Ct Limited Electrical Journeyperson
(E-4) Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A| Instant
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1. Which of the following is the primary purpose of a ground fault circuit
interrupter (GFCI)?
A) Increase circuit voltage
B) Protect equipment from overcurrent
C) Protect people from electrical shock
D) Reduce resistance in a circuit
Rationale:
GFCIs detect leakage currents and interrupt the circuit to prevent electrical
shock.
2. According to the Canadian Electrical Code, what is the minimum wire
size for a 20-ampere general-purpose branch circuit in residential
wiring?
A) 10 AWG
B) 12 AWG
C) 14 AWG
D) 16 AWG
Rationale:
12 AWG copper wire is standard for 20-ampere branch circuits in
residential applications.
, 3. In a three-phase, four-wire system, the voltage between any phase and
neutral is 120 V, and the line-to-line voltage is:
A) 120 V
B) 208 V
C) 208 V (√3 × 120 V)
D) 240 V
Rationale:
Line-to-line voltage in a wye system is √3 times the phase voltage.
4. Which of the following devices is used to step down voltage in an
electrical distribution system?
A) Circuit breaker
B) Transformer
C) Fuse
D) Capacitor
Rationale:
Transformers change voltage levels between circuits without altering
frequency.
5. What is the function of a fuse in an electrical circuit?
A) Convert AC to DC
B) Protect the circuit from overcurrent
C) Increase voltage
D) Reduce resistance
Rationale:
A fuse melts when current exceeds its rating, interrupting the circuit and
preventing damage.
6. Which type of motor is commonly used for variable-speed
applications?
A) Synchronous motor
B) AC induction motor with VFD
C) Stepper motor
D) Universal motor
, Rationale:
AC induction motors paired with variable frequency drives (VFDs) allow
precise speed control.
7. The color code for grounding conductors in Canada is:
A) Red
B) Black
C) Green or bare
D) White
Rationale:
Green or bare copper is used for protective grounding conductors.
8. In electrical theory, Ohm's Law is expressed as:
A) P = V × I
B) V = I × R
C) I = P / V
D) R = P / I
Rationale:
Ohm’s Law defines the relationship between voltage, current, and
resistance.
9. What is the maximum allowable voltage drop for a branch circuit
according to best practice?
A) 1%
B) 2%
C) 3%
D) 5%
Rationale:
A 3% maximum voltage drop ensures efficient operation of equipment.
10. Which type of conduit is most suitable for outdoor, wet
locations?
A) EMT
B) PVC
(E-4) Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A| Instant
Download Pdf
1. Which of the following is the primary purpose of a ground fault circuit
interrupter (GFCI)?
A) Increase circuit voltage
B) Protect equipment from overcurrent
C) Protect people from electrical shock
D) Reduce resistance in a circuit
Rationale:
GFCIs detect leakage currents and interrupt the circuit to prevent electrical
shock.
2. According to the Canadian Electrical Code, what is the minimum wire
size for a 20-ampere general-purpose branch circuit in residential
wiring?
A) 10 AWG
B) 12 AWG
C) 14 AWG
D) 16 AWG
Rationale:
12 AWG copper wire is standard for 20-ampere branch circuits in
residential applications.
, 3. In a three-phase, four-wire system, the voltage between any phase and
neutral is 120 V, and the line-to-line voltage is:
A) 120 V
B) 208 V
C) 208 V (√3 × 120 V)
D) 240 V
Rationale:
Line-to-line voltage in a wye system is √3 times the phase voltage.
4. Which of the following devices is used to step down voltage in an
electrical distribution system?
A) Circuit breaker
B) Transformer
C) Fuse
D) Capacitor
Rationale:
Transformers change voltage levels between circuits without altering
frequency.
5. What is the function of a fuse in an electrical circuit?
A) Convert AC to DC
B) Protect the circuit from overcurrent
C) Increase voltage
D) Reduce resistance
Rationale:
A fuse melts when current exceeds its rating, interrupting the circuit and
preventing damage.
6. Which type of motor is commonly used for variable-speed
applications?
A) Synchronous motor
B) AC induction motor with VFD
C) Stepper motor
D) Universal motor
, Rationale:
AC induction motors paired with variable frequency drives (VFDs) allow
precise speed control.
7. The color code for grounding conductors in Canada is:
A) Red
B) Black
C) Green or bare
D) White
Rationale:
Green or bare copper is used for protective grounding conductors.
8. In electrical theory, Ohm's Law is expressed as:
A) P = V × I
B) V = I × R
C) I = P / V
D) R = P / I
Rationale:
Ohm’s Law defines the relationship between voltage, current, and
resistance.
9. What is the maximum allowable voltage drop for a branch circuit
according to best practice?
A) 1%
B) 2%
C) 3%
D) 5%
Rationale:
A 3% maximum voltage drop ensures efficient operation of equipment.
10. Which type of conduit is most suitable for outdoor, wet
locations?
A) EMT
B) PVC
