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100+ Free Bac F3 Bénin Practice Questions

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2026 Statistics

Key Facts: Bac F3 Bénin Exam

Coeff 5

Étude de Système Technique, highest-weighted written paper (4 hours)

OBB — Liste des épreuves à l'examen du Baccalauréat

Coeff 4 + Coeff 3

Two compulsory practicals in First Group (Construction T.P. & Mesure T.P., 6-8h each)

OBB — Liste des épreuves à l'examen du Baccalauréat

28 / 560 pts

Total coefficients and points for Série F3 including second-group oral

OBB — Liste des épreuves à l'examen du Baccalauréat

68.38%

Série F3 national admissibility rate, June 2026 session

Office du Baccalauréat du Bénin, results proclamation 8 July 2026

10.00 / 20

Passing weighted average (9.00–9.99 is admissible to the second-group oral)

Décret fixing the Baccalauréat rules, Articles 17–18

Free 100-question English MCQ study adaptation for the Benin Baccalauréat Série F3 (Électrotechnique). The official examination is organized in French by the OBB and comprises written papers in Étude de Système Technique (coeff 5), Électrotechnique (coeff 3), Mathématiques (coeff 3), Sciences Physiques (coeff 2), and Français (coeff 2), two compulsory practicals in Construction T.P. (coeff 4) and Mesure et Essai de Laboratoire T.P. (coeff 3), and a second-group oral (5 coeffs) for candidates averaging 9.00–9.99/20. Pass threshold is a weighted 10.00/20.

Sample Bac F3 Bénin Practice Questions

Try these sample questions to test your Bac F3 Bénin 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 three-phase star (Y) connected electrical power system, what is the fundamental mathematical relationship between line-to-line voltage U and phase-to-neutral voltage V?
A.U = sqrt(3) * V with a phase lead of 30 degrees
B.U = V / sqrt(3) with a phase lag of 30 degrees
C.U = 3 * V with in-phase relationship
D.U = sqrt(2) * V with a phase lead of 45 degrees
Explanation: In a three-phase balanced star configuration, the line-to-line voltage is the vectorial difference between two phase voltages (U12 = V1 - V2). Vector geometry shows that the magnitude is U = sqrt(3) * V and the line voltage leads the corresponding phase voltage by 30 degrees (pi/6 rad). For standard low-voltage networks with V = 230 V, U = 230 * sqrt(3) approx 400 V.
2A balanced three-phase industrial load operates at a line-to-line voltage of U = 400 V, drawing a line current of I = 15 A with a lagging power factor of cos(phi) = 0.80. What is the total active power P consumed by this installation?
A.P = 4.80 kW
B.P = 8.31 kW
C.P = 14.40 kW
D.P = 24.94 kW
Explanation: Total active power in a balanced three-phase system is calculated using P = sqrt(3) * U * I * cos(phi). Substituting the given parameters: P = sqrt(3) * 400 V * 15 A * 0.80 = 1.73205 * 400 * 12 = 8,313.8 W approx 8.31 kW. This accurately reflects three-phase real power consumption.
3An electrical workshop draws an active power of P = 24 kW and a reactive power of Q = 18 kvar from a 400 V three-phase supply. What is the apparent power S and overall power factor cos(phi) of the facility?
A.S = 42.0 kVA and cos(phi) = 0.57
B.S = 21.0 kVA and cos(phi) = 0.85
C.S = 30.0 kVA and cos(phi) = 0.80
D.S = 36.0 kVA and cos(phi) = 0.67
Explanation: Apparent power S is calculated using the power triangle relationship S = sqrt(P^2 + Q^2). Here, S = sqrt(24^2 + 18^2) = sqrt(576 + 324) = sqrt(900) = 30 kVA. The power factor is cos(phi) = P / S = 24 kW / 30 kVA = 0.80. This 3-4-5 proportional triangle is standard in AC load calculations.
4In an unbalanced four-wire three-phase star system with neutral conductor, phase currents are measured as i1(t) = 20*sin(omega*t) A, i2(t) = 20*sin(omega*t - 2*pi/3) A, and i3(t) = 0 A (phase 3 open). What is the RMS magnitude of the current flowing in the neutral conductor I_N?
A.I_N = 0 A
B.I_N = 10.0 A
C.I_N = 28.3 A
D.I_N = 14.14 A
Explanation: By Kirchhoff's current law at the neutral star point, the neutral current vector is I_N = -(I1 + I2 + I3). With I3 = 0, I_N = -(I1 + I2). The RMS value of each active phase is I = 20 / sqrt(2) = 14.14 A. The phasor sum of two equal currents of magnitude I separated by 120 degrees produces a resultant of magnitude equal to I. Therefore, ||I_N|| = 14.14 A.
5Why do electrical utility operators such as SBEE penalize industrial installations operating with a low power factor (e.g., cos phi < 0.90)?
A.Low power factor increases line current for the same active power, causing higher I^2*R transmission losses and voltage drops
B.Low power factor reverses active energy meters and creates negative power generation
C.Low power factor increases the AC supply frequency above standard 50 Hz limits
D.Low power factor causes direct short circuits in distribution step-down transformers
Explanation: Because line current is I = P / (sqrt(3) * U * cos(phi)), a lower power factor requires higher current to deliver the same active useful power P. This elevated current increases Joule losses (P_loss = 3 * R * I^2) across transmission lines, distribution transformers, and cables, while worsening voltage regulation and saturating grid apparent power capacity.
6An industrial facility consumes P = 120 kW with an initial power factor of cos(phi1) = 0.70 (tan(phi1) = 1.02). To avoid utility penalties, the power factor must be raised to cos(phi2) = 0.95 (tan(phi2) = 0.33). What is the required reactive power rating Qc of the shunt capacitor bank?
A.Qc = 42.8 kvar
B.Qc = 82.8 kvar
C.Qc = 120.0 kvar
D.Qc = 162.0 kvar
Explanation: The required reactive power compensation is given by the formula Qc = P * (tan(phi1) - tan(phi2)). Substituting the known values: Qc = 120 kW * (1.02 - 0.33) = 120 * 0.69 = 82.8 kvar. A capacitor bank rated at 82.8 kvar will supply the necessary leading reactive volt-amperes.
7A three-phase capacitor bank providing Qc = 60 kvar is connected to a 400 V, 50 Hz system. How does the required capacitance per element in a delta (Delta) connection C_delta compare to that in a star (Y) connection C_star?
A.C_delta = 3 * C_star, requiring 3 times larger capacitors
B.C_delta = C_star, because total three-phase reactive power is identical
C.C_delta = (1/3) * C_star, requiring 3 times smaller capacitance per capacitor branch
D.C_delta = sqrt(3) * C_star, based on three-phase line-to-phase ratios
Explanation: In delta connection, each capacitor is subjected to full line voltage U (400 V), yielding Qc = 3 * C_delta * omega * U^2. In star connection, each capacitor sees phase voltage V = U / sqrt(3), yielding Qc = 3 * C_star * omega * (U/sqrt(3))^2 = C_star * omega * U^2. Equating the two yields C_delta = C_star / 3. Delta connection is practically preferred because it requires 3 times smaller capacitance values for the same reactive power.
8In the French and international IEC standard for neutral earthing systems (Régimes de neutre), what does the TT system designation specify?
A.Transformer neutral connected to neutral busbar; exposed frames connected to neutral
B.Transformer neutral isolated from earth; exposed frames connected to earth
C.Transformer neutral connected to earth; exposed frames connected to neutral conductor
D.Transformer neutral connected directly to earth; exposed conductive equipment frames connected to an independent earth electrode
Explanation: The first letter 'T' (Terre) denotes that the transformer neutral is directly connected to earth at the distribution substation. The second letter 'T' denotes that all exposed conductive parts (masses) of the user's installation are connected to an independent local earth electrode. This is the standard earthing scheme for low-voltage residential and commercial consumers in public distribution grids.
9In a low-voltage TT earthing network with a phase-to-earth fault occurring on a machine frame, why is the installation of a Residual Current Device (RCD / DDR) mandatory for indirect contact protection?
A.The fault loop resistance (earth electrode resistances R_A + R_B) limits fault current below the instantaneous tripping threshold of standard overcurrent circuit breakers
B.Standard circuit breakers cannot extinguish AC electric arcs at 400 V
C.The TT system does not have a neutral conductor to return load current
D.Capacitive leakage currents in TT networks always reverse the direction of electrical power
Explanation: In a TT system, the fault current loop passes through the local earth electrode (R_A) and the substation earth electrode (R_B), where typical combined resistance is R_loop = 10 to 30 Ohms. The resulting fault current is If = V / R_loop approx 230 / 20 = 11.5 A, which creates a dangerous touch voltage (Uc = R_A * If > 50 V) but is far too low to trip standard 16 A–63 A thermal-magnetic circuit breakers. Therefore, an RCD (DDR) is mandatory to detect small differential residual currents.
10In industrial installations using the TN earthing system, what is the critical regulatory distinction between TN-C and TN-S configurations?
A.TN-C uses separate neutral (N) and protective earth (PE) conductors throughout, while TN-S combines them into a single PEN conductor
B.TN-C combines neutral and protective functions in a single PEN conductor; TN-S separates N and PE into distinct conductors, and once separated, PEN must never be reformed downstream
C.TN-C requires an insulation monitoring device (CPI), whereas TN-S uses only thermal fuses
D.TN-C is restricted to single-phase circuits under 10 A, while TN-S is used exclusively for three-phase motors
Explanation: In TN-C (Terre-Neutre Combiné), the neutral and protective earth are combined in a single conductor (PEN), which requires a minimum cross-section of 10 mm^2 Cu (or 16 mm^2 Al) and must never be switched or broken. In TN-S (Terre-Neutre Séparé), N and PE are separate. Transition from TN-C to TN-S is permitted upstream to downstream, but once separated, the PE and N conductors must never be recombined.

About the Bac F3 Bénin Exam

The Baccalauréat Série F3 (Électrotechnique) is Benin's premier electrical engineering technical secondary school leaving diploma, administered by the Office du Baccalauréat du Bénin (OBB) under the Ministère de l'Enseignement Supérieur et de la Recherche Scientifique (MESRS). Taught at major technical lycées across Benin, such as the Lycée Technique Coulibaly in Cotonou, Lycée Technique de Bohicon, and Lycée Technique de Natitingou, Série F3 prepares technicians and future engineers in industrial electrical installation, electrical machines, power distribution, automated motor control, electrical safety (consignation), and industrial panel fabrication. The official examination is conducted in French and includes written papers, two rigorous 6-to-8-hour practicals (Construction T.P. and Mesure et Essai de Laboratoire T.P.), and a second-group oral in five professional and general disciplines. This practice bank delivers 100 English-language multiple-choice questions with step-by-step technical explanations and calculations to master core electrical engineering concepts.

Assessment

First group, per the OBB coefficient table for Série F3: two compulsory hands-on practicals — Construction T.P. (coeff 4, 6 à 8h) and Mesure et Essai de Laboratoire T.P. (coeff 3, 6 à 8h) — plus written papers in Étude de Système Technique (coeff 5, 4h), Électrotechnique (coeff 3, 4h), Mathématiques (coeff 3, 4h), Sciences Physiques (coeff 2, 3h), and Français (coeff 2, 3h), totaling 22 coefficients (440 points), plus EPS (coeff 1) for 23 coefficients / 460 points. The second-group oral adds 5 coefficients / 100 points: Philosophie (coeff 1), Anglais (coeff 1), Schémas et Technologie (coeff 1), Création et Gestion d'Entreprise (coeff 1), and Législation du travail (coeff 1), open to candidates averaging 9.00 to 9.99/20, bringing the final total to 28 coefficients / 560 points. Admissibility rate for Série F3 in the 2026 session was 68.38%. This practice bank is an English-language MCQ study adaptation; it cannot substitute for the hands-on practicals or the oral examination.

Time Limit

18 hours of written papers plus two compulsory 6-to-8-hour practicals (Construction T.P. and Mesure et Essai de Laboratoire T.P.), sat across the national session

Passing Score

10/20 (Weighted average >= 10.00 / 20; 9.00–9.99 qualifies for the second-group oral)

Exam Fee

5,000 XOF registration for Beninese candidates; 35,000 XOF for foreign candidates; plus 1,000 XOF for the relevé de notes and 2,000 XOF photo-scanning/form-printing for candidats libres (OBB note de service, 20 November 2025) (Office du Baccalauréat du Bénin (OBB) — Ministère de l'Enseignement Supérieur et de la Recherche Scientifique)

Bac F3 Bénin Exam Content Outline

Coeff 5, 4h written (~22% of first-group coefficients)

Étude de Système Technique

Three-phase AC power calculations, power factor correction (capacitor bank sizing), neutral earthing systems (TT, TN, IT fault loops & touch voltages), differential protection (RCD/DDR), protection discrimination, and industrial motor starting schemes (DOL, Star-Delta, soft starter, VFD).

Coeff 4, 6 à 8h practical (~17%)

Construction T.P.

Compulsory hands-on electrical construction workshop: industrial distribution board wiring, component mounting, conductor sizing and color coding, crimping ferrules, contactors (KM), thermal relays, circuit breaker curve selection, industrial fuses, and panel fault troubleshooting.

Coeff 3, 4h written (~13%)

Électrotechnique

Single-phase and three-phase transformers (Kapp diagram, no-load and short-circuit tests, efficiency, voltage regulation), three-phase induction motors (slip, torque-speed characteristics, power balance), synchronous alternators, and DC machines (EMF, torque, speed control).

Coeff 3, 6 à 8h practical (~13%)

Mesure et Essai de Laboratoire T.P.

Compulsory hands-on laboratory testing: active/reactive power measurements (two-wattmeter method), insulation resistance testing (megohmmeter at 500V/1000V DC), earth resistance measurement (tellurometer 3-stake 62% method), clamp meters, electrical safety consignation (5 golden rules), and habilitations (B0, B1, B2, BR, BC).

Coeff 3, 4h written (~13%)

Mathématiques

Complex numbers in AC electrical circuits, trigonometry, differential equations (RC, RL, RLC transient and steady-state responses), integral calculus for instantaneous and RMS values, and probability.

Coeff 2, 3h written (~9%)

Sciences Physiques

Electromagnetism, Ampère's circuital law, Faraday's induction law, Lenz's law, magnetic circuits (Hopkinson's law), self-inductance, and magnetic losses (hysteresis and eddy currents).

Coeff 2, 3h written (~9%)

Français

Technical writing, text analysis, structured synthesis reports, argumentation, and professional communication.

Coeff 1 (~4%)

Éducation Physique et Sportive (EPS)

Practical athletic performance and physical education evaluation.

5 subjects, Coeff 1 each (Total 2 = 5 coeffs / 100 pts)

Second-Group Oral Subjects

Oral examination for admissible candidates (9.00–9.99/20): Philosophie (ethics of technology and energy), Anglais (technical electrical English and datasheets), Schémas et Technologie (single-line/multi-line electrical diagrams and cross-referencing), Création et Gestion d'Entreprise (contracting, quotes, invoicing), and Législation du travail (Beninese labour code and workplace safety liability).

How to Pass the Bac F3 Bénin Exam

What You Need to Know

  • Passing score: 10/20 (Weighted average >= 10.00 / 20; 9.00–9.99 qualifies for the second-group oral)
  • Assessment: First group, per the OBB coefficient table for Série F3: two compulsory hands-on practicals — Construction T.P. (coeff 4, 6 à 8h) and Mesure et Essai de Laboratoire T.P. (coeff 3, 6 à 8h) — plus written papers in Étude de Système Technique (coeff 5, 4h), Électrotechnique (coeff 3, 4h), Mathématiques (coeff 3, 4h), Sciences Physiques (coeff 2, 3h), and Français (coeff 2, 3h), totaling 22 coefficients (440 points), plus EPS (coeff 1) for 23 coefficients / 460 points. The second-group oral adds 5 coefficients / 100 points: Philosophie (coeff 1), Anglais (coeff 1), Schémas et Technologie (coeff 1), Création et Gestion d'Entreprise (coeff 1), and Législation du travail (coeff 1), open to candidates averaging 9.00 to 9.99/20, bringing the final total to 28 coefficients / 560 points. Admissibility rate for Série F3 in the 2026 session was 68.38%. This practice bank is an English-language MCQ study adaptation; it cannot substitute for the hands-on practicals or the oral examination.
  • Time limit: 18 hours of written papers plus two compulsory 6-to-8-hour practicals (Construction T.P. and Mesure et Essai de Laboratoire T.P.), sat across the national session
  • Exam fee: 5,000 XOF registration for Beninese candidates; 35,000 XOF for foreign candidates; plus 1,000 XOF for the relevé de notes and 2,000 XOF photo-scanning/form-printing for candidats libres (OBB note de service, 20 November 2025)

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

Bac F3 Bénin Study Tips from Top Performers

1Master Étude de Système Technique (coeff 5) and Électrotechnique (coeff 3): focus on three-phase power calculations, capacitor sizing for power factor correction (Qc = P*(tan(phi) - tan(phi'))), transformer tests (no-load and short-circuit), and induction motor slip calculations.
2Understand the electrical safety 5-step consignation sequence (Séparation, Condamnation, VAT, MALT/CC, Délimitation/Signalisation) and electrical habilitation levels (B0, B1, B2, BR, BC) thoroughly for the Mesure et Essai T.P.
3Practice two-wattmeter method calculations (P = W1 + W2, Q = sqrt(3)*(W1 - W2)) and earth resistance fall-of-potential (62% rule) measurements for laboratory trials.
4Know industrial component ratings and curve designations for Construction T.P.: contactor utilization categories (AC-3, AC-1), circuit breaker trip curves (B, C, D), and fuse types (gG for general distribution, aM for motor protection).
5Prepare the second-group oral subjects in advance (Schémas et Technologie, Anglais technique, Création et Gestion d'Entreprise, Législation du travail, and Philosophie) in case you qualify in the 9.00–9.99/20 admissibility band.

Frequently Asked Questions

What is the focus of the Baccalauréat Série F3 in Benin?

Série F3 (Électrotechnique) is the national electrical engineering technical diploma in Benin. It covers industrial power distribution, AC/DC electrical machines, transformers, automated motor control panels, electrical metrology, and installation safety according to international and Beninese standards.

Is the official Benin Baccalauréat Série F3 multiple choice?

No. The official examination organized by the Office du Baccalauréat du Bénin (OBB) is administered entirely in French and consists of comprehensive written technical engineering and general science papers, two compulsory 6-to-8-hour workshop practicals (Construction T.P. and Mesure et Essai de Laboratoire T.P.), and an oral examination for second-group candidates. This practice bank is an English-language MCQ study adaptation designed for conceptual reinforcement.

What practical exams are compulsory in Série F3?

Série F3 features two heavy practical examinations in the first group: Construction T.P. (coeff 4, lasting 6 to 8 hours), where candidates assemble and wire industrial control panels and distribution boards, and Mesure et Essai de Laboratoire T.P. (coeff 3, lasting 6 to 8 hours), where candidates perform electrical machine testing, power measurements, insulation testing, and safety consignation.

What is the passing score and grading system for Série F3 in Benin?

The examination is graded on a 0–20 scale with a required weighted average (moyenne générale) of at least 10.00/20 for outright admission (admis). Candidates obtaining an average between 9.00 and 9.99/20 are declared admissible to the second-group oral examination (épreuves orales de contrôle), where they are tested on five subjects (Philosophie, Anglais, Schémas et Technologie, Création et Gestion d'Entreprise, Législation du travail). Below 9.00/20, the candidate is ajourné (failed).

What are the subject coefficients in Série F3?

First group: Étude de Système Technique (coeff 5, 4h), Construction T.P. (coeff 4, 6–8h), Électrotechnique (coeff 3, 4h), Mesure et Essai de Laboratoire T.P. (coeff 3, 6–8h), Mathématiques (coeff 3, 4h), Sciences Physiques (coeff 2, 3h), Français (coeff 2, 3h) — totaling 22 coefficients (440 points), plus EPS (coeff 1) for 23 coefficients / 460 points. Second group oral: 5 subjects with coeff 1 each (Philosophie, Anglais, Schémas et Technologie, Création et Gestion d'Entreprise, Législation du travail) = 5 coefficients / 100 points, resulting in a final grand total of 28 coefficients / 560 points.