Missouri Journeyman Electrician Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the minimum burial depth for PVC conduit under a residential
driveway?
A. 12 inches
B. 18 inches
C. 24 inches
D. 6 inches
Correct Answer: B. 18 inches
Rationale: PVC conduit under residential driveways typically requires
a minimum cover of 18 inches per NEC burial requirements for non-
metallic raceways.
2. The primary purpose of a ground fault circuit interrupter (GFCI) is to:
A. Prevent overloads
B. Protect against short circuits
C. Detect imbalance in current
, D. Increase circuit voltage
Correct Answer: C. Detect imbalance in current
Rationale: A GFCI monitors current flow and trips when it detects
imbalance between hot and neutral, indicating leakage to ground.
3. The standard voltage for residential branch circuits in the U.S. is:
A. 240V
B. 120V
C. 277V
D. 480V
Correct Answer: B. 120V
Rationale: Most residential outlets and lighting circuits operate at
120 volts in the United States.
4. Which device protects against overcurrent conditions?
A. Transformer
B. Circuit breaker
C. Receptacle
D. Switch
Correct Answer: B. Circuit breaker
Rationale: Circuit breakers automatically open a circuit when
excessive current flow occurs.
5. The color of the equipment grounding conductor is typically:
A. White
B. Black
, C. Green
D. Red
Correct Answer: C. Green
Rationale: Green insulation is reserved for equipment grounding
conductors per NEC standards.
6. What is the maximum number of 90-degree bends allowed between
pull points?
A. 2
B. 3
C. 4
D. 5
Correct Answer: C. 4
Rationale: The NEC allows a maximum of 360 degrees total bend
between pull points.
7. A series circuit is characterized by:
A. Multiple paths for current
B. One continuous path for current
C. Equal voltage across all loads
D. No resistance
Correct Answer: B. One continuous path for current
Rationale: In a series circuit, current flows through a single path.
8. Ohm’s Law is expressed as:
A. P = IV
, B. V = IR
C. I = PR
D. R = VI
Correct Answer: B. V = IR
Rationale: Ohm’s Law defines voltage as current multiplied by
resistance.
9. The purpose of a neutral conductor is to:
A. Carry fault current only
B. Provide grounding path
C. Carry return current under normal operation
D. Increase voltage
Correct Answer: C. Carry return current under normal operation
Rationale: Neutral conductors carry current back to the source during
normal operation.
10. What does EMT stand for?
A. Electrical Metallic Tubing
B. External Metal Terminal
C. Electrical Motor Terminal
D. Energy Metallic Tube
Correct Answer: A. Electrical Metallic Tubing
Rationale: EMT is a lightweight, thin-walled conduit used for
electrical wiring.
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the minimum burial depth for PVC conduit under a residential
driveway?
A. 12 inches
B. 18 inches
C. 24 inches
D. 6 inches
Correct Answer: B. 18 inches
Rationale: PVC conduit under residential driveways typically requires
a minimum cover of 18 inches per NEC burial requirements for non-
metallic raceways.
2. The primary purpose of a ground fault circuit interrupter (GFCI) is to:
A. Prevent overloads
B. Protect against short circuits
C. Detect imbalance in current
, D. Increase circuit voltage
Correct Answer: C. Detect imbalance in current
Rationale: A GFCI monitors current flow and trips when it detects
imbalance between hot and neutral, indicating leakage to ground.
3. The standard voltage for residential branch circuits in the U.S. is:
A. 240V
B. 120V
C. 277V
D. 480V
Correct Answer: B. 120V
Rationale: Most residential outlets and lighting circuits operate at
120 volts in the United States.
4. Which device protects against overcurrent conditions?
A. Transformer
B. Circuit breaker
C. Receptacle
D. Switch
Correct Answer: B. Circuit breaker
Rationale: Circuit breakers automatically open a circuit when
excessive current flow occurs.
5. The color of the equipment grounding conductor is typically:
A. White
B. Black
, C. Green
D. Red
Correct Answer: C. Green
Rationale: Green insulation is reserved for equipment grounding
conductors per NEC standards.
6. What is the maximum number of 90-degree bends allowed between
pull points?
A. 2
B. 3
C. 4
D. 5
Correct Answer: C. 4
Rationale: The NEC allows a maximum of 360 degrees total bend
between pull points.
7. A series circuit is characterized by:
A. Multiple paths for current
B. One continuous path for current
C. Equal voltage across all loads
D. No resistance
Correct Answer: B. One continuous path for current
Rationale: In a series circuit, current flows through a single path.
8. Ohm’s Law is expressed as:
A. P = IV
, B. V = IR
C. I = PR
D. R = VI
Correct Answer: B. V = IR
Rationale: Ohm’s Law defines voltage as current multiplied by
resistance.
9. The purpose of a neutral conductor is to:
A. Carry fault current only
B. Provide grounding path
C. Carry return current under normal operation
D. Increase voltage
Correct Answer: C. Carry return current under normal operation
Rationale: Neutral conductors carry current back to the source during
normal operation.
10. What does EMT stand for?
A. Electrical Metallic Tubing
B. External Metal Terminal
C. Electrical Motor Terminal
D. Energy Metallic Tube
Correct Answer: A. Electrical Metallic Tubing
Rationale: EMT is a lightweight, thin-walled conduit used for
electrical wiring.
