100+ Free Cameroon Baccalauréat Série F1 Practice Questions

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2026 Statistics

Key Facts: Cameroon Baccalauréat Série F1 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 8

Weight of the Travaux d'usinage practical

OBC Série F1 timetable, session 2026

The Cameroon Baccalauréat Série F1 is the national technical diploma in mechanical manufacturing administered by OBC, requiring a general average ≥ 10/20 across manufacturing analysis, applied mechanics, machining technology, and general STEM subjects.

Sample Cameroon Baccalauréat Série F1 Practice Questions

Try these sample questions to test your Cameroon Baccalauréat Série F1 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In mechanical manufacturing analysis, what is the primary purpose of the 3-2-1 locating principle (isostatisme) when positioning a prismatic workpiece in a milling fixture?

A.To eliminate all 6 degrees of freedom (3 translations and 3 rotations) using 6 contact points without hyperstatic constraint

B.To clamp the workpiece with maximum hydraulic pressure along three orthogonal axes

C.To ensure that cutting fluids can flow freely around all six exterior faces

D.To allow the workpiece to self-center dynamically during high-speed face milling

Explanation: The 3-2-1 isostatic locating principle uses 6 contact points on mutually perpendicular datum planes (primary datum: 3 points eliminating 1 translation and 2 rotations; secondary datum: 2 points eliminating 1 translation and 1 rotation; tertiary datum: 1 point eliminating 1 translation) to uniquely fix the workpiece's position in space by eliminating all 6 degrees of freedom without redundant over-constraint.

2When locating a long cylindrical workpiece in a turning lathe fixture, which combination of standard locating elements provides a complete isostatic constraint?

A.A long cylindrical locating surface (centrage long eliminating 4 degrees of freedom) and a stop face (butée eliminating 1 translation), plus a rotational stop if orientation is required

B.Three planar points on one end face and two line contacts on the perimeter

C.A short centering pin (centrage court eliminating 2 translations) and two spherical locators

D.Six independent spring-loaded pins distributed evenly along the cylindrical surface

Explanation: For a long cylinder ($L/D > 1.5$), a long cylindrical centering sleeve or chuck jaws act as a 'centrage long' eliminating 4 degrees of freedom (2 translations and 2 rotations perpendicular to the axis). An axial stop (appui ponctuel/butée) eliminates the longitudinal translation, leaving only axial rotation (which is eliminated by an orienting pin if angular timing is needed).

3In a 1D tolerance chain calculation (chaîne de cotes), what is the condition for a functional clearance (jeu $J$) to be at its maximum value ($J_{max}$)?

A.All vector components pointing in the same direction as $J$ are at their maximum, and all components pointing in the opposite direction are at their minimum

B.All vector components in the chain are simultaneously at their maximum permissible values

C.All vector components in the chain are simultaneously at their minimum permissible values

D.The component with the largest nominal tolerance is set to zero while others are at nominal

Explanation: In 1D tolerance chain analysis (méthode des vecteurs-cotes), the condition vector $J$ is expressed as $J = \sum \vec{a}_i^+ - \sum \vec{a}_j^-$. Therefore, $J_{max} = \sum a_{i,max}^+ - \sum a_{j,min}^-$, meaning positive vector components are maximized while negative opposing components are minimized.

4An ISO fit is designated as $\varnothing 40\text{ H7/g6}$. What type of mechanical fit does this represent?

A.A sliding clearance fit (ajustement avec jeu)

B.A heavy interference press fit (ajustement avec serrage)

C.A transition fit with guaranteed zero clearance

D.A shrink-fit requiring thermal expansion

Explanation: The hole tolerance 'H7' has a lower deviation of zero ($EI = 0$). The shaft tolerance 'g6' has an upper deviation that is strictly negative ($es < 0$). Because the maximum shaft diameter is always strictly smaller than the minimum hole diameter, this fit is guaranteed to have positive clearance ($J_{min} > 0$), representing a precision sliding clearance fit.

5In process planning (gamme d'usinage), why are roughing operations (ébauche) systematically grouped into separate early phases prior to finishing operations (finition)?

A.To release internal residual stresses and prevent cutting heat and clamping deformation from spoiling final dimensional and surface accuracy

B.To allow the machine operator to change the spindle motor between operations

C.Because cutting fluids cannot be used during roughing operations

D.To ensure that finishing tools wear out at the exact same rate as roughing inserts

Explanation: Roughing involves high cutting forces and heat generation that cause workpiece elastic deflection, thermal expansion, and stress relief. By separating roughing from finishing, the part cools down, residual stresses stabilize, and lighter finishing cuts with minimal force achieve tight dimensional tolerances and fine surface roughness ($Ra$).

6A milling phase contract (contrat de phase) specifies a manufacturing tolerance dimension $C_f = 50^{\pm 0.1}\text{ mm}$. What is the tolerance interval ($IT$) for this dimension?

A.0.2 mm

B.0.1 mm

C.50.1 mm

D.0.05 mm

Explanation: The upper limit is $C_{max} = 50 + 0.1 = 50.1\text{ mm}$ and the lower limit is $C_{min} = 50 - 0.1 = 49.9\text{ mm}$. The tolerance interval is $IT = C_{max} - C_{min} = 50.1 - 49.9 = 0.2\text{ mm}$.

7In the symbolization of isostatic constraints according to standard AFNOR/ISO norms, what does a solid arrow with a circle and an inscribed number (e.g., circled 1) represent?

A.An isostatic locating point (appui ponctuel / normale de repérage) defining a specific degree of freedom constraint

B.A hydraulic clamping cylinder with variable clamping pressure

C.The direction of the primary cutting speed vector ($V_c$)

D.The position of an automatic touch probe for tool calibration

Explanation: Under the French symbolisation standard NF E 04-013 (Symbolisation des mises en position et maintien en position), a contact point numbered 1 to 6 indicates an isostatic locating constraint (normale de repérage) that removes one degree of freedom along the normal to the contact surface.

8What is the primary technical consequence of an over-constrained fixture setup (système hyperstatique) during part clamping?

A.Workpiece deformation, internal stresses, and unpredictable geometric errors due to redundant contact points fighting each other

B.The workpiece will vibrate uncontrollably because it lacks sufficient contact points

C.The spindle speed of the milling machine will automatically drop by 50%

D.The cutting tool will instantly shatter regardless of the feed rate

Explanation: An over-constrained (hyperstatic) setup has more than 6 rigid locating points or redundant locators on the same surface. When clamping force is applied, the workpiece is forced to deform elastically across the misaligned redundant contact points, resulting in warped geometry once unclamped.

9A turning operation on a cylindrical shaft of diameter $D = 80\text{ mm}$ requires a cutting speed of $V_c = 150\text{ m/min}$. Calculate the required spindle rotational speed $N$ (in rpm).

A.597 rpm

B.1200 rpm

C.1875 rpm

D.188 rpm

Explanation: The cutting speed formula is $V_c = \frac{\pi \cdot D \cdot N}{1000}$. Rearranging for rotational speed: $N = \frac{1000 \cdot V_c}{\pi \cdot D} = \frac{1000 \cdot 150}{3.14159 \cdot 80} = \frac{150000}{251.33} \approx 597\text{ rpm}$.

10A 4-tooth face milling cutter ($z = 4$) with diameter $D = 63\text{ mm}$ operates at $N = 800\text{ rpm}$ with a feed per tooth of $f_z = 0.15\text{ mm/tooth}$. What is the table feed speed $V_f$ in mm/min?

A.480 mm/min

B.120 mm/min

C.240 mm/min

D.960 mm/min

Explanation: Table feed speed is given by $V_f = f_z \cdot z \cdot N$. Substituting the given values: $V_f = 0.15\text{ mm/tooth} \times 4\text{ teeth} \times 800\text{ rpm} = 0.60 \times 800 = 480\text{ mm/min}$.

About the Cameroon Baccalauréat Série F1 Exam

The Cameroon Baccalauréat Technique Série F1 (Fabrication Mécanique) is the national technical secondary school leaving diploma for students specializing in mechanical manufacturing, machining technology, and industrial production. Administered by the Office du Baccalauréat du Cameroun (OBC) under the Ministry of Secondary Education (MINESEC), Série F1 combines advanced mechanical theory (manufacturing analysis, statics, dynamics, strength of materials, and automation) with hands-on machining and fabrication proficiency. This 100-question practice bank provides comprehensive coverage of the official syllabus with detailed technical explanations. Format note: the official examination is written and practical in French; this bank is an English-language MCQ study adaptation designed to build conceptual mastery and calculation problem-solving skills.

Assessment

The national examination is sat in two phases: compulsory written papers, then a compulsory workshop practical for candidates declared admissible. Per the OBC session 2026 timetable for Série F1, the written papers are Construction Mécanique — Étude ou Projet (6h, coef 5), Analyse de Fabrication (4h, coef 4), Étude d'Outillage ou Planning (5h, coef 3), Commande Numérique (3h, coef 3), Mécanique Appliquée (3h, coef 2), Automatisme (2h, coef 2), Mathématiques (3h, coef 3), Sciences Physiques (3h, coef 3), 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) and Histoire ou Géographie (2h, coef 1). The compulsory practical is Travaux pratiques — Travaux d'usinage (8h, coef 8). Optional papers may be taken on a separate day.

Time Limit

Written papers spread over five days (21, 22, 25, 26 and 28 May in the 2026 session), ranging from 1h30 to 6h each, followed by an 8-hour machining practical

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 F1 Exam Content Outline

25%

Analyse de Fabrication & Gammes d'Usinage

Process planning, machining phase analysis, isostatic datum positioning (isostatisme 3-2-1), dimension transfer and chain calculation, ISO fits and geometrical tolerancing, and production routing sheets.

25%

Mécanique Appliquée & Résistance des Matériaux

Statics of rigid bodies, coplanar and spatial force resolution, moments and couples, friction and clutches, kinematics of mechanism linkages, stress-strain analysis, tension-compression, shear, torsion, and beam bending.

20%

Procédés d'Usinage, Outils de Coupe & Métrologie

Lathe turning, milling, drilling, grinding, cutting parameters (Vc, f, ap), tool angles and wear mechanisms, cutting power calculation, dimensional metrology, vernier calipers, micrometers, and dial gauges.

15%

Automatisme Industriel & Dessin Industriel

Pneumatic and electro-pneumatic circuits, directional control valves, GRAFCET sequential charts (levels 1 and 2), PLC logic, Boolean equations, mechanical assembly drawings, kinematic diagrams, and CAD conventions.

15%

Mathématiques Générales & Sciences Physiques Appliquées

Differential and integral calculus, trigonometry, vector geometry, applied thermodynamics, metallurgy of ferrous/non-ferrous alloys, phase diagrams, heat treatments (quenching, tempering, annealing), and material properties.

How to Pass the Cameroon Baccalauréat Série F1 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 a compulsory workshop practical for candidates declared admissible. Per the OBC session 2026 timetable for Série F1, the written papers are Construction Mécanique — Étude ou Projet (6h, coef 5), Analyse de Fabrication (4h, coef 4), Étude d'Outillage ou Planning (5h, coef 3), Commande Numérique (3h, coef 3), Mécanique Appliquée (3h, coef 2), Automatisme (2h, coef 2), Mathématiques (3h, coef 3), Sciences Physiques (3h, coef 3), 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) and Histoire ou Géographie (2h, coef 1). The compulsory practical is Travaux pratiques — Travaux d'usinage (8h, coef 8). Optional papers may be taken on a separate day.
Time limit: Written papers spread over five days (21, 22, 25, 26 and 28 May in the 2026 session), ranging from 1h30 to 6h each, followed by an 8-hour machining practical
Exam fee: 21,000 FCFA

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Frequently Asked Questions

What is the Cameroon Baccalauréat Série F1?

The Baccalauréat Série F1 is the official Cameroonian technical high school leaving credential specializing in Fabrication Mécanique (Mechanical Manufacturing and Machining). Administered nationally by the Office du Baccalauréat du Cameroun (OBC), it qualifies graduates for higher technical education (ENSET, IUT, ENSPY) and industrial technical roles.

What subjects carry the highest weighting in Baccalauréat F1?

On the OBC session 2026 timetable the heaviest single component is the compulsory machining practical, Travaux d'usinage (coefficient 8). Among the written papers, Construction Mécanique — Étude ou Projet carries coefficient 5 and Analyse de Fabrication coefficient 4, followed by Étude d'Outillage ou Planning, Commande Numérique, Mathématiques and Sciences Physiques at coefficient 3 each.

What is the passing requirement for the Baccalauréat F1?

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 F1?

This practice bank adapts the core mathematical formulas, cutting parameter calculations, RDM stress-strain equations, datum positioning rules (isostatisme), and GRAFCET sequential logic into clear, structured multiple-choice problems, reinforcing the essential engineering concepts tested in the official OBC examination.

100+ Free Cameroon Baccalauréat Série F1 Practice Questions

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