hard water causes calcium and mineral deposits to accumulate rapidly in steam generators, reducing efficiency and potentially damaging heating elements.
Question 2: A walk-in cooler evaporator coil is heavily frosted over even though the defrost cycle runs normally. What is the most likely cause?
- Faulty defrost timer
- Door gasket failure allowing warm moist air infiltration (Correct answer)
- Low refrigerant charge
- Oversized compressor
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 3: 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
- Inspect visually and clean with compressed air; replace if deformed (Correct answer)
- Replace all orifices annually regardless of condition
- 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 4: 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?
- Spray arm nozzle blockage
- Incoming water pressure and flow rate to the booster (Correct answer)
- Detergent dispenser timing
- 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 5: 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 6: A commercial ice machine produces cloudy or opaque ice cubes. What maintenance action should be performed first?
- Replace the water inlet valve
- Clean and sanitize the water system and replace the water filter (Correct answer)
- Adjust the harvest timer
- 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 7: 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 pilot light orifice
- Oil level, thermostat calibration, and burner/element heat distribution (Correct answer)
- The flue exhaust screen
- The oil filtration pump motor
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.
CFESA Food Equipment Maintenance 4
When performing a preventive maintenance inspection on a commercial steamer, which component should be de-limed most frequently in areas with hard water?