Missouri Journeyman Electrician Exam
Questions and Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To guarantee electrical equipment performance
B. To establish minimum requirements for electrical safety
C. To reduce construction costs
D. To replace local building codes
Answer: B. To establish minimum requirements for electrical safety
Rationale: The NEC is intended to provide practical safeguarding of
persons and property from hazards arising from the use of electricity.
It establishes minimum safety standards for electrical installations but
does not guarantee efficiency, convenience, or equipment
performance.
, 2. A continuous load is defined as one where the maximum current
is expected to continue for at least:
A. 30 minutes
B. 1 hour
C. 2 hours
D. 3 hours
Answer: D. 3 hours
Rationale: According to the NEC, a continuous load is one where the
maximum current is expected to continue for three hours or more.
Continuous loads require branch circuits and overcurrent devices to be
sized accordingly.
3. What is the minimum conductor ampacity required for a 40-amp
continuous load?
A. 40 amps
B. 45 amps
C. 50 amps
D. 60 amps
Answer: C. 50 amps
,Rationale: Continuous loads must be multiplied by 125%. Therefore,
40 × 1.25 = 50 amps. The conductor must have an ampacity of at least
50 amps.
4. Which conductor is typically identified by white or gray insulation?
A. Equipment grounding conductor
B. Ungrounded conductor
C. Neutral conductor
D. Bonding jumper
Answer: C. Neutral conductor
Rationale: The NEC requires grounded (neutral) conductors to be
identified by white or gray insulation or by three continuous white
stripes on insulation other than green.
5. What is the purpose of bonding?
A. Increase voltage
B. Reduce conductor resistance
C. Ensure electrical continuity of metal parts
D. Prevent voltage drop
, Answer: C. Ensure electrical continuity of metal parts
Rationale: Bonding connects conductive metal parts together to
establish electrical continuity and provide an effective ground-fault
current path.
6. Which instrument measures electrical resistance?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Wattmeter
Answer: C. Ohmmeter
Rationale: An ohmmeter measures resistance in ohms. Resistance
measurements should only be made on de-energized circuits.
7. Ohm's Law states that voltage equals:
A. Current divided by resistance
B. Current multiplied by resistance
C. Resistance divided by current
D. Power multiplied by current
Questions and Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To guarantee electrical equipment performance
B. To establish minimum requirements for electrical safety
C. To reduce construction costs
D. To replace local building codes
Answer: B. To establish minimum requirements for electrical safety
Rationale: The NEC is intended to provide practical safeguarding of
persons and property from hazards arising from the use of electricity.
It establishes minimum safety standards for electrical installations but
does not guarantee efficiency, convenience, or equipment
performance.
, 2. A continuous load is defined as one where the maximum current
is expected to continue for at least:
A. 30 minutes
B. 1 hour
C. 2 hours
D. 3 hours
Answer: D. 3 hours
Rationale: According to the NEC, a continuous load is one where the
maximum current is expected to continue for three hours or more.
Continuous loads require branch circuits and overcurrent devices to be
sized accordingly.
3. What is the minimum conductor ampacity required for a 40-amp
continuous load?
A. 40 amps
B. 45 amps
C. 50 amps
D. 60 amps
Answer: C. 50 amps
,Rationale: Continuous loads must be multiplied by 125%. Therefore,
40 × 1.25 = 50 amps. The conductor must have an ampacity of at least
50 amps.
4. Which conductor is typically identified by white or gray insulation?
A. Equipment grounding conductor
B. Ungrounded conductor
C. Neutral conductor
D. Bonding jumper
Answer: C. Neutral conductor
Rationale: The NEC requires grounded (neutral) conductors to be
identified by white or gray insulation or by three continuous white
stripes on insulation other than green.
5. What is the purpose of bonding?
A. Increase voltage
B. Reduce conductor resistance
C. Ensure electrical continuity of metal parts
D. Prevent voltage drop
, Answer: C. Ensure electrical continuity of metal parts
Rationale: Bonding connects conductive metal parts together to
establish electrical continuity and provide an effective ground-fault
current path.
6. Which instrument measures electrical resistance?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Wattmeter
Answer: C. Ohmmeter
Rationale: An ohmmeter measures resistance in ohms. Resistance
measurements should only be made on de-energized circuits.
7. Ohm's Law states that voltage equals:
A. Current divided by resistance
B. Current multiplied by resistance
C. Resistance divided by current
D. Power multiplied by current
