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Key Facts: Bac Pro TCI Exam

Niveau 4

French national vocational qualification level (EQF Level 4 / Baccalaureate level)

France Compétences (RNCP38337)

10.0 / 20

Minimum overall weighted average grade required to obtain the diploma

Ministère de l'Éducation nationale (Arrêté du 26 février 2018)

0 €

Registration fee for public examination entry on the Cyclades portal

Portail National Cyclades France

Coef 12

Weighting of the E3 workplace-linked practical block (fabrication, on-site rehabilitation, economy-management, PSE)

Règlement d'examen Bac Pro TCI (Arrêté du 9 juillet 2018)

100 MCQs

Comprehensive high-yield practice questions authored in this OpenExamPrep bank

OpenExamPrep Practice Curriculum

The Bac Pro TCI (RNCP38337) is France's national Level 4 vocational diploma certifying industrial boilermakers, sheet-metal technicians, and pipe fabricators. Assessment is performance-based across 29 coefficient points: a 3-hour practical technical unit (E2, coef 5), the coefficient-12 workplace-linked practical block E3, and general-education units, requiring an overall weighted average of at least 10.0/20. Public registration is free (0 €) on Cyclades. This 100-question practice test covers technical drawing developments, CNC press brake forming, TIG/MIG welding, CODAP pressure vessel standards, and workshop safety.

Sample Bac Pro TCI Practice Questions

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

1In sheet metal fabrication, what is the 'neutral fiber' (fibre neutre) and where is it located across the sheet thickness during air bending?

A.The theoretical layer within the sheet thickness that undergoes zero longitudinal strain (neither tension nor compression) during bending, located between 0.33×e and 0.5×e from the inside face

B.The outermost surface of the bend that experiences maximum plastic elongation and thinning

C.The innermost surface of the bend that experiences maximum compressive upsetting and wrinkling

D.The exact geometric centerline at 0.5×e for all sheet materials and bending radii regardless of forming method

Explanation: During bending, the outer fibers of the sheet are in tension and undergo elongation, while the inner fibers are in compression and undergo shortening. The neutral fiber (fibre neutre) is the transition layer where normal stress and longitudinal strain equal zero. Because metal has less resistance to compression than tension during tight bending, plastic flow shifts the neutral fiber inward toward the inside bend radius, typically placing it at a distance of 0.33×e to 0.45×e from the inner surface (represented by the K-factor).

2A boilermaker needs to determine the developed flat length (longueur développée) of an L-profile with outside leg dimensions A = 120 mm and B = 80 mm, sheet thickness e = 4 mm, inside bend radius R_i = 4 mm, and a known bend deduction (perte au pli) ΔL = 7.2 mm for a 90° bend. What is the correct flat pattern blank length?

A.192.8 mm

B.200.0 mm

C.185.6 mm

D.207.2 mm

Explanation: Using the standard French bend deduction method (méthode de la perte au pli), the developed blank length L is calculated directly from the outer leg dimensions minus the bend deduction: L = A + B - ΔL. Substituting the given values: L = 120 mm + 80 mm - 7.2 mm = 192.8 mm. This accounts for the material stretch that occurs in the bend zone.

3When laying out the flat pattern development of a right circular concentric cone with base diameter D = 400 mm and slant height (génératrice) G = 800 mm, what is the included angle (angle de développement, α) of the developed circular sector?

A.90°

B.180°

C.120°

D.240°

Explanation: The development of a right circular cone is a sector of a circle whose radius equals the slant height G and whose arc length equals the base circumference (π × D). The developed sector angle is therefore α = 360° × R_base / G = 360° × D / (2 × G). Substituting the given dimensions: R_base = 400 / 2 = 200 mm, so α = 360° × (200 / 800) = 360° × 0.25 = 90°. Check: the arc of a 90° sector of radius 800 mm measures (90 / 360) × 2π × 800 ≈ 1,257 mm, which is exactly π × 400 mm, the circumference of the cone base.

4In descriptive geometry applied to boilermaking tracés, how is the true length (vraie grandeur, VG) of an oblique line segment determined using the right-angle triangle method (méthode du triangle rectangle)?

A.By multiplying the apparent length in the elevation view by the square root of 2

B.By projecting the segment onto an auxiliary plane oriented parallel to the coordinate axis

C.By measuring the direct straight-line distance between the points in the isometric view

D.By constructing a right-angle triangle where the two perpendicular legs are the horizontal projection length (plan view) and the difference in vertical heights (elevation ΔZ); the hypotenuse is the true length

Explanation: The right-angle triangle method (méthode du triangle rectangle) is fundamental in descriptive boilermaking layout. An oblique segment's apparent length in the horizontal plan view represents one leg (adjacent side), while the vertical elevation difference between its two endpoints (ΔZ = Z_top - Z_bottom) represents the perpendicular leg. According to the Pythagorean theorem, the hypotenuse of this triangle equals the true spatial length (vraie grandeur): VG = √(horizontal_projection² + ΔZ²).

5Which development technique is strictly required when laying out the sheet metal pattern for a 90° straight tee intersection between two equal-diameter cylinders (piquage droit à axes concourants de même diamètre)?

A.Radial line development (méthode des génératrices rayonnantes)

B.Triangulation method (méthode par triangulation)

C.Spherical zone projection method

D.Parallel line development (méthode des génératrices parallèles)

Explanation: Cylindrical forms have parallel generatrices that are equidistant along the perimeter. Therefore, parallel line development (méthode des génératrices parallèles) is used: the circular cross-section is divided into equal angular divisions (typically 12, 16, or 24 parts), generatrices are projected to the intersection line, and these lengths are transferred onto a flat baseline whose length equals the cylinder circumference (π × D_m).

6When developing an oblique or eccentric truncated cone (cône oblique à bases circulaires parallèles), why must each individual generatrix have its true length calculated independently?

A.Because the metal thickness varies asymmetrically during rolling

B.Because the top and bottom circular bases become elliptical after cutting

C.Because eccentric cones can only be rolled on hydraulic press brakes rather than pyramid plate rolls

D.Because the apex does not lie directly above the center of the base, causing the distance from the apex to each point on the circular base perimeter to vary continuously around the circumference

Explanation: In an eccentric cone, the vertical axis through the apex is shifted off-center relative to the base circle. As a result, the generatrices have differing spatial inclinations and varying lengths: the shortest generatrix is on the side closest to the axis shift, and the longest is on the opposite side. To lay out the flat pattern, the true length (vraie grandeur) of every generatrix (1 to 12 or 24) must be found individually using the right-angle triangle method before drawing the development curve.

7In the flat pattern development of a square-to-round transition hopper (trémie de passage carré à rond), the transition surface between each flat triangular side and the top circular collar is formed by:

A.Four conical sector corners (quartiers coniques) developed by triangulation from each square corner

B.Four cylindrical segments developed by parallel generatrices

C.Planar trapezoids connected by sharp 90° bends

D.Spherical dished segments formed exclusively by deep stamping

Explanation: A square-to-round hopper consists of four flat planar triangles (one resting on each side of the square base) and four corner transition zones. Each corner transition is a quarter of an oblique cone whose apex is the corner of the square base and whose base is a quarter of the top circular opening. These four conical quarters are laid out using the triangulation method by dividing each quarter-circle into divisions and finding true lengths.

8When developing a 45° angled cylindrical branch pipe into a main header pipe (piquage oblique à 45°), the penetration hole cutout on the main header pipe (découpe de la gueule de loup sur le collecteur) exhibits which geometric shape on the flat developed sheet?

A.A perfect geometric circle whose diameter equals the branch pipe outer diameter

B.A regular rhombus with 45° and 135° sharp corners

C.A sine wave having constant amplitude across the entire plate width

D.A symmetrical oval-like curve (courbe quasi-elliptique symétrique) whose transverse width matches the branch diameter and whose longitudinal length is expanded along the pipe axis

Explanation: When a branch enters a cylindrical header at an oblique angle (45°), the intersection line in 3D space curves around the cylinder wall. When unwrapped onto the flat plate of the header, the cutout forms an elongated, smooth symmetrical curve resembling an ellipse. The width across the circumference equals the projected branch chord, while the axial length is stretched due to the 1/sin(45°) inclination.

9Under standard NF EN ISO 2553 for the symbolic representation of welded joints on engineering blueprints, what does a dashed identification line (ligne d'identification discontinue) drawn parallel to the continuous reference line signify?

A.The weld is temporary (pointage) and must be ground flush before final inspection

B.The joint requires 100% volumetric non-destructive radiographic testing

C.Symbols placed on the dashed identification line designate welds located on the 'other side' (côté opposé) of the joint from where the arrow points

D.The weld must be executed using an automated or robotic welding process

Explanation: In NF EN ISO 2553 (System A, standard in Europe and France), the dual reference line consists of a continuous line and a dashed identification line. Elementary weld symbols placed on the continuous line apply to the 'arrow side' (côté flèche) of the joint. Elementary weld symbols placed on the dashed line apply to the 'other side' (côté opposé). This provides unambiguous distinction on blueprints.

10On an engineering drawing following ISO 2553, a fillet weld (soudure d'angle) is annotated with 'a6'. What does this dimension represent?

A.A nominal design throat thickness (gorge nominale) of 6 mm, measured as the height of the largest inscribed right triangle

B.A leg length (côte du triangle, z) of 6 mm along each plate surface

C.A root gap of 6 mm between the two assembled plates prior to welding

D.An automated welding pass number of 6

Explanation: In ISO 2553, fillet welds are dimensioned by either the design throat thickness preceded by the letter 'a' (gorge nominale) or the leg length preceded by the letter 'z'. An annotation of 'a6' means the nominal throat thickness is 6 mm. The relationship for an equal-leg right-angle fillet weld is z = a × √2 ≈ 1.414 × a; thus an 'a6' weld has a leg length z of approximately 8.5 mm.

About the Bac Pro TCI Exam

The Baccalauréat Professionnel Technicien en Chaudronnerie Industrielle (Bac Pro TCI) is France's premier state-certified Level 4 secondary vocational diploma (EQF Level 4) awarded by the Ministère de l'Éducation nationale et de la Jeunesse. Regulated under the Arrêté du 26 février 2018 and registered in the RNCP under fiche RNCP38337, this qualification certifies boilermakers, sheet metal fabricators, and pipefitters capable of independently fabricating complex boilermaking structures, pressure vessels (appareils à pression), industrial piping (tuyauterie industrielle), and metal frameworks. Technicians analyze CAD models, calculate developed sheet lengths and bend allowances, program CNC cutting and press brake bending machinery, execute certified welds under ISO 9606-1 and EN ISO 15614 standards, perform non-destructive testing (visual, penetrant, radiographic, and hydrostatic tests compliant with CODAP / EN 13445), and lead fabrication teams while enforcing strict workshop safety standards (CATEC, lifting regulations, and fume extraction). Public examination registration is free (0 €) via the Cyclades portal.

Exam sponsor: Ministère de l'Éducation nationale et de la Jeunesse (MEN). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

The Baccalauréat Professionnel Technicien en Chaudronnerie Industrielle (RNCP38337, Level 4 EQF) was created by the Arrêté du 26 février 2018; its règlement d'examen (annexe II b) was replaced by the Arrêté du 9 juillet 2018 and is the version in force. The obligatory units total coefficient 29: E1 Épreuve scientifique et technique, coef 3 (sous-épreuve E11 Mathématiques, coef 1.5, U11; sous-épreuve E12 Sciences physiques et chimiques, coef 1.5, U12 — each 1 h practical-and-written in the ponctuel path); E2 Analyse et exploitation de données techniques, coef 5, single unit U2, ponctuel pratique 3 h; E3 Épreuve pratique prenant en compte la formation en milieu professionnel, coef 12 (sous-épreuve E31 Fabrication d'un ensemble chaudronné, coef 6, U31, ponctuel oral 30 min and 45 min; sous-épreuve E32 Réhabilitation sur chantier d'un ensemble chaudronné, coef 4, U32, ponctuel pratique 4 h; sous-épreuve E33 Économie-gestion, coef 1, écrit 2 h; sous-épreuve E34 Prévention-santé-environnement, coef 1, écrit 2 h); E4 Langue vivante, coef 2, oral 20 min; E5 Français, histoire et géographie et enseignement moral et civique, coef 5 (E51 Français, coef 2.5, écrit 2 h 30; E52 Histoire-géographie-EMC, coef 2.5, écrit 2 h); E6 Arts appliqués et éducation artistique, coef 1, écrit 1 h 30; and E7 Éducation physique et sportive, coef 1. School and apprentice candidates take most units by contrôle en cours de formation (CCF) rather than in the ponctuel form. Up to two optional units may be added, and for school and apprentice candidates the chef-d'œuvre score is applied as points above or below 10/20 weighted by 2 without changing any unit coefficient. The diploma is awarded on an overall weighted average of at least 10.0 out of 20.

Time Limit

Ponctuel path: E2 practical 3 h; E32 on-site practical 4 h; E31 oral 30 min and 45 min; E33 and E34 written 2 h each; E11 and E12 1 h each; E4 oral 20 min; E51 written 2 h 30; E52 written 2 h; E6 written 1 h 30. Most school and apprentice candidates sit these units as contrôle en cours de formation instead.

Passing Score

Minimum 10.0/20 overall weighted average

Exam / Certification Fees

0 € (Free public registration via Cyclades portal)

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.

20%

Technical Drawing, Tracés & Developments

Exploiting technical blueprints, isometrics, and welding symbols (ISO 2553); radial and parallel line development of cones, intersecting cylinders (piquages), hoppers (trémies), neutral fiber position, bend deductions, and K-factor calculations.

20%

Sheet Metal Forming & CNC Cutting

Guillotine shearing mechanics and blade clearances; press brake bending (largeur de vé, air bending vs bottoming, tonnage, springback compensation); plate rolling (rouleuse 3 ou 4 rouleaux, croquage des rives); CNC oxy-fuel, plasma, laser, and waterjet cutting; nesting optimization.

20%

Welding & Assembly Processes

Arc welding processes (111 MMA, 135/136 MAG, 141 TIG, 121 SAW); edge preparations (ISO 9692-1); welding procedure specifications and qualifications (DMOS, QMOS according to NF EN ISO 15614-1); welder qualification (ISO 9606-1); weld defects (ISO 6520-1) and ISO 5817 quality levels; bolted flange connections.

20%

Quality Control & Pressure Vessels (CODAP / EN 13445)

European Pressure Equipment Directive (DESP 2014/68/EU) and CODAP/EN 13445 rules; thin-walled cylinder stress calculations; hydrostatic proof testing (épreuve hydraulique); non-destructive testing (VT, PT ressuage, MT magnétoscopie, RT radiographie, UT ultrasons); dimensional inspection and distortion control.

20%

Workshop Safety & Worksite Erection

Welding fume extraction (VLEP, captage à la source); confined space safety (CATEC, atmospheric testing); fire prevention and hot work permits (permis de feu); lifting, slinging, and rigging calculations (CMU, angle factor); work at height (PEMP, scaffolding, safety harness); noise limits and manual handling.

Preparing for the Bac Pro TCI Exam

What You Need to Know

Passing score: Minimum 10.0/20 overall weighted average
Assessment: The Baccalauréat Professionnel Technicien en Chaudronnerie Industrielle (RNCP38337, Level 4 EQF) was created by the Arrêté du 26 février 2018; its règlement d'examen (annexe II b) was replaced by the Arrêté du 9 juillet 2018 and is the version in force. The obligatory units total coefficient 29: E1 Épreuve scientifique et technique, coef 3 (sous-épreuve E11 Mathématiques, coef 1.5, U11; sous-épreuve E12 Sciences physiques et chimiques, coef 1.5, U12 — each 1 h practical-and-written in the ponctuel path); E2 Analyse et exploitation de données techniques, coef 5, single unit U2, ponctuel pratique 3 h; E3 Épreuve pratique prenant en compte la formation en milieu professionnel, coef 12 (sous-épreuve E31 Fabrication d'un ensemble chaudronné, coef 6, U31, ponctuel oral 30 min and 45 min; sous-épreuve E32 Réhabilitation sur chantier d'un ensemble chaudronné, coef 4, U32, ponctuel pratique 4 h; sous-épreuve E33 Économie-gestion, coef 1, écrit 2 h; sous-épreuve E34 Prévention-santé-environnement, coef 1, écrit 2 h); E4 Langue vivante, coef 2, oral 20 min; E5 Français, histoire et géographie et enseignement moral et civique, coef 5 (E51 Français, coef 2.5, écrit 2 h 30; E52 Histoire-géographie-EMC, coef 2.5, écrit 2 h); E6 Arts appliqués et éducation artistique, coef 1, écrit 1 h 30; and E7 Éducation physique et sportive, coef 1. School and apprentice candidates take most units by contrôle en cours de formation (CCF) rather than in the ponctuel form. Up to two optional units may be added, and for school and apprentice candidates the chef-d'œuvre score is applied as points above or below 10/20 weighted by 2 without changing any unit coefficient. The diploma is awarded on an overall weighted average of at least 10.0 out of 20.
Time limit: Ponctuel path: E2 practical 3 h; E32 on-site practical 4 h; E31 oral 30 min and 45 min; E33 and E34 written 2 h each; E11 and E12 1 h each; E4 oral 20 min; E51 written 2 h 30; E52 written 2 h; E6 written 1 h 30. Most school and apprentice candidates sit these units as contrôle en cours de formation instead.
Exam / certification fees: 0 € (Free public registration via Cyclades portal) Official sources

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Bac Pro TCI: Suggested Study Strategy

1Master sheet metal development geometry: practice calculating bend deductions (perte au pli) and developed lengths using the neutral fiber (fibre neutre) and K-factor for various bending angles (45°, 90°, 135°).

2Memorize press brake V-die opening rules: typically V = 6 to 8 × thickness for sheet metal up to 3 mm, and V = 10 to 12 × thickness for heavier plates, ensuring inner radius r_i ≈ V / 6 in air bending.

3Know welding process designations under ISO 4063: 111 (MMA / SMAW), 135 (MAG with solid wire), 136 (MAG with flux-cored wire), 141 (TIG / GTAW), and 121 (SAW submerged arc).

4Understand pressure vessel stress and hydrostatic testing: apply thin-wall hoop stress formulas and know that CODAP / EN 13445 specifies test pressure as 1.43 × PS (maximum allowable pressure) for standard vessels.

5Review workshop and site safety rules: strict compliance with hot work permits (permis de feu), CATEC confined space atmospheric monitoring (oxygen between 19.5% and 23.5%), and sling angle loading factors.

Frequently Asked Questions

What is the Bac Pro TCI and what careers does it certify?

The Baccalauréat Professionnel Technicien en Chaudronnerie Industrielle (Bac Pro TCI, RNCP38337) is a national Level 4 secondary vocational qualification awarded by the French Ministry of National Education. It certifies skilled technicians who prepare, cut, form, assemble, weld, and inspect metallic equipment across heavy industries: oil and gas, chemical processing, nuclear power plants, aerospace, shipbuilding, rail transport, and architectural metal structures.

What is the official examination structure for the Bac Pro TCI?

Created by the Arrêté du 26 février 2018, with the règlement d'examen replaced by the Arrêté du 9 juillet 2018, the Bac Pro TCI carries a total obligatory coefficient of 29. The professional units are E2 Analyse et exploitation de données techniques (practical, 3 h, coef 5) and the E3 block (coef 12): E31 Fabrication d'un ensemble chaudronné (oral, coef 6), E32 Réhabilitation sur chantier (practical, 4 h, coef 4), E33 Économie-gestion (written, 2 h, coef 1), and E34 Prévention-santé-environnement (written, 2 h, coef 1). The general units are E1 mathematics and physical-chemical sciences (coef 3), E4 modern language (coef 2), E5 French, history-geography and EMC (coef 5), E6 applied arts (coef 1), and E7 physical education (coef 1). Candidates must obtain an overall weighted average of at least 10.0 out of 20.

What are the fees and registration procedures for candidates?

Public examination registration is entirely free of charge (0 €) for both school pupils, apprentices, and individual candidates (candidats libres) via the French national examination portal Cyclades (cyclades.education.gouv.fr). Registration typically opens in October-November for the annual spring session.

Which construction and welding standards are tested in the Bac Pro TCI?

Key standards include the French CODAP (Code de construction des appareils à pression) and European EN 13445 for pressure vessels, NF EN ISO 9606-1 for welder qualification, NF EN ISO 15614-1 for welding procedure qualification (DMOS/QMOS), NF EN ISO 5817 for weld defect acceptance levels, NF EN ISO 2553 for symbolic representation of welds on blueprints, and the European Pressure Equipment Directive (DESP 2014/68/EU).

Why is this practice question bank presented in English for a French diploma?

This 100-question practice bank is an English-language MCQ study adaptation developed by OpenExamPrep for international technicians, engineering students, and bilingual boilermakers seeking comprehension of French boilermaking and welding codes. It tests core technical principles, calculations, and standards while explicitly retaining official French trade terminology. It does not replace the mandatory workshop, on-site, and oral examination units.