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Key Facts: Bac F1 Niger Exam

OBEECS

The national authority administering all general and technical Baccalauréat series in Niger

Office du Baccalauréat du Niger (obeecsniger.com)

3-2-1 Principle

Standard isostatic positioning rule for prismatic workpieces in manufacturing analysis

Niger Bac F1 Analyse de fabrication syllabus

3–6 hours

Duration range of the official F1 technical papers reviewed

OBEECS official past papers

Free independent practice for Niger's Baccalauréat Série F1 (Construction Mécanique): English-language MCQs covering mechanical design, limits and fits, gear transmissions, manufacturing analysis (gammes d'usinage), machining parameters, strength of materials (RDM), and materials science.

Sample Bac F1 Niger Practice Questions

Try these sample questions to review concepts for the Bac F1 Niger exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In an ISO fit designation of 40H7/g6, what does the uppercase letter 'H' indicate?

A.It is a shaft tolerance zone whose fundamental deviation guarantees an interference fit with any standard hole

B.It sets the tolerance grade of the hole, so the letter 'H' on its own fixes the width of the tolerance band

C.It is a hole tolerance zone whose lower deviation EI is zero, so the smallest permitted hole equals the nominal size

D.It marks the fit as a transition fit in which the shaft and the hole share the same upper deviation value

Explanation: In the ISO system of limits and fits, uppercase letters designate hole tolerance zones and lowercase letters designate shaft zones. An uppercase 'H' designates the basic hole system where the lower deviation EI (Écart Inférieur) is exactly 0. This means the minimum hole limit is equal to the basic nominal size (40.000 mm).

2For a hole of 50H7 with fundamental deviation EI = 0 and tolerance IT7 = +25 µm, mated with a shaft of 50g6 with upper deviation es = −9 µm and tolerance IT6 = 16 µm, what is the maximum clearance (Jeu maximal)?

A.50 µm

B.16 µm

C.25 µm

D.9 µm

Explanation: Maximum clearance is calculated as Max Clearance = D_max (hole) - d_min (shaft). For 50H7, D_max = 50.025 mm. For 50g6, the lower deviation ei = es - IT6 = -9 - 16 = -25 µm, so d_min = 50.000 - 0.025 = 49.975 mm. Therefore, Max Clearance = 50.025 - 49.975 = +0.050 mm = 50 µm (or EI + IT7 - ei = 0 + 25 - (-25) = 50 µm).

3Which kinematic pair permits exactly one degree of freedom consisting purely of translation along a single axis?

A.Helical joint (Liaison hélicoïdale)

B.Cylindrical joint (Liaison pivot-glissant)

C.Revolute joint (Liaison pivot)

D.Prismatic joint (Liaison glissière)

Explanation: A prismatic joint (liaison glissière) eliminates 5 degrees of freedom (all three rotations and two translations), allowing only a single translational motion along its guide axis.

4In a standard gear train, a driving pinion with 20 teeth meshes directly with a driven gear with 60 teeth. If the driving pinion rotates at 1,500 rpm, what is the rotational speed of the driven gear?

A.4,500 rpm

B.500 rpm

C.300 rpm

D.750 rpm

Explanation: The gear transmission ratio is given by r = N_driven / N_driving = Z_driving / Z_driven = 20 / 60 = 1/3. Therefore, the driven speed is N_driven = 1,500 * (1/3) = 500 rpm.

5What is the primary technical function of deep-groove ball bearings (roulements à billes à gorge profonde) in a mechanical transmission?

A.Supporting heavy unidirectional axial loads with zero radial capacity

B.Carrying mainly radial loads plus moderate axial loads in both directions

C.Accommodating large angular shaft misalignments exceeding 10 degrees

D.Allowing free axial sliding of the shaft while still resisting the transmitted torque

Explanation: Single-row deep-groove ball bearings are the most versatile bearing type, primarily designed to carry radial loads while their deep raceway grooves also permit moderate axial loads in both directions.

6Two tapered roller bearings support a rotating shaft in an O arrangement (montage indirect, 'en O'). What distinguishes it from the X arrangement (montage direct)?

A.The pressure-cone apexes lie between the two bearings, which shortens the effective spread

B.Both bearings face the same way, so the pair carries axial load in one direction only

C.The pair needs no axial clearance or preload adjustment once it has been assembled

D.The pressure-cone apexes lie outside the bearing pair, which widens the effective spread

Explanation: In the O (back-to-back) arrangement the load lines diverge towards the shaft axis, so the apexes of the pressure cones fall outside the bearing pair. The distance between the effective pressure centres is therefore larger than the bearing spacing, which gives the shaft better resistance to tilting moments; in the X arrangement the apexes fall between the bearings.

7What is the pitch diameter (diamètre primitif) d of a standard spur gear with module m = 2.5 mm and tooth number Z = 36?

A.90 mm

B.83.75 mm

C.72 mm

D.95 mm

Explanation: The pitch diameter of a standard involute spur gear is calculated using the fundamental relation d = m * Z. With m = 2.5 mm and Z = 36, d = 2.5 * 36 = 90 mm.

8Which machine element transmits torque between a shaft and a hub while strictly preventing rotational slippage, fitted into matching parallel grooves?

A.Retaining ring / circlip (Anneau élastique)

B.Dynamic lip seal (Joint à lèvre)

C.Parallel key (Clavette parallèle)

D.Thrust washer (Rondelle de butée)

Explanation: A parallel key (clavette parallèle) is inserted into a shaft keyway and hub keyway to transmit torque by shear and compressive contact against the side flanks of the key.

9In technical drawing, what does a section lining (hachures) crossing different adjacent parts signify?

A.All adjacent parts must share identical section lines to indicate that they belong to the same mechanism

B.Section lines must always be drawn horizontally regardless of the part boundaries

C.Standard parts like bolts and shafts must be fully hatched when sliced longitudinally

D.Adjacent parts must have section lines drawn with different angles or spacing to distinguish boundaries

Explanation: In ISO technical drawing standards, when two or more distinct parts are adjacent in an assembly section view, their section lines (hachures) must differ in direction (e.g. 45° vs 135°) or in line pitch/spacing so that individual component profiles are immediately distinguishable.

10In a belt drive with two pulleys of diameters d1 = 120 mm and d2 = 360 mm, what is the speed ratio (rapport de transmission)?

A.1/3 (0.333)

B.2/3 (0.667)

C.3.0

D.1/2 (0.500)

Explanation: Assuming negligible belt slip, the peripheral speed is equal on both pulleys: v = pi * d1 * N1 = pi * d2 * N2. The speed ratio r = N2 / N1 = d1 / d2 = 120 / 360 = 1/3 ≈ 0.333.

About the Bac F1 Niger Exam

Série F1 is Niger's technical secondary baccalauréat in mechanical construction and manufacturing, administered by OBEECS. This independent bank provides conceptual English-language MCQ practice in mechanical design, process planning, machining, applied mechanics, and materials. It is not an official translation or paper simulation and does not replace workshop or technical-drawing practice.

Exam sponsor: Office du Baccalauréat, des Équivalences et des Examens et Concours du Supérieur (OBEECS). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

OBEECS's official paper bank lists first-group papers in Analyse de fabrication, Étude ou Projet, Mécanique appliquée, Mathématiques, Français, Anglais, and Arabe. The second group lists Atelier, Étude d'outillage, Mécanique, Technologie, Sciences physiques, and Mathématiques. The technical papers reviewed are in French.

Time Limit

Official papers reviewed: Mécanique appliquée 3 hours; Analyse de fabrication 4 hours; Étude ou Projet 6 hours

Passing Score

Not published in the current OBEECS public materials reviewed; the papers carry subject coefficients.

Exam / Certification Fees

Latest official schedule located (4 April 2024): 2,500 FCFA public-school official; 10,000 FCFA private-school official or independent; 25,000 FCFA foreign candidate. No separate 2026 fee notice was found.

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

26% of this local bank (26 questions)

Mechanical Construction

Assembly drawings, kinematic pairs, ISO fits (H7/g6, H7/p6), gear trains, belt drives, rolling bearing selection and mounting, keys, and dynamic seals

27% of this local bank (27 questions)

Manufacturing Analysis and Machining

Process planning, datum selection, isostatic clamping (3-2-1), cutting parameters (cutting speed, spindle speed, feed rate), turning, milling, tool wear, and metrology

32% of this local bank (32 questions)

Applied Mechanics and Strength of Materials

Statics of mechanical systems, friction, tension, compression, shear, simple bending, torsion, and allowable stress calculations

15% of this local bank (15 questions)

Materials Science and Engineering Physics

Steel and cast iron designations, heat treatment cycles (quenching, tempering), non-ferrous alloys, mechanical work, power, and torque relationships

Preparing for the Bac F1 Niger Exam

What You Need to Know

Passing score: Not published in the current OBEECS public materials reviewed; the papers carry subject coefficients.
Assessment: OBEECS's official paper bank lists first-group papers in Analyse de fabrication, Étude ou Projet, Mécanique appliquée, Mathématiques, Français, Anglais, and Arabe. The second group lists Atelier, Étude d'outillage, Mécanique, Technologie, Sciences physiques, and Mathématiques. The technical papers reviewed are in French.
Time limit: Official papers reviewed: Mécanique appliquée 3 hours; Analyse de fabrication 4 hours; Étude ou Projet 6 hours
Exam / certification fees: Latest official schedule located (4 April 2024): 2,500 FCFA public-school official; 10,000 FCFA private-school official or independent; 25,000 FCFA foreign candidate. No separate 2026 fee notice was found. Official sources

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Bac F1 Niger: Suggested Study Strategy

1Master ISO tolerance notation (hole basis system, clearance vs interference fits like H7/g6 and H7/p6) and calculate maximum/minimum clearances.

2Practise process planning calculations: converting cutting speed Vc in m/min to spindle speed N in rpm using N = (1000 * Vc) / (pi * d).

3Revise the 3-2-1 isostatic location principle for prismatic and cylindrical workpieces.

4Review beam bending formulas: maximum bending moment for simply supported beams with point loads and uniformly distributed loads, and normal stress sigma = M * y / I.

5Work through official-style manufacturing plans and mechanism studies, including phase contracts, functional dimensions, bearings, fits, statics, kinematics, and strength-of-materials calculations.

Frequently Asked Questions

Is the Niger Bac F1 a multiple-choice examination?

No. The official Série F1 materials reviewed use written technical problems, drawing analyses, and a second-group Atelier paper in French. This bank is an independent English-language MCQ study adaptation, not an official translation or format simulation.

What core subjects carry the highest weight in Série F1?

The core technical subjects are Construction mécanique (design, drawing, and mechanisms), Analyse de fabrication (manufacturing process planning), and Mécanique appliquée (statics, dynamics, and strength of materials), complemented by Mathematics and Physical Sciences.

What appears in the official second-group F1 papers?

The OBEECS paper bank lists Atelier, Étude d'outillage, Mécanique, Technologie, Sciences physiques, and Mathématiques for the second group. The published materials reviewed do not state the threshold for entering that group.

Free Practice Questions for Bac F1 Niger

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