100+ Free Cameroon Baccalauréat Série F3 Practice Questions

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2026 Statistics

Key Facts: Cameroon Baccalauréat Série F3 Exam

10.00 / 20

Minimum Pass Average

Office du Baccalauréat du Cameroun (OBC)

21,000 FCFA

Total Registration Cost (13,000 + 8,000)

OBC / MINESEC Circular, session 2026

Coefficient 15

Combined weight of the two compulsory practicals

OBC Série F3 timetable, session 2026

The Cameroon Baccalauréat Série F3 is the national technical diploma in electrotechnology administered by OBC, requiring a general average ≥ 10/20 across electrical installations, electrical machines, power electronics, and general STEM subjects.

Sample Cameroon Baccalauréat Série F3 Practice Questions

Try these sample questions to test your Cameroon Baccalauréat Série F3 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In a balanced 3-phase AC distribution network with line-to-line voltage $U = 400\text{ V}$ (50 Hz), what is the line-to-neutral phase voltage $V$?

A.230 V (V = U / √3)

B.400 V

C.200 V

D.690 V

Explanation: In a balanced three-phase star system, the relationship between line-to-line voltage $U$ and line-to-neutral voltage $V$ is $U = \sqrt{3} \cdot V$. Therefore, $V = \frac{U}{\sqrt{3}} = \frac{400\text{ V}}{1.732} \approx 230.94\text{ V} \approx 230\text{ V}$.

2Using Boucherot's method (méthode de Boucherot), how is total active power $P_T$ and total reactive power $Q_T$ calculated for an industrial electrical installation with $n$ parallel loads?

A.P_T = Σ P_i and Q_T = Σ Q_i, and total apparent power is S_T = √(P_T² + Q_T²)

B.S_T = Σ S_i directly by algebraic summation

C.P_T = √(Σ P_i²) and Q_T = √(Σ Q_i²)

D.P_T = Σ P_i / n and Q_T = Σ Q_i / n

Explanation: Boucherot's theorem states that in any AC network, active powers add algebraically ($P_T = \sum P_i$) and reactive powers add algebraically ($Q_T = \sum Q_i$, accounting for inductive $+Q$ and capacitive $-Q$). Apparent powers cannot be added directly algebraically; total apparent power is $S_T = \sqrt{P_T^2 + Q_T^2}$.

3A 3-phase industrial load consumes an active power $P = 45\text{ kW}$ with a lagging power factor $\cos \varphi = 0.80$ when supplied by a $U = 400\text{ V}$ three-phase line. What is the line current $I$ drawn by the load?

A.81.2 A

B.65.0 A

C.140.6 A

D.112.5 A

Explanation: Active power in a three-phase balanced system is $P = \sqrt{3} \cdot U \cdot I \cdot \cos \varphi$. Rearranging for line current: $I = \frac{P}{\sqrt{3} \cdot U \cdot \cos \varphi} = \frac{45000\text{ W}}{\sqrt{3} \times 400\text{ V} \times 0.80} = \frac{45000}{1.73205 \times 400 \times 0.80} = \frac{45000}{554.256} \approx 81.19\text{ A} \approx 81.2\text{ A}$.

4In the standard French/international low-voltage installation code (NFC 15-100 / IEC 60364), what is the maximum permissible percentage voltage drop (chute de tension $\Delta U$) between the origin of the installation and lighting circuits?

A.3% for lighting circuits (and 5% for other power/motor uses when fed from public low-voltage grid)

B.10% for all circuits

C.1% for all circuits

D.15% during continuous operation

Explanation: Under NFC 15-100 / IEC 60364: For installations supplied directly from a public low-voltage grid (tarif bleu), the maximum allowable voltage drop is $3\%$ for lighting circuits and $5\%$ for other applications (motive power, heating). If fed from a private MV/LV substation, the limits are $6\%$ for lighting and $8\%$ for other uses.

5What is the reactive power $Q_c$ required from a capacitor bank to improve the power factor of a factory drawing $P = 100\text{ kW}$ from $\cos \varphi_1 = 0.70$ ($\tan \varphi_1 = 1.020$) to $\cos \varphi_2 = 0.95$ ($\tan \varphi_2 = 0.329$)?

A.69.1 kvar

B.102.0 kvar

C.32.9 kvar

D.134.9 kvar

Explanation: The capacitor bank sizing formula is $Q_c = P \cdot (\tan \varphi_1 - \tan \varphi_2) = 100\text{ kW} \times (1.020 - 0.329) = 100 \times 0.691 = 69.1\text{ kvar}$.

6A 3-phase capacitor bank with total reactive power $Q_c = 60\text{ kvar}$ is connected in delta ($\Delta$) across a $U = 400\text{ V}$ (50 Hz) network. What is the required capacitance $C_\Delta$ for each of the three branch capacitors?

A.398 μF (C_Δ = Q_c / (3 · ω · U²))

B.1194 μF

C.133 μF

D.59.7 μF

Explanation: In delta connection, each capacitor sees the full line-to-line voltage $U = 400\text{ V}$. The reactive power per branch is $Q_{c1} = Q_c / 3 = 20000\text{ var}$. Since $Q_{c1} = C_\Delta \cdot \omega \cdot U^2$: $C_\Delta = \frac{Q_c}{3 \cdot \omega \cdot U^2} = \frac{60000}{3 \times (2\pi \times 50) \times 400^2} = \frac{60000}{3 \times 314.159 \times 160000} = \frac{60000}{150796447} \approx 3.9788 \times 10^{-4}\text{ F} \approx 398\text{ }\mu\text{F}$.

7In the calculation of short-circuit currents by the impedance method (méthode des impédances / C15-105), what is the formula for the prospective 3-phase symmetrical short-circuit current ($I_{cc3}$) at a given point in a network?

A.I_{cc3} = \frac{U_0}{\sqrt{3} \cdot Z_{cc}} = \frac{V_0}{Z_{cc}} = \frac{V_0}{\sqrt{(\sum R)^2 + (\sum X)^2}}

B.I_{cc3} = \frac{U_0}{\sum R + \sum X}

C.I_{cc3} = \frac{P}{\sqrt{3} \cdot U_0}

D.I_{cc3} = \frac{Z_{cc}}{V_0}

Explanation: The 3-phase bolted short-circuit current is driven by the phase-to-neutral open-circuit voltage $V_0 = U_0 / \sqrt{3}$ divided by the total loop upstream impedance per phase $Z_{cc} = \sqrt{R_T^2 + X_T^2}$.

8What is the primary function of the instantaneous magnetic release (déclencheur magnétique) in a low-voltage thermal-magnetic circuit breaker (disjoncteur magnétothermique)?

A.Instantaneous tripping within milliseconds to protect conductors against destructive high-current short-circuits

B.Slow time-delayed thermal tripping to protect against prolonged minor overloads

C.Earth leakage current detection for residual current protection

D.Automatic power factor regulation

Explanation: A thermal-magnetic breaker has two releases: the bimetallic thermal release operates with an inverse-time delay ($I^2 t$) for moderate overloads; the electromagnetic coil (déclencheur magnétique) trips instantaneously (<20 ms) when current spikes into the short-circuit range.

9According to standard IEC 60898 / 60947-2, what is the magnetic instantaneous trip threshold range for a 'Curve C' (Courbe C) circuit breaker?

A.5 to 10 times nominal current (5 In – 10 In)

B.3 to 5 times nominal current (3 In – 5 In)

C.10 to 20 times nominal current (10 In – 20 In)

D.1.13 to 1.45 times nominal current

Explanation: Standard circuit breaker magnetic trip curves: Curve B = $3-5 I_n$ (resistive loads, long cable runs); Curve C = $5-10 I_n$ (standard commercial/domestic general loads, fluorescent lighting, low-surge motors); Curve D = $10-20 I_n$ (heavy inductive starting inrush motors and transformers).

10A 3-phase distribution sub-panel is fed by a 50-meter 4-core copper cable ($S = 25\text{ mm}^2$, resistivity $\rho = 0.0225\text{ }\Omega\cdot\text{mm}^2/\text{m}$). What is the resistance $R$ of each phase conductor?

A.0.045 Ω

B.0.090 Ω

C.0.0225 Ω

D.0.450 Ω

Explanation: Resistance of a single phase conductor is $R = \rho \cdot \frac{L}{S} = 0.0225\text{ }\Omega\cdot\text{mm}^2/\text{m} \times \frac{50\text{ m}}{25\text{ mm}^2} = 0.0225 \times 2 = 0.045\text{ }\Omega$.

About the Cameroon Baccalauréat Série F3 Exam

The Cameroon Baccalauréat Technique Série F3 (Électrotechnique) is the national technical secondary school leaving diploma for students specializing in electrical engineering, power systems, industrial machinery, and automation. Administered by the Office du Baccalauréat du Cameroun (OBC) under the Ministry of Secondary Education (MINESEC), Série F3 qualifies candidates for higher technical education (ENSET, IUT, ENSPY) and electrical utility careers. This 100-question practice bank covers electrical installations, transformers, motors, power electronics, and earthing regimes. Format note: the official examination is written and practical in French; this bank is an English-language MCQ study adaptation designed to build technical problem-solving skills.

Assessment

The national examination is sat in two phases: compulsory written papers, then compulsory practicals for candidates declared admissible. Per the OBC session 2026 timetable for Série F3, the written papers are Installation Électrique (4h, coef 3), Commande de Machines Électriques (3h, coef 3), Électronique de Puissance (3h, coef 3), Mathématiques (3h, coef 3), Sciences Physiques (3h, coef 3), Technologie (3h, coef 2), Français/Philosophie (3h, coef 2), Anglais (2h, coef 2), Éducation à la Citoyenneté et à la Morale (2h, coef 2), Informatique écrite (1h30, coef 2), EPS écrite (2h, coef 2), Histoire ou Géographie (2h, coef 1) and Mécanique (2h, coef 1). The compulsory practicals are Réalisation d'un projet (6h, coef 8) and Essais et Mesures (5h, coef 7), together carrying 15 of the 44 total coefficients.

Time Limit

Written papers spread over five days (21, 22, 25, 26 and 28 May in the 2026 session), ranging from 1h30 to 4h each, plus 11 hours of compulsory practicals

Passing Score

Moyenne générale of at least 10.00/20 across all coefficient-weighted papers

Exam Fee

21,000 FCFA (Office du Baccalauréat du Cameroun (OBC))

Cameroon Baccalauréat Série F3 Exam Content Outline

25%

Installations Électriques Industrielles & Bâtiment

Power demand balance, apparent power S (kVA), transformer capacity selection, conductor sizing, permissible voltage drops (ΔU%), thermal constraints, short-circuit current calculation (Icc), and installation standards (NFC 15-100).

25%

Machines Électriques: Transformateurs, Moteurs & Alternateurs

Single-phase and three-phase transformers (Kapp triangle, efficiency, parallel operation), three-phase asynchronous induction motors (slip, equivalent circuit, torque-speed characteristic, power flow), synchronous generators, and DC machines.

15%

Électronique de Puissance & Variateurs de Vitesse

Uncontrolled diode rectifiers, controlled thyristor rectifiers (Graetz bridge), DC-DC choppers (buck, boost), single/three-phase PWM inverters, harmonic distortion (THD), capacitor bank power factor correction (cos φ), and variable frequency drives (VFDs).

20%

Commande des Machines, Automates Programmables & GRAFCET

Industrial motor starting circuits (direct-on-line DOL, star-delta Y-Δ, autotransformer, stator resistance), reversing contactor interlocking, thermal overload protection, programmable logic controllers (PLCs), ladder diagrams, and GRAFCET sequential controllers.

15%

Régimes de Neutre, Sécurité Électrique & Mathématiques Appliquées

Earthing systems and neutral regimes (TT, TN-C, TN-S, IT), protection against direct/indirect contact, residual current devices (RCDs), circuit breaker trip curves (B, C, D), complex three-phase power calculations (Boucherot method), and symmetric components.

How to Pass the Cameroon Baccalauréat Série F3 Exam

What You Need to Know

Passing score: Moyenne générale of at least 10.00/20 across all coefficient-weighted papers
Assessment: The national examination is sat in two phases: compulsory written papers, then compulsory practicals for candidates declared admissible. Per the OBC session 2026 timetable for Série F3, the written papers are Installation Électrique (4h, coef 3), Commande de Machines Électriques (3h, coef 3), Électronique de Puissance (3h, coef 3), Mathématiques (3h, coef 3), Sciences Physiques (3h, coef 3), Technologie (3h, coef 2), Français/Philosophie (3h, coef 2), Anglais (2h, coef 2), Éducation à la Citoyenneté et à la Morale (2h, coef 2), Informatique écrite (1h30, coef 2), EPS écrite (2h, coef 2), Histoire ou Géographie (2h, coef 1) and Mécanique (2h, coef 1). The compulsory practicals are Réalisation d'un projet (6h, coef 8) and Essais et Mesures (5h, coef 7), together carrying 15 of the 44 total coefficients.
Time limit: Written papers spread over five days (21, 22, 25, 26 and 28 May in the 2026 session), ranging from 1h30 to 4h each, plus 11 hours of compulsory practicals
Exam fee: 21,000 FCFA

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Frequently Asked Questions

What is the Cameroon Baccalauréat Série F3?

The Baccalauréat Série F3 is the official Cameroonian technical high school leaving credential specializing in Électrotechnique (Electrical Engineering and Power Systems). Administered by the OBC under MINESEC, it prepares students for higher engineering institutions (ENSET, IUT, ENSPY) and industrial electrical careers.

What subjects carry the highest weighting in Baccalauréat F3?

On the OBC session 2026 timetable the heaviest components are the two compulsory practicals: Réalisation d'un projet (coefficient 8) and Essais et Mesures (coefficient 7). Among the written papers, Installation Électrique, Commande de Machines Électriques, Électronique de Puissance, Mathématiques and Sciences Physiques each carry coefficient 3.

What is the passing requirement for the Baccalauréat F3?

Candidates must achieve an overall weighted average (Moyenne générale) of at least 10.00/20 across all written, technical, and practical examinations. Candidates who score between 8.00 and 9.99/20 may be considered for deliberation based on their school academic record (livret scolaire).

How does this English-language MCQ practice bank help prepare for the French Bac F3?

This practice bank translates and adapts the core electrical formulas, transformer equations, motor power balance calculations, power factor correction formulas, and earthing fault loop equations into structured multiple-choice problems, reinforcing the technical and analytical skills tested on the official OBC examination.

100+ Free Cameroon Baccalauréat Série F3 Practice Questions

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