Question 1
A receptacle tester indicates reversed polarity at a duplex receptacle in a dwelling. Which wiring error is MOST likely present?
Question 2
On a standard 15 A, 125 V receptacle, which terminal is connected to the identified (neutral) conductor?
Question 3
You are asked to troubleshoot a receptacle that has no power. Your tester shows no voltage between hot and neutral, but full voltage between hot and ground. What is the most likely issue?
Question 4
A remote three-way lighting circuit only works from one location after renovations. What wiring fault is most likely?
Question 5
A receptacle circuit is found to be incorrectly polarized, with the hot and neutral reversed. What is the main safety concern?
Question 6
In a properly wired lighting circuit with multiple luminaires on one switch, how are the luminaires connected so that each receives full supply voltage?
Question 7
Which conductor must always be disconnected by a single-pole switch in a standard 120 V branch circuit?
Question 8
You are troubleshooting a receptacle circuit where the tester shows correct voltage from hot to neutral, but nearly no voltage from hot to ground. What condition is MOST likely present?
Question 9
You measure 120 V at a receptacle, but a plugged-in lamp does not work. The lamp is known to be good. Which is the best next step in troubleshooting?
Question 10
You measure 120 V between a receptacle hot and neutral, but 0 V between hot and equipment ground. What is the most likely issue?
Question 11
You measure 120 V between phase A and neutral, and 120 V between phase B and neutral, but 0 V between phase A and phase B. What is the most likely explanation?
Question 12
During troubleshooting of a lighting circuit, an apprentice measures 120 V at the switch but zero volts across the lamp holder terminals when the switch is on. What is the most likely fault?
Question 13
During troubleshooting, a receptacle tester indicates an open ground on several outlets in a room. What should the electrician check first?
Question 14
Which condition indicates that a receptacle is wired with reversed polarity?
Question 15
While troubleshooting a lighting circuit, you find 120 V between hot and ground, but 0 V between hot and neutral at a fixture. What is the MOST likely issue?
Question 16
While troubleshooting a 120 V receptacle that reads 120 V hot-to-ground but 0 V hot-to-neutral, what condition is MOST likely?
Question 17
A receptacle with one slot longer than the other is designed for which purpose?
Question 18
A receptacle tester shows hot and neutral reversed on a 120 V receptacle. Which condition is most likely present?
Question 19
In a dwelling unit, several lights are dim and some receptacles show normal voltage with no load but drop close to zero when a load is plugged in. Which condition is most likely?
Question 20
A receptacle tester shows 'hot/neutral reversed' on a 120 V receptacle. Which condition is most likely present?
Question 21
During troubleshooting of a lighting circuit, a journeyperson measures 120 V from hot to ground and 0 V from hot to neutral at a fixture outlet. What is the most likely problem?
Question 22
If a simple lighting circuit has its neutral conductor broken (open) while the hot remains connected, what is the most likely result?
Question 23
Several receptacles on one side of a living room are dead, but the breaker is not tripped and other receptacles on the circuit still work. You discover that one receptacle was recently replaced using backstab connections on the feed-through device. What is the most likely fault?
Question 24
An older multiwire branch circuit with a shared neutral is reconnected in a panel using two separate single-pole AFCI breakers without a handle tie. When loads are applied to both legs, both breakers trip. What wiring issue is MOST likely causing the nuisance tripping?
Question 25
An electrician measures 119 V hot-to-neutral, 119 V hot-to-ground, and nearly 0 V neutral-to-ground at a receptacle. What does this generally indicate?
Question 26
An electrician is troubleshooting why a 120 V receptacle reads about 60 V hot-to-neutral and 60 V hot-to-ground with a digital meter, and nothing is plugged in. What is a likely issue?
Question 27
A receptacle tester indicates an open neutral on a 120 V receptacle. Which symptom would MOST likely be observed at the receptacle?
Question 28
What is a common symptom of an open neutral on a 120 V branch circuit in a dwelling?
Question 29
When troubleshooting a residential circuit, a journeyperson measures $120\text{ V}$ between the hot conductor and the grounding conductor, and $0\text{ V}$ between the hot conductor and the neutral conductor. What is the most likely issue?
Question 30
A receptacle in a kitchen shows 120 V from hot to neutral, but a plug-in tester indicates an open ground. What is the most likely cause?