NORTH CAROLINA LIMITED ELECTRICAL CONTRACTOR EXAM – PRACTICE TEST 300 QUESTIONS WITH CORRECT ANSWERS & RATIONALES LATEST UPDATE 2026 | VERIFIED MCQs

NORTH CAROLINA LIMITED ELECTRICAL CONTRACTOR
EXAM – PRACTICE TEST 300 QUESTIONS WITH CORRECT
ANSWERS & RATIONALES LATEST UPDATE 2026 |
VERIFIED MCQs
EXAM STRUCTURE & CONTENT AREAS:
1. Electrical Theory & Fundamentals ...................... 50 Questions
2. National Electrical Code (NEC) Compliance .............. 60 Questions
3. Grounding & Bonding ................................... 40 Questions
4. Wiring Methods & Materials ............................ 40 Questions
5. Overcurrent Protection & Load Calculations ............. 40 Questions
6. Motors, Controls & Equipment .......................... 25 Questions
7. North Carolina Licensing Laws & Regulations ........... 25 Questions
8. Electrical Safety & OSHA Standards .................... 20 Questions



SECTION 1: ELECTRICAL THEORY & FUNDAMENTALS
Question 1:
Ohm's Law is expressed by which of the following equations?
A) P = VI
B) V = IR
C) I = P/V
D) R = V²/I
Answer: B
Rationale: Ohm's Law states that voltage (V) equals current (I) times resistance
(R). V = IR is the fundamental relationship.[reference:1]

Question 2:
In a series circuit, which of the following remains constant?
A) Voltage across each component
B) Current through each component
C) Resistance of each component
D) Power dissipated by each component
Answer: B

,Rationale: In a series circuit, the current is the same through all components.
Voltage divides across each resistance based on the voltage divider principle.

Question 3:
What is the power dissipated by a 240V, 10A load?
A) 1,200 W
B) 1,800 W
C) 2,400 W
D) 3,600 W
Answer: C
Rationale: P = V × I = 240V × 10A = 2,400 watts (2.4 kW).

Question 4:
What is the resistance of a circuit that draws 5 amperes at 120 volts?
A) 12 Ω
B) 24 Ω
C) 60 Ω
D) 600 Ω
Answer: B
Rationale: R = V/I = 120V / 5A = 24 ohms.

Question 5:
In a parallel circuit, which of the following remains constant?
A) Current through each branch
B) Voltage across each branch
C) Resistance of each branch
D) Power in each branch
Answer: B
Rationale: In a parallel circuit, the voltage is the same across all branches.
Current divides based on branch resistance.

Question 6:
What is the total resistance of two 10-ohm resistors connected in parallel?

,A) 5 Ω
B) 10 Ω
C) 15 Ω
D) 20 Ω
Answer: A
Rationale: For two equal resistors in parallel: R_total = R/n = 10/2 = 5 ohms.
For unequal resistors: 1/R_total = 1/R1 + 1/R2.

Question 7:
Alternating current (AC) changes direction:
A) Never
B) Periodically
C) Only in DC circuits
D) Randomly
Answer: B
Rationale: AC current reverses direction periodically, typically at 60 Hz in
North America (60 cycles per second).

Question 8:
What is the frequency of standard AC power in North America?
A) 50 Hz
B) 60 Hz
C) 100 Hz
D) 120 Hz
Answer: B
Rationale: Standard AC power in North America operates at 60 Hz. Europe and
other regions use 50 Hz.

Question 9:
What is the effective (RMS) voltage of a 120V AC circuit?
A) 120V
B) 169.7V
C) 84.8V

, D) 240V
Answer: A
Rationale: 120V AC is the RMS (root mean square) value. The peak voltage is
120V × √2 ≈ 169.7V.

Question 10:
What is the peak voltage of a standard 120V AC circuit?
A) 120V
B) 169.7V
C) 84.8V
D) 240V
Answer: B
Rationale: Peak voltage = RMS voltage × √2 = 120V × 1.414 = 169.7V.

Question 11:
A transformer is used to:
A) Change AC voltage levels
B) Change DC voltage levels
C) Store electrical energy
D) Convert AC to DC
Answer: A
Rationale: Transformers use electromagnetic induction to change AC voltage
levels (step-up or step-down).

Question 12:
What is the turns ratio of a transformer that steps 240V down to 120V?
A) 1:1
B) 2:1
C) 1:2
D) 4:1
Answer: B
Rationale: Turns ratio = primary voltage / secondary voltage = 240/120 = 2:1.
The primary has twice as many turns as the secondary.