Electrical and Mechanical Systems Flashcards
7 cards from real CFESA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Electrical and Mechanical Systems flashcards as text
What is the purpose of a contactor in commercial food equipment?
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.
A commercial fryer's heating element reads infinite resistance with an ohmmeter. What does this indicate?
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.
Which type of mechanical seal failure would cause refrigerant oil to appear on the outside of a compressor?
Answer: Shaft seal leakage
A leaking shaft seal allows refrigerant oil to migrate along the crankshaft and appear on the compressor exterior.
When checking a three-phase motor for balance, what should the amperage readings between the three legs be?
Answer: Within 10% of each other
Amperage imbalance greater than 10% between legs indicates a problem with the power supply or the motor windings.
What is the function of a pressure differential switch on a commercial ice machine?
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.
Which wiring method uses color-coded conductors where green or bare copper always indicates?
Answer: The equipment grounding conductor
Per NEC standards, green insulation or bare copper conductor always identifies the equipment grounding conductor in a wiring system.
A solenoid valve on a commercial steamer fails to open when energized. The coil has correct voltage applied. What should be checked next?
Answer: The coil resistance and the mechanical plunger for binding or corrosion
If voltage is confirmed correct, a failed solenoid is either a burned coil or a mechanically stuck plunger, and both must be inspected.
How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. 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