100+ Free COREN Electrical Practice Questions

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2026 Statistics

Key Facts: COREN Electrical Exam

100

CBT Questions

COREN

2 hours

Time Limit

COREN

50%

Passing Mark

COREN Guidelines

₦85,000

Application Fee

COREN 2026

4 years

Post-Grad Experience

COREN Requirements

NEMSA

Enforcing Authority

NEMSA Act

The COREN Electrical/Electronic Engineering exam is a 2-hour CBT containing 100 MCQs. It requires a passing score of 50% and has an application fee of ₦85,000. It covers circuit theory, electrical machines, power systems, control systems, electronics, telecommunications, NEMSA/COREN codes, and BEME.

Sample COREN Electrical Practice Questions

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

1A series RLC circuit has resistance R = 10 ohms, inductance L = 0.1 H, and capacitance C = 10 microfarads. What is the resonant frequency (f_r) of the circuit and its quality factor (Q)?

A.159.2 Hz, 10.0

B.159.2 Hz, 100.0

C.503.3 Hz, 10.0

D.1000.0 Hz, 100.0

Explanation: The resonant frequency of a series RLC circuit is given by f_r = 1 / (2 * pi * sqrt(L * C)). Substituting L = 0.1 H and C = 1e-5 F: f_r = 1 / (2 * pi * sqrt(1e-6)) = 1 / (2 * pi * 1e-3) = 1000 / (2 * pi) = 159.15 Hz. The quality factor is Q = omega_r * L / R = (2 * pi * 159.15) * 0.1 / 10 = 1000 * 0.1 / 10 = 10.0. Resonance in series circuits leads to minimum impedance and maximum current.

2In a linear active bilateral network, the open-circuit voltage across two terminals is 24 V. When a 12 ohm resistor is connected across these terminals, the voltage drops to 16 V. Find the Thevenin equivalent resistance (R_th) of the network.

A.4 ohms

B.6 ohms

C.8 ohms

D.12 ohms

Explanation: The open-circuit voltage is the Thevenin voltage (V_th = 24 V). When a load resistor R_L = 12 ohms is connected, the voltage V_L across it is given by the voltage divider: V_L = V_th * R_L / (R_th + R_L). Rearranging: 16 = 24 * 12 / (R_th + 12) => 16 * R_th + 192 = 288 => 16 * R_th = 96 => R_th = 6 ohms. Thevenin's theorem simplifies circuit analysis by reducing complex networks to a single voltage source in series with an impedance.

3An AC voltage source with an internal impedance of Z_s = (8 + j6) ohms delivers power to a load. For maximum power transfer to the load, what must be the load impedance (Z_L)?

A.8 + j6 ohms

B.8 - j6 ohms

C.10 ohms

D.14 ohms

Explanation: For maximum power transfer in AC circuits with a complex source impedance, the load impedance must be the complex conjugate of the source impedance: Z_L = Z_s* = R_s - j * X_s. Given Z_s = 8 + j6 ohms, the load impedance must be Z_L = 8 - j6 ohms. This cancels out the reactive components of the system, leaving the circuit in resonance, which maximizes active power transfer.

4A DC voltage source of 10 V is applied to a series RL circuit with R = 5 ohms and L = 2 H at t = 0. What is the expression for the current i(t) for t >= 0?

A.i(t) = 2(1 - e^(-2.5t)) A

B.i(t) = 2(1 - e^(-0.4t)) A

C.i(t) = 2 * e^(-2.5t) A

D.i(t) = 10(1 - e^(-0.4t)) A

Explanation: The transient current in a series RL circuit connected to a DC source is given by i(t) = (V / R) * (1 - e^(-t / tau)), where tau = L / R is the time constant. Here, steady-state current V / R = 10 / 5 = 2 A, and time constant tau = 2 / 5 = 0.4 seconds. Thus, 1 / tau = 1 / 0.4 = 2.5. The expression is i(t) = 2(1 - e^(-2.5t)) A.

5A symmetric T-network has series arm resistances R1 = R2 = 4 ohms, and a shunt arm resistance R3 = 10 ohms. Find the open-circuit impedance parameters Z_11 and Z_12 of this two-port network.

A.Z_11 = 4 ohms, Z_12 = 10 ohms

B.Z_11 = 14 ohms, Z_12 = 10 ohms

C.Z_11 = 14 ohms, Z_12 = 4 ohms

D.Z_11 = 10 ohms, Z_12 = 14 ohms

Explanation: For a standard T-network, the Z-parameters are given by Z_11 = R1 + R3 and Z_12 = Z_21 = R3. Given R1 = 4 ohms and R3 = 10 ohms, we get Z_11 = 4 + 10 = 14 ohms, and Z_12 = 10 ohms. Z_22 is also R2 + R3 = 14 ohms. Open-circuit impedance parameters represent the voltages at the ports in terms of the port currents when the terminals are open-circuited.

6Three identical resistors of 18 ohms are connected in a delta configuration. What is the value of each equivalent resistor if they are transformed into a star (Y) configuration?

A.54 ohms

B.9 ohms

C.6 ohms

D.18 ohms

Explanation: When transforming a balanced delta network to an equivalent star (Y) network, the star resistance is given by R_Y = R_Delta / 3. Given R_Delta = 18 ohms, the equivalent star resistance is R_Y = 18 / 3 = 6 ohms. The reverse transformation (star to delta) multiplies the resistance by 3.

7A node in a circuit has a voltage V1. Connected to this node are a 2 A independent current source flowing into the node, a 4 ohm resistor connected to ground, and a dependent current source of value 0.5 * V1 flowing out of the node. Calculate V1.

A.1.6 V

B.2.67 V

C.8.0 V

D.4.0 V

Explanation: Using Kirchhoff's Current Law (KCL) at node 1: Sum of currents entering = Sum of currents leaving. Current entering is 2 A. Currents leaving are through the resistor (V1 / 4) and the dependent source (0.5 * V1). Thus: 2 = (V1 / 4) + 0.5 * V1 => 2 = 0.25 * V1 + 0.5 * V1 => 2 = 0.75 * V1 => V1 = 2 / 0.75 = 2.67 V. Dependent sources represent active elements whose characteristics depend on variables elsewhere in the circuit.

8In a linear circuit containing an independent voltage source V = 12 V and an independent current source I = 3 A, the current through a branch is measured. When V acts alone, the branch current is 1.5 A. When I acts alone, the branch current is -0.5 A. What is the total branch current when both sources act simultaneously?

A.1.0 A

B.2.0 A

C.1.8 A

D.3.0 A

Explanation: According to the superposition theorem, the total response (voltage or current) in a linear circuit with multiple independent sources is the algebraic sum of the individual responses caused by each source acting alone. Therefore, the total current is I_total = I_V_alone + I_I_alone = 1.5 A + (-0.5 A) = 1.0 A. Superposition only applies to linear parameters (current, voltage) and cannot be applied to power calculations directly.

9A load consumes 100 kW at a power factor of 0.8 lagging from a 240 V, 50 Hz single-phase supply. What value of shunt capacitor is required to raise the power factor to unity?

A.4.14 millifarads

B.1.38 millifarads

C.2.76 millifarads

D.0.69 millifarads

Explanation: The active power is P = 100 kW. The initial power factor is cos(theta1) = 0.8 lagging, so tan(theta1) = 0.75. The initial reactive power is Q1 = P * tan(theta1) = 100 * 0.75 = 75 kVAR. To achieve unity power factor, the target reactive power is Q2 = 0. The capacitor must supply Q_c = Q1 - Q2 = 75 kVAR = 75,000 VAR. The reactive power of a shunt capacitor is Q_c = V^2 * omega * C. Rearranging for C: C = Q_c / (V^2 * 2 * pi * f) = 75000 / (240^2 * 2 * pi * 50) = 75000 / (57600 * 314.16) = 75000 / 18,095,616 = 4.14 * 10^-3 F = 4.14 mF.

10In a balanced three-phase system, two wattmeters are used to measure the total power. The readings of the two wattmeters are W1 = 5 kW and W2 = 2.5 kW. What is the power factor of the system?

A.0.500

B.0.866

C.0.707

D.0.982

Explanation: For the two-wattmeter method, total active power P = W1 + W2 = 7.5 kW, and total reactive power Q = sqrt(3) * (W1 - W2) = sqrt(3) * (5 - 2.5) = 2.5 * sqrt(3) = 4.33 kVAR. The phase angle theta is given by tan(theta) = Q / P = 4.33 / 7.5 = 0.577. Thus, theta = arctan(0.577) = 30 degrees. The power factor is cos(30) = 0.866. Since both readings are positive, the power factor must be greater than 0.5.

About the COREN Electrical Exam

The COREN Engineering Practice Exam for Electrical/Electronic Engineering validates professional competency, technical knowledge, and ethical readiness. It is a mandatory milestone for graduate engineers seeking registration as Registered Engineers (R.Eng) in Nigeria. The exam evaluates core electrical principles—such as circuit theory, machines, power systems, control engineering, and telecommunications—alongside Nigerian electrical regulations (NEMSA), national standards (NIS), and professional codes of conduct.

Assessment

100 multiple-choice questions (CBT)

Time Limit

2 hours

Passing Score

50%

Exam Fee

₦85,000 (Council for the Regulation of Engineering in Nigeria (COREN))

COREN Electrical Exam Content Outline

15%

Circuit Theory & Network Analysis

DC and AC circuit analysis, transient and steady-state responses, network theorems, resonance, and three-phase circuits.

15%

Electrical Machines & Electromagnetics

Transformers, DC machines, induction motors, synchronous machines, magnetic circuits, and electromagnetic fields.

20%

Power Systems & Protection

Power generation, transmission line parameters, load flow, symmetrical and unsymmetrical fault analysis, distribution networks, switchgear, and protective relays.

15%

Control Systems & Instrumentation

Feedback control systems, transfer functions, stability (Routh-Hurwitz, Nyquist), state-space analysis, sensors, transducers, and signal conditioning.

20%

Electronics & Telecommunications

Operational amplifiers, diodes, transistors (BJT, MOSFET), digital logic circuits, microcontrollers, modulation techniques, signal transmission, and telecommunication networks.

15%

Professional Practice & Ethics

COREN Act, NSE Code of Conduct, NEMSA Act and safety regulations, Nigerian Industrial Standards (NIS), HSE practices, and Bill of Engineering Measurement and Evaluation (BEME).

How to Pass the COREN Electrical Exam

What You Need to Know

Passing score: 50%
Assessment: 100 multiple-choice questions (CBT)
Time limit: 2 hours
Exam fee: ₦85,000

Keys to Passing

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

COREN Electrical Study Tips from Top Performers

1Master transient analysis of RC, RL, and RLC circuits, as well as the application of theorems like Thevenin's and Norton's to AC systems.

2Understand the equivalent circuit of transformers, and the slip-torque characteristics of three-phase induction motors.

3Review symmetrical components (positive, negative, and zero sequence) for calculating unsymmetrical faults on transmission lines.

4Memorize the functions and requirements of NEMSA (Nigerian Electricity Management Services Agency) for inspection and certification.

5Understand the key components of the Bill of Engineering Measurement and Evaluation (BEME) and how electrical installations are priced in Nigeria.

6Familiarize yourself with basic op-amp circuits, truth tables of logic gates, and standard modulation techniques (AM, FM, QAM).

Frequently Asked Questions

What is the COREN Electrical/Electronic Engineering specialisation exam?

It is the professional practice examination administered by COREN for graduate electrical and electronic engineers in Nigeria. Passing this exam, along with the subsequent oral interview, grants the title of Registered Engineer (R.Eng) and the legal right to practice engineering in Nigeria.

What is the format and duration of the COREN exam?

The exam is a Computer-Based Test (CBT) consisting of 100 multiple-choice questions, with a time limit of 2 hours (120 minutes). In addition to the CBT, candidates must submit technical reports and undergo an oral interview/defense.

What is the passing score for the exam?

The passing score for the COREN Engineering Practice Exam is typically 50%. Candidates must show competency across both the technical and the professional regulation/ethics sections.

How much does the application and registration process cost?

The application and processing fee for registration is ₦85,000. Upon passing the exam and interview, a separate induction fee of approximately ₦68,000 is required for full registration.

What topics are tested in the Electrical Engineering specialisation paper?

The exam covers six core areas: Circuit Theory & Network Analysis (15%), Electrical Machines & Electromagnetics (15%), Power Systems & Protection (20%), Control Systems & Instrumentation (15%), Electronics & Telecommunications (20%), and Professional Practice & Ethics (15%).