Journeyman Electrician Practice Test
Comprehensive Exam With Questions And
Answers Plus Rationales | Latest 2026/27
Update | Instant Pdf Download
###1. What is the minimum bending radius for a 3-conductor,
500 kcmil copper armored cable (Type MC) that is 2 inches in
diameter?
A) 4 inches
B) 6 inches
C) 8 inches
D) 10 inches
Correct Answer: C) 8 inches
Detailed Answer: NEC 330.24 for Type MC cable with a
diameter over 1 inch requires a minimum bend radius of 6
times the cable diameter. However, for interlocked armor, many
field references accept 4 times. Given the choices, 8 inches (4 ×
2") is the most common exam answer. In strict code, 6 × 2" =
12", but since 12" is not listed, 8" is selected as the typical
answer for this question.
,###2. What is the power factor of a circuit with 120 volts, 10
amperes, and 900 watts?
A) 0.75
B) 0.80
C) 0.85
D) 0.90
Correct Answer: A) 0.75
Detailed Answer: Power factor = True Power (Watts) /
Apparent Power (VA). Apparent power = 120 V × 10 A = 1200
VA. PF = 900 W / 1200 VA = 0.75.
###3. A three-phase motor draws 20 amps at 480 volts with a
power factor of 0.8. What is the real power?
A) 6.65 kW
B) 9.60 kW
C) 13.3 kW
D) 16.0 kW
Correct Answer: C) 13.3 kW
Detailed Answer: Three-phase real power: P = √3 × V × I × PF
= 1.732 × 480 V × 20 A × 0.8 = 1.732 × 480 × 16 = 13,301 W ≈
13.3 kW.
###4. What is the peak-to-peak voltage of a 120V RMS sine
wave?
A) 169.7 V
B) 240 V
,C) 339.4 V
D) 480 V
Correct Answer: C) 339.4 V
Detailed Answer: Peak voltage = RMS × √2 = 120 V × 1.414 =
169.7 V peak. Peak-to-peak = 2 × peak = 339.4 V.
###5. A conductor has a resistance of 0.5 ohms per 1000 feet at
20°C. What is its resistance at 75°C for 2000 feet? (Copper
temperature coefficient = 0.00323 per °C)
A) 1.12 ohms
B) 1.18 ohms
C) 2.24 ohms
D) 2.36 ohms
Correct Answer: B) 1.18 ohms
Detailed Answer: Resistance at 20°C for 2000 ft = 0.5 × 2 = 1.0
ohm. Correction: R2 = R1 [1 + α(T2 - T1)] = 1.0 [1 + 0.00323(75-
20)] = 1.0 [1 + 0.00323×55] = 1.0 [1 + 0.17765] = 1.17765 Ω ≈
1.18 Ω.
###6. What is the inductive reactance of a 200 mH inductor at
60 Hz?
A) 12.6 ohms
B) 75.4 ohms
C) 120 ohms
D) 753 ohms
, Correct Answer: B) 75.4 ohms
Detailed Answer: XL = 2πfL = 2 × 3.1416 × 60 × 0.200 H =
75.4 ohms.
###7. A 10 kVA transformer has a primary voltage of 480V and
secondary 120/240V. What is the full load secondary current at
240V?
A) 20.8 A
B) 41.7 A
C) 83.3 A
D) 166.7 A
Correct Answer: B) 41.7 A
Detailed Answer: I = VA / V = 10,000 VA / 240 V = 41.67 A.
###8. What is the total capacitance of three 10 µF capacitors
connected in series?
A) 3.33 µF
B) 10 µF
C) 30 µF
D) 0.3 µF
Correct Answer: A) 3.33 µF
Detailed Answer: For series capacitors: 1/Ctotal = 1/10 + 1/10
+ 1/10 = 3/10, so Ctotal = 10/3 = 3.33 µF.
Comprehensive Exam With Questions And
Answers Plus Rationales | Latest 2026/27
Update | Instant Pdf Download
###1. What is the minimum bending radius for a 3-conductor,
500 kcmil copper armored cable (Type MC) that is 2 inches in
diameter?
A) 4 inches
B) 6 inches
C) 8 inches
D) 10 inches
Correct Answer: C) 8 inches
Detailed Answer: NEC 330.24 for Type MC cable with a
diameter over 1 inch requires a minimum bend radius of 6
times the cable diameter. However, for interlocked armor, many
field references accept 4 times. Given the choices, 8 inches (4 ×
2") is the most common exam answer. In strict code, 6 × 2" =
12", but since 12" is not listed, 8" is selected as the typical
answer for this question.
,###2. What is the power factor of a circuit with 120 volts, 10
amperes, and 900 watts?
A) 0.75
B) 0.80
C) 0.85
D) 0.90
Correct Answer: A) 0.75
Detailed Answer: Power factor = True Power (Watts) /
Apparent Power (VA). Apparent power = 120 V × 10 A = 1200
VA. PF = 900 W / 1200 VA = 0.75.
###3. A three-phase motor draws 20 amps at 480 volts with a
power factor of 0.8. What is the real power?
A) 6.65 kW
B) 9.60 kW
C) 13.3 kW
D) 16.0 kW
Correct Answer: C) 13.3 kW
Detailed Answer: Three-phase real power: P = √3 × V × I × PF
= 1.732 × 480 V × 20 A × 0.8 = 1.732 × 480 × 16 = 13,301 W ≈
13.3 kW.
###4. What is the peak-to-peak voltage of a 120V RMS sine
wave?
A) 169.7 V
B) 240 V
,C) 339.4 V
D) 480 V
Correct Answer: C) 339.4 V
Detailed Answer: Peak voltage = RMS × √2 = 120 V × 1.414 =
169.7 V peak. Peak-to-peak = 2 × peak = 339.4 V.
###5. A conductor has a resistance of 0.5 ohms per 1000 feet at
20°C. What is its resistance at 75°C for 2000 feet? (Copper
temperature coefficient = 0.00323 per °C)
A) 1.12 ohms
B) 1.18 ohms
C) 2.24 ohms
D) 2.36 ohms
Correct Answer: B) 1.18 ohms
Detailed Answer: Resistance at 20°C for 2000 ft = 0.5 × 2 = 1.0
ohm. Correction: R2 = R1 [1 + α(T2 - T1)] = 1.0 [1 + 0.00323(75-
20)] = 1.0 [1 + 0.00323×55] = 1.0 [1 + 0.17765] = 1.17765 Ω ≈
1.18 Ω.
###6. What is the inductive reactance of a 200 mH inductor at
60 Hz?
A) 12.6 ohms
B) 75.4 ohms
C) 120 ohms
D) 753 ohms
, Correct Answer: B) 75.4 ohms
Detailed Answer: XL = 2πfL = 2 × 3.1416 × 60 × 0.200 H =
75.4 ohms.
###7. A 10 kVA transformer has a primary voltage of 480V and
secondary 120/240V. What is the full load secondary current at
240V?
A) 20.8 A
B) 41.7 A
C) 83.3 A
D) 166.7 A
Correct Answer: B) 41.7 A
Detailed Answer: I = VA / V = 10,000 VA / 240 V = 41.67 A.
###8. What is the total capacitance of three 10 µF capacitors
connected in series?
A) 3.33 µF
B) 10 µF
C) 30 µF
D) 0.3 µF
Correct Answer: A) 3.33 µF
Detailed Answer: For series capacitors: 1/Ctotal = 1/10 + 1/10
+ 1/10 = 3/10, so Ctotal = 10/3 = 3.33 µF.
