Washington Non-Residential Maintenance
Electrician Examination Questions and Correct
Answers (Verified Answers) Plus Rationale
2027 Q&A| Instant Download Pdf
Question 1
What is the primary purpose of a circuit breaker in a branch circuit?
A. To increase circuit voltage
B. To provide overcurrent protection
C. To improve power factor
D. To reduce conductor resistance
Answer: B. To provide overcurrent protection
Rationale: A circuit breaker is designed to interrupt current when an
overcurrent condition occurs. This protects conductors and connected
equipment from damage caused by excessive current.
Question 2
,Which conductor is normally identified by white or gray insulation in a
typical AC circuit?
A. Equipment grounding conductor
B. Ungrounded conductor
C. Grounded conductor
D. Grounding electrode conductor
Answer: C. Grounded conductor
Rationale: The grounded circuit conductor, commonly called the neutral
conductor, is generally identified by white or gray insulation.
Identification requirements help prevent confusion during installation,
maintenance, and troubleshooting.
Question 3
What is the purpose of an equipment grounding conductor?
A. To carry normal circuit current
B. To provide a low-impedance path for fault current
C. To increase the circuit's operating voltage
D. To serve as the grounded conductor
Answer: B. To provide a low-impedance path for fault current
,Rationale: An equipment grounding conductor provides a conductive
path intended to carry fault current back to the source. This helps
protective devices operate quickly when a fault energizes normally non-
current-carrying metal parts.
Question 4
A maintenance electrician finds a receptacle with reversed polarity.
What does this condition mean?
A. The grounding conductor is oversized
B. The neutral and equipment grounding conductors are bonded
incorrectly
C. The ungrounded and grounded conductors are connected to the
wrong terminals
D. The circuit has excessive voltage
Answer: C. The ungrounded and grounded conductors are connected
to the wrong terminals
Rationale: Reversed polarity generally occurs when the hot and neutral
conductors are terminated on the wrong receptacle terminals. Correct
polarity is important for proper operation and electrical safety.
, Question 5
Which instrument is most appropriate for measuring voltage between
two energized conductors?
A. Clamp-on ammeter
B. Voltmeter
C. Megohmmeter
D. Phase-sequence indicator
Answer: B. Voltmeter
Rationale: A voltmeter measures electrical potential difference between
two points. The meter must be properly rated for the circuit voltage and
category, and appropriate safe-work procedures must be followed.
Question 6
What is the main function of a transformer?
A. Convert AC power directly into mechanical power
B. Change AC voltage from one level to another
C. Convert all AC power into DC power
D. Eliminate all circuit current
Answer: B. Change AC voltage from one level to another
Electrician Examination Questions and Correct
Answers (Verified Answers) Plus Rationale
2027 Q&A| Instant Download Pdf
Question 1
What is the primary purpose of a circuit breaker in a branch circuit?
A. To increase circuit voltage
B. To provide overcurrent protection
C. To improve power factor
D. To reduce conductor resistance
Answer: B. To provide overcurrent protection
Rationale: A circuit breaker is designed to interrupt current when an
overcurrent condition occurs. This protects conductors and connected
equipment from damage caused by excessive current.
Question 2
,Which conductor is normally identified by white or gray insulation in a
typical AC circuit?
A. Equipment grounding conductor
B. Ungrounded conductor
C. Grounded conductor
D. Grounding electrode conductor
Answer: C. Grounded conductor
Rationale: The grounded circuit conductor, commonly called the neutral
conductor, is generally identified by white or gray insulation.
Identification requirements help prevent confusion during installation,
maintenance, and troubleshooting.
Question 3
What is the purpose of an equipment grounding conductor?
A. To carry normal circuit current
B. To provide a low-impedance path for fault current
C. To increase the circuit's operating voltage
D. To serve as the grounded conductor
Answer: B. To provide a low-impedance path for fault current
,Rationale: An equipment grounding conductor provides a conductive
path intended to carry fault current back to the source. This helps
protective devices operate quickly when a fault energizes normally non-
current-carrying metal parts.
Question 4
A maintenance electrician finds a receptacle with reversed polarity.
What does this condition mean?
A. The grounding conductor is oversized
B. The neutral and equipment grounding conductors are bonded
incorrectly
C. The ungrounded and grounded conductors are connected to the
wrong terminals
D. The circuit has excessive voltage
Answer: C. The ungrounded and grounded conductors are connected
to the wrong terminals
Rationale: Reversed polarity generally occurs when the hot and neutral
conductors are terminated on the wrong receptacle terminals. Correct
polarity is important for proper operation and electrical safety.
, Question 5
Which instrument is most appropriate for measuring voltage between
two energized conductors?
A. Clamp-on ammeter
B. Voltmeter
C. Megohmmeter
D. Phase-sequence indicator
Answer: B. Voltmeter
Rationale: A voltmeter measures electrical potential difference between
two points. The meter must be properly rated for the circuit voltage and
category, and appropriate safe-work procedures must be followed.
Question 6
What is the main function of a transformer?
A. Convert AC power directly into mechanical power
B. Change AC voltage from one level to another
C. Convert all AC power into DC power
D. Eliminate all circuit current
Answer: B. Change AC voltage from one level to another
