20 Electrical Maintenance & Repair Practice Questions & Answers

Every Electrical Maintenance & Repair practice question from the CAMT Apartment Maintenance Practice Test, with the correct answer and a short explanation.

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1. A branch circuit is drawing more current than its conductors and breaker were designed to carry. Which condition is this, and how does the protective device respond?
- A.An arc fault; the breaker detects the signature of arcing current
- B.A short circuit; the breaker trips instantly on the fault current
- C.An overload; the breaker heats and trips as the demand persists✓ Answer
- D.A ground fault; the breaker detects current leaving the circuit
An overload is simply more load than the circuit was designed for. A thermal breaker works by a metal element that heats and bends, so it opens after the excessive draw continues for a time rather than the instant an appliance is plugged in. The correct field response is to move some plug-in loads to another circuit, never to fit a larger breaker.
Source: NAAEI CAMT Electrical Maintenance and Repair course, overloaded circuitsReport a problem with this question
2. Which description BEST defines a short circuit?
- A.Current takes an unintended low-resistance path back to its source✓ Answer
- B.Current jumps a gap between conductors and produces heat and light
- C.Current demand slowly climbs past the rating of the circuit wiring
- D.Current leaks from the circuit to earth through a person or damp path
Electricity always seeks the easiest path back to its source. In a short circuit that path is not the intended neutral and has almost no resistance, so the current surge is very large and immediate, which is why the breaker opens at once instead of after a delay.
Source: NAAEI CAMT Electrical Maintenance and Repair course, circuits and short circuitsReport a problem with this question
3. A resident reports a tingle when touching a plugged-in hair dryer while standing at a wet sink. Which condition is MOST likely present, and which device is designed to sense it?
- A.An overload, which a standard breaker is designed to sense
- B.A ground fault, which a GFCI device is designed to sense✓ Answer
- C.A short circuit, which a plug fuse is designed to sense
- D.An arc fault, which an AFCI device is designed to sense
A ground fault is current leaking out of the intended circuit path, in this case through the person to a damp grounded surface. A GFCI compares the current going out on the hot conductor with the current returning on the neutral and opens the circuit when a small imbalance appears, which is exactly this leakage.
Source: NAAEI CAMT Electrical Maintenance and Repair course, GFCI protectionReport a problem with this question
4. A kitchen circuit breaker has tripped three times in one week. The technician has already moved two plug-in appliances to another circuit and it tripped again. What should the technician do NEXT?
- A.Look for a fault in the wiring or a device and escalate the repair✓ Answer
- B.Replace the breaker with an identical one and treat the job as done
- C.Reset the breaker each time it trips and log it as resident misuse
- D.Install a breaker with a higher amperage rating to stop the tripping
A breaker that keeps tripping after the load has been reduced is reporting a fault, not misbehaving. The remaining causes are a short circuit, a ground fault or a loose or damaged connection, so the circuit must be investigated and handed to a licensed electrician if the technician cannot find and correct the cause. Fitting a larger breaker removes the protection while leaving the wiring the same size.
Source: NAAEI CAMT Electrical Maintenance and Repair course, troubleshooting tripped breakersReport a problem with this question
5. Which statement correctly matches each protective device to the hazard it senses?
- A.A GFCI senses current imbalance; an AFCI senses arcing faults✓ Answer
- B.A GFCI senses arcing faults; an AFCI senses current imbalance
- C.A GFCI senses voltage drop; an AFCI senses circuit overload
- D.A GFCI senses circuit overload; an AFCI senses a loose neutral
The two devices answer different hazards. A GFCI watches the balance between current leaving on the hot conductor and returning on the neutral and protects people from shock, while an AFCI recognizes the electrical signature of arcing and protects the building from fire. Neither one takes the place of ordinary overload and short-circuit protection.
Source: NAAEI CAMT Electrical Maintenance and Repair course, GFCI and AFCI protectionReport a problem with this question
6. Water from a supply-line leak has soaked the wall around a receptacle, and the circuit is still energized. What should the technician do FIRST?
- A.Reset the tripped breaker until it holds, then close up the wall
- B.Shut the circuit off at the panel before handling the wet device✓ Answer
- C.Dry the wall with a fan and keep the circuit in service meanwhile
- D.Pull the device out with insulated gloves while the circuit is live
Water is a conducting path, so a wet device offers electricity an easy route to earth through anyone who touches it. Making the situation safe means removing the energy first: open the circuit at the panel and verify the device is dead before any handling, drying or inspection.
Source: NFPA 70E safe electrical work practices, de-energizing before workReport a problem with this question
7. During a make-ready a technician presses the TEST button on a GFCI receptacle and the device does not trip. What does this indicate?
- A.The circuit is overloaded and appliances should be moved elsewhere
- B.The device has failed and must be replaced before the unit is occupied✓ Answer
- C.The device is working, since a healthy GFCI holds under the test
- D.The upstream breaker is weak and should be cycled fully off, then on
The test button deliberately creates a small imbalance so the device can prove it will open. A GFCI that does not trip when tested has lost its sensing or tripping function and is providing no shock protection at all, so it must be replaced rather than left in service.
Source: NAAEI CAMT Electrical Maintenance and Repair course, testing GFCI devicesReport a problem with this question
8. A GFCI receptacle has tripped and will not reset, even with everything unplugged from it. What is the MOST likely explanation?
- A.The reset button must be pressed twice quickly to clear its memory
- B.A ground fault remains on the circuit, or the device itself has failed✓ Answer
- C.A tripped GFCI cannot be reset by hand and is always replaced
- D.The receptacle is overloaded and needs a breaker of a higher rating
A GFCI holds its reset only when the current going out and the current coming back are balanced. If it will not latch with the load removed, either the fault is in the permanent wiring downstream of the device or the GFCI itself has failed, and both possibilities call for testing rather than repeated reset attempts.
Source: NAAEI CAMT Electrical Maintenance and Repair course, GFCI troubleshootingReport a problem with this question
9. Which statement correctly describes the roles of the grounded (neutral) conductor and of bonding?
- A.The grounding conductor carries return current, and bonding isolates metal
- B.The neutral carries fault current, and bonding joins metal parts to earth
- C.The neutral and grounding conductor share the return current in normal use
- D.The neutral returns normal current, and bonding ties metal to the fault path✓ Answer
In normal operation current leaves the panel on the hot conductor and comes back on the grounded neutral. Bonding connects metal enclosures, boxes and equipment together so that a fault reaching them has a low-resistance path back to the source, which lets the breaker open instead of leaving the metal energized.
Source: NAAEI CAMT Electrical Maintenance and Repair course, grounding and bondingReport a problem with this question
10. Why must the grounded (neutral) conductor and the equipment grounding conductor never be interchanged or joined together at a receptacle?
- A.The breaker would no longer carry the amperage it is rated to carry
- B.The plug polarity would reverse and the device would run backwards on load
- C.Normal return current would then flow on metal parts a person can touch✓ Answer
- D.The white conductor would overheat because it is of a smaller gauge
The grounding conductor is meant to carry current only during a fault, so it is bonded to every metal part a person may touch. If it is used as a return path, ordinary working current flows over those touchable surfaces, and a break anywhere in that path leaves them energized with no warning.
Source: NAAEI CAMT Electrical Maintenance and Repair course, grounded and grounding conductorsReport a problem with this question
11. A technician opens a device box and finds a white conductor with black tape wrapped around its end. What is the correct interpretation, and what should the technician do?
- A.It is an equipment grounding conductor and belongs on the green screw
- B.It has been re-identified as a hot conductor, so verify it with a tester✓ Answer
- C.It is a spare left by the installer and can be capped off and ignored
- D.It is still a neutral and can be landed on the silver terminal safely
A white conductor marked in black has been re-identified as a hot conductor, a common practice in switch loops and older work. Color coding is only a starting point, however, so the technician confirms which conductor is energized with a tester or meter before touching or landing anything.
Source: NAAEI CAMT Electrical Maintenance and Repair course, conductor identification and color codingReport a problem with this question
12. A technician is replacing a damaged duplex receptacle in an apartment. Where does each conductor land on the new device?
- A.White to the green screw, black to silver, ground to brass terminal
- B.White to silver, black to brass, and the ground to the green screw✓ Answer
- C.White to silver, black to green, and the ground to the brass screw
- D.White to brass, black to silver, and the ground to the brass screw
The terminal colors on a receptacle identify their function: silver takes the grounded neutral, brass takes the hot conductor and the green screw takes the equipment ground. Keeping that arrangement preserves correct polarity so the shell of a lamp socket, for example, stays on the neutral side rather than the energized one.
Source: NAAEI CAMT Electrical Maintenance and Repair course, receptacle replacementReport a problem with this question
13. A hallway light is controlled from two doorways, and one of the switches must be replaced. Which replacement device is correct?
- A.A dimmer with two terminals, wired to whichever traveler is handy
- B.A double-pole breaker used as a switch for the same light fixture
- C.A single-pole switch, which has two screw terminals and one control point
- D.A three-way switch, which has three screw terminals and works in pairs✓ Answer
Control from two locations requires a matched pair of three-way switches, each with three screw terminals: one common terminal plus two travelers that route the hot conductor between the switches. A two-terminal single-pole device cannot make that connection, and the replacement must also match the original ratings and wire compatibility marking.
Source: NAAEI CAMT Electrical Maintenance and Repair course, three-way switchesReport a problem with this question
14. While replacing a ceiling fixture, a technician finds the existing conductors are too short to work with. What is the correct fix?
- A.Stretch the conductors and back-stab them into the fixture terminals
- B.Splice on longer conductors and push the splice up into the ceiling
- C.Choose a smaller fixture that reaches the conductors where they sit
- D.Add pigtails of matching gauge and color, spliced inside the box✓ Answer
Short conductors are lengthened with pigtails that match the existing wire in gauge and color, joined with a properly sized wire connector. Every splice must stay inside an enclosed, covered box so that heat, arcing or a loose joint is contained rather than left in a concealed ceiling cavity.
Source: NAAEI CAMT Electrical Maintenance and Repair course, splices, pigtails and boxesReport a problem with this question
15. A fluorescent fixture in a laundry room hums loudly and shows dark oily residue around the ballast housing. Which component is MOST likely the failed one?
- A.The lamp, which has reached the end of its service life
- B.The diffuser, which traps heat and distorts the output
- C.The wall switch, which no longer completes the hot conductor
- D.The ballast, which regulates current to the lamp sockets✓ Answer
Loud humming and dark oily seepage are the classic signs of a ballast breaking down internally, because the ballast is a transformer whose windings and potting compound overheat as it fails. The replacement must have the same electrical ratings, and when a ballast costs nearly as much as the luminaire, replacing the whole fixture is the practical call.
Source: NAAEI CAMT Electrical Maintenance and Repair course, fluorescent fixtures and ballastsReport a problem with this question
16. An LED fixture in a common area flickers and then goes dark, and its light engine has no replaceable lamp. Which component should be suspected FIRST?
- A.The driver, which conditions the power for the LED module✓ Answer
- B.The diffuser lens, which yellows and blocks the light output
- C.The ballast, which every LED fixture uses to strike the lamp
- D.The starter, which older fixtures use to warm the electrodes
An LED luminaire has no ballast and no starter; its power supply is a driver that converts and regulates the incoming power for the light engine. Because the diodes themselves rarely fail first, flickering followed by darkness usually points at the driver or its connections, and on a sealed engine the repair is a driver or whole-fixture replacement.
Source: NAAEI CAMT Electrical Maintenance and Repair course, light fixtures and lamp sourcesReport a problem with this question
17. Several receptacles in one bedroom are dead while the rest of the apartment works. Which sequence should the technician follow?
- A.Open the ceiling fixture first, then check the panel and the GFCI
- B.Give the resident an extension cord and reinspect it on a later visit
- C.Replace every receptacle in the room, and then look at the panel
- D.Check the panel and any upstream GFCI, then test at the dead outlets✓ Answer
Good troubleshooting moves from the simplest and least invasive check outward. A tripped breaker or a tripped GFCI feeding the rest of the run explains a whole group of dead outlets far more often than several failed devices do, so those are checked before any wiring is opened up.
Source: NAAEI CAMT Electrical Maintenance and Repair course, diagnosing branch circuitsReport a problem with this question
18. What is the correct way to use a voltage tester before working on a circuit that has been switched off?
- A.Test the circuit once and take a silent tester as proof it is dead
- B.Prove the tester on a known live source before and after the test✓ Answer
- C.Test the circuit, then confirm the reading with the back of a hand
- D.Prove the tester only after the work, since that is the last check
A tester with a dead battery or a broken lead gives the same quiet, comforting result as a de-energized circuit. Proving it on a source known to be live, testing the conductors, then proving it again on the live source confirms the instrument was working for the whole check, and nothing is ever verified by touch.
Source: NFPA 70E safe electrical work practices, test to verify absence of voltageReport a problem with this question
19. During a make-ready the technician finds dull silver-colored branch-circuit conductors and devices with darkened terminals. What is the correct response?
- A.Stop and have a licensed electrician evaluate the aluminum wiring✓ Answer
- B.Twist the aluminum and copper together under a standard wire nut
- C.Sand the conductor ends bright and reuse the existing receptacles
- D.Land the conductors on any standard device and tighten the screws
Dull silver conductors indicate aluminum branch-circuit wiring, and darkened terminals suggest the overheating that loose or incompatible connections cause at aluminum terminations. This legacy condition needs devices and methods specifically listed for aluminum and belongs to a licensed electrician, with local requirements verified before any work proceeds.
Source: NAAEI CAMT Electrical Maintenance and Repair course, wire types and when to call an electricianReport a problem with this question
20. A resident reports a burning smell, and the technician finds a receptacle that is warm to the touch and scorched around one slot. What should the technician do FIRST?
- A.De-energize the circuit at the panel and verify the outlet is dead✓ Answer
- B.Tighten the cover-plate screws and schedule a follow-up next week
- C.Tell the resident to use fewer appliances on that outlet for now
- D.Plug in a receptacle tester to see whether the wiring is reversed
Heat, scorching and a burning smell mean a connection is already arcing or running hot, which is an active fire hazard rather than a service inconvenience. The circuit is opened at the panel and verified dead before anything else, and only then is the cause investigated, which is typically a loose termination, an overloaded circuit or an undersized conductor.
Source: NAAEI CAMT Electrical Maintenance and Repair course, receptacle problems and electrical fire hazardsReport a problem with this question

Practice questions based on the published NAAEI CAMT domains — Essential Trade Skills, Compliance, Facilities Operations, and Professional Development & Collaboration — and on standard trade practice. CAMT and NAAEI are marks of the National Apartment Association; this site is not affiliated with or endorsed by NAA or NAAEI. Code requirements, licensing boundaries and permit rules vary by jurisdiction and revise on a cycle, so none is tested here as a recalled figure — always verify the code having jurisdiction and use a licensed contractor where the work requires one. Confirm current program requirements with NAAEI before testing. About the CAMT credential →

1. A branch circuit is drawing more current than its conductors and breaker were designed to carry. Which condition is this, and how does the protective device respond?

2. Which description BEST defines a short circuit?

3. A resident reports a tingle when touching a plugged-in hair dryer while standing at a wet sink. Which condition is MOST likely present, and which device is designed to sense it?

4. A kitchen circuit breaker has tripped three times in one week. The technician has already moved two plug-in appliances to another circuit and it tripped again. What should the technician do NEXT?

5. Which statement correctly matches each protective device to the hazard it senses?

6. Water from a supply-line leak has soaked the wall around a receptacle, and the circuit is still energized. What should the technician do FIRST?

7. During a make-ready a technician presses the TEST button on a GFCI receptacle and the device does not trip. What does this indicate?

8. A GFCI receptacle has tripped and will not reset, even with everything unplugged from it. What is the MOST likely explanation?

9. Which statement correctly describes the roles of the grounded (neutral) conductor and of bonding?

10. Why must the grounded (neutral) conductor and the equipment grounding conductor never be interchanged or joined together at a receptacle?

11. A technician opens a device box and finds a white conductor with black tape wrapped around its end. What is the correct interpretation, and what should the technician do?

12. A technician is replacing a damaged duplex receptacle in an apartment. Where does each conductor land on the new device?

13. A hallway light is controlled from two doorways, and one of the switches must be replaced. Which replacement device is correct?

14. While replacing a ceiling fixture, a technician finds the existing conductors are too short to work with. What is the correct fix?

15. A fluorescent fixture in a laundry room hums loudly and shows dark oily residue around the ballast housing. Which component is MOST likely the failed one?

16. An LED fixture in a common area flickers and then goes dark, and its light engine has no replaceable lamp. Which component should be suspected FIRST?

17. Several receptacles in one bedroom are dead while the rest of the apartment works. Which sequence should the technician follow?

18. What is the correct way to use a voltage tester before working on a circuit that has been switched off?

19. During a make-ready the technician finds dull silver-colored branch-circuit conductors and devices with darkened terminals. What is the correct response?

20. A resident reports a burning smell, and the technician finds a receptacle that is warm to the touch and scorched around one slot. What should the technician do FIRST?