100+ Free NVQ L4 Electrician Practice Questions

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Sri Lanka NVQ Level 4 Refrigeration and Air Conditioning Technician Written Examination (TVEC/DTET)

Practice Questions100 questions

2026 Statistics

Key Facts: NVQ L4 Electrician Exam

60-70%

Pass Rate

TVEC Statistics

50%

Passing Score

Written theory minimum

40-60

Exam Questions

Theory Paper MCQ

25%

Wiring Systems

Largest exam weight

2 Years

RPL Experience

Alternative entry requirement

E40S001

TVEC Code

NCS Standard

The NVQ Level 4 Electrician theory exam tests essential technical, safety, and diagnostic skills required to practice as a licensed electrician in Sri Lanka. Aligned with the TVEC E40S001 National Competency Standard and modern BS 7671 guidelines, candidates must demonstrate complete competence across all modules to earn certification. This qualification is a mandatory pre-condition for official licensing by the Engineering Council of Sri Lanka.

Sample NVQ L4 Electrician Practice Questions

Try these sample questions to test your NVQ L4 Electrician exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A three-phase, star-connected system has a measured line-to-line voltage of 400 V. What is the approximate phase voltage of this system?

A.230 V

B.115 V

C.400 V

D.690 V

Explanation: In a star-connected three-phase system, the relationship between line voltage (V_L) and phase voltage (V_P) is given by V_L = √3 * V_P. Thus, V_P = V_L / √3 = 400 / 1.732 ≈ 230 V.

2In a delta-connected three-phase load, the measured phase current is 10 A. What is the line current supplying the load?

A.17.3 A

B.10.0 A

C.5.8 A

D.30.0 A

Explanation: In a balanced delta connection, the line current (I_L) is equal to √3 times the phase current (I_P). Therefore, I_L = 10 * 1.732 ≈ 17.3 A.

3An industrial electrical installation draws 4 kW of active power and has an apparent power consumption of 5 kVA. What is the power factor of this installation?

A.0.80

B.1.25

C.0.60

D.0.75

Explanation: Power factor (PF) is the ratio of active power (P in kW) to apparent power (S in kVA). PF = P / S = 4 kW / 5 kVA = 0.80.

4A factory installation consumes 8 kW of active power (P) and has an apparent power (S) of 10 kVA. What is the reactive power (Q) drawn by this circuit?

A.6 kVAR

B.2 kVAR

C.18 kVAR

D.9.2 kVAR

Explanation: The relationship between active, reactive, and apparent power is defined by the power triangle: S² = P² + Q². Rearranging gives Q = √(S² - P²) = √(10² - 8²) = √(100 - 64) = √36 = 6 kVAR.

5A 4-pole AC induction motor is connected to a 50 Hz supply. If the rotor runs at an actual speed of 1440 RPM, what is the slip of the motor?

A.4.0%

B.2.0%

C.5.0%

D.6.0%

Explanation: First, calculate synchronous speed: N_s = 120 * f / P = 120 * 50 / 4 = 1500 RPM. Next, calculate slip: s = (N_s - N_r) / N_s = (1500 - 1440) / 1500 = 60 / 1500 = 0.04 or 4.0%.

6A 6-pole alternator operates to generate electricity at a frequency of 50 Hz. At what synchronous speed must the prime mover rotate the rotor?

A.1000 RPM

B.1500 RPM

C.3000 RPM

D.1200 RPM

Explanation: The formula for frequency is f = P * N_s / 120. Rearranging for synchronous speed: N_s = 120 * f / P = 120 * 50 / 6 = 1000 RPM.

7How does increasing the resistance of the field rheostat affect the speed of a DC shunt motor?

A.It increases the motor speed.

B.It decreases the motor speed.

C.It stops the motor completely.

D.It has no effect on the speed.

Explanation: Increasing field resistance decreases field current, which in turn weakens the magnetic flux (Φ). Since speed is inversely proportional to flux (N ∝ E_b / Φ), reducing the flux causes the motor speed to increase. This is known as field weakening.

8A single-phase transformer has a step-down ratio from 230 V to 115 V. If the secondary winding has 200 turns of copper wire, how many turns are on the primary winding?

A.400 turns

B.100 turns

C.200 turns

D.800 turns

Explanation: The turn ratio of a transformer is proportional to the voltage ratio: V_1 / V_2 = N_1 / N_2. Substituting the values: 230 / 115 = N_1 / 200 => 2 = N_1 / 200 => N_1 = 400 turns.

9A 10 Ω heating resistor is connected across a stable 12 V DC power source. What is the minimum power rating the resistor should have to operate safely without burning out?

A.20 W

B.10 W

C.5 W

D.15 W

Explanation: The power dissipated by the resistor is P = V² / R = 12² / 10 = 144 / 10 = 14.4 W. To operate safely without overheating, the resistor should have a power rating higher than the actual power dissipated. 20 W is the closest standard rating that is safe.

10Two resistors with values of 30 Ω and 60 Ω are connected in parallel. What is the equivalent resistance of this parallel combination?

A.20 Ω

B.90 Ω

C.45 Ω

D.15 Ω

Explanation: For two parallel resistors, the equivalent resistance R_eq = (R_1 * R_2) / (R_1 + R_2) = (30 * 60) / (30 + 60) = 1800 / 90 = 20 Ω.

About the NVQ L4 Electrician Exam

The Sri Lanka NVQ Level 4 Electrician written examination (E40S001) measures fundamental knowledge required to install, inspect, test, and maintain electrical systems. The exam covers single and three-phase domestic and industrial wiring, electrical principles and calculations, AC/DC motors and generators, protective switchgear, motor control starters, programmable logic controllers (PLCs), system verification testing (insulation resistance, continuity, polarity), BS 7671 / IEE regulations, occupational health and safety (OHS) protocols, and material cost estimation (BOQs).

Questions

40 scored questions

Time Limit

2 hours

Passing Score

Competency in all units (written theory test usually requires 50% or above)

Exam Fee

Rs. 2,000 (Tertiary and Vocational Education Commission (TVEC), Sri Lanka)

NVQ L4 Electrician Exam Content Outline

20%

Electrical Theory & AC/DC Machines

AC/DC circuit calculations, motors, generators, alternators, transformer turns and losses.

25%

Domestic & Industrial Wiring Systems

Cable sizing, voltage drop limits, conduit/trunking installation, earthing configurations (TT/TN), wiring colors.

20%

Control Systems & Switchgear

DOL/Star-Delta motor control circuits, latching/interlocking logic, switchgear ratings (MCBs/MCCBs), basic PLC ladder logic.

20%

Inspection, Testing & Troubleshooting

Insulation resistance (IR), continuity, polarity, earth loop impedance, phase rotation sequence, diagnostic checks.

15%

Regulations, Safety & Estimation

BS 7671 guidelines, RCD requirements, OHS safety standards, safe isolation, Bill of Quantities (BOQ) cost estimation.

How to Pass the NVQ L4 Electrician Exam

What You Need to Know

Passing score: Competency in all units (written theory test usually requires 50% or above)
Exam length: 40 questions
Time limit: 2 hours
Exam fee: Rs. 2,000

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

NVQ L4 Electrician Study Tips from Top Performers

1Review the differences and installation requirements for TT, TN-S, and TN-C-S earthing configurations.

2Practice electrical circuit calculations, including power factor, active/apparent/reactive power, and synchronous speed/slip calculations for AC motors.

3Memorize BS 7671 cable color codes (L1/L2/L3 = Brown/Black/Grey) and standard conductor cross-sectional areas for lighting and power circuits.

4Understand the electrical control wiring for Direct-On-Line and Star-Delta starters, including how contacts are interlocked for reversing circuits.

5Learn the exact steps and instrument settings for insulation resistance, polarity, continuity, and earth electrode testing.

6Be prepared for estimation questions, including calculating the quantity of conduits and wires and compiling a basic Bill of Quantities (BOQ).

Frequently Asked Questions

What is the passing criteria for the NVQ Level 4 Electrician exam?

The NVQ system evaluates competence. To pass the theory component, candidates must achieve a minimum score (usually 50% or above) in the written paper. Additionally, candidates must successfully complete the hands-on practical skill evaluation supervised by a TVEC-appointed examiner to be certified as 'Competent'.

How does the RPL (Recognition of Prior Learning) pathway work?

Electricians with over 2 years of proven industry experience but no formal certificates can apply for the NVQ Level 4 through NAITA or VTA under the RPL pathway. They undergo a portfolio review, a brief knowledge assessment, and a practical demonstration of their competencies to obtain certification.

Which wiring regulations are followed in the Sri Lanka NVQ Electrician exam?

The Sri Lanka electrical installation standards are closely aligned with the British Standard BS 7671 (IET Wiring Regulations), currently practicing the 18th edition. This includes earthing systems (TT, TN-S, TN-C-S), conductor color codes, and mandatory system verification testing.

What are the core topics tested in the E40S001 written exam?

The exam tests five core areas: electrical theory and calculations, domestic and industrial wiring installation, electrical control systems and switchgear (including DOL/star-delta starters and PLCs), testing/commissioning procedures (continuity, polarity, insulation resistance), and OHS safety standards and cost estimation.

Are there any prerequisites to sit for the Level 4 exam?

Institutional candidates typically need to complete the NVQ Level 3 Electrician course or have equivalent secondary education (G.C.E. O/Ls). RPL candidates need at least 2 years of relevant work experience in the trade to register for the TVEC assessment.