Free Practice Questions for Iran Nezam Civil Design Exam
Exam-style questions and explanations by OpenExamPrep.
Loading practice questions...
Explore More Iran Construction Engineering Org (IRCEO / Nezam Mohandesi)
Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.
Key Facts: Iran Nezam Civil Design Exam Exam
60
Multiple-Choice Questions
inbr.ir Official Specification
240 Min
Written Paper Duration (4 Hours)
inbr.ir Official Schedule
50%
Net Passing Score Threshold
IRCEO Licensure Criteria
-1/3
Negative Marking Penalty
Sazman-e Sanjesh Exam Rules
Open Book
Authorized Reference Permitted
INBR Examination Regulations
2 Stages
Written Paper Plus Compulsory Scientific Interview
inbr.ir Results Announcements
The Iran Nezam Civil Design written paper is a 240-minute, 60-MCQ open-book professional examination with 1/3 negative marking and a 50% passing threshold, administered by inbr.ir, and is followed by a compulsory scientific interview before the pass is confirmed. This practice bank provides rigorous English-language calculation and design practice questions with comprehensive step-by-step solutions referencing INBR Topics 6, 7, 8, 9, 10 and Standard 2800.
Sample Iran Nezam Civil Design Exam Practice Questions
Try these sample questions to review concepts for the Iran Nezam Civil Design Exam exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 102+ question experience with AI tutoring.
1According to INBR Topic 9 (مبحث نهم - بتن آرمه), a rectangular reinforced concrete beam has a width b = 300 mm, effective depth d = 500 mm, concrete compressive strength fc = 25 MPa, and steel yield strength fy = 400 MPa. If the beam is reinforced with 3 phi 25 tension rebars (total As = 1473 mm²), what is the depth of the equivalent rectangular Whitney compressive stress block (a)?
2For the singly reinforced concrete beam in question 001 (b = 300 mm, d = 500 mm, fc = 25 MPa, fy = 400 MPa, As = 1473 mm², a = 92.42 mm), what is the nominal flexural moment capacity Mn in kN·m?
3According to INBR Topic 9, for a rectangular concrete beam with fc = 25 MPa (beta1 = 0.85) and fy = 400 MPa, what is the balanced reinforcement ratio (rho_b)?
4Under INBR Topic 9, what is the net tensile strain (epsilon_t) at the extreme tension reinforcement layer for a beam with d = 600 mm and neutral axis depth c = 180 mm when the extreme concrete fiber compressive strain reaches epsilon_cu = 0.003?
5A rectangular reinforced concrete beam has width b = 250 mm, effective depth d = 450 mm, concrete strength fc = 25 MPa, and rebar yield strength fy = 400 MPa. According to INBR Topic 9, what is the minimum required area of tension reinforcement (As,min)?
6A reinforced concrete beam section has b = 300 mm, h = 600 mm, and concrete compressive strength fc = 25 MPa. Assuming normalweight concrete (lambda = 1.0) and uncracked elastic behavior, what is the cracking moment (Mcr) according to INBR Topic 9?
7A doubly reinforced beam has b = 300 mm, d = 550 mm, and d' = 50 mm. The tension reinforcement is As = 3000 mm² and compression reinforcement is As' = 1000 mm². Materials are fc = 30 MPa (beta1 = 0.85) and fy = 400 MPa (Es = 200,000 MPa). If the neutral axis depth is calculated as c = 125 mm, does the compression steel yield at ultimate limit state?
8According to INBR Topic 9, what is the effective flange width (beff) for a symmetrical T-beam monolithic with a concrete slab, having web width bw = 300 mm, slab thickness hf = 120 mm, beam clear span Ln = 6000 mm, and clear distance between adjacent webs s = 2400 mm?
9A rectangular concrete beam with bw = 300 mm and d = 500 mm is cast from normalweight concrete with fc = 25 MPa. According to INBR Topic 9, what is the nominal shear strength provided by concrete (Vc) under simplified design?
10A rectangular beam with bw = 300 mm and d = 500 mm (fc = 25 MPa, Vc = 125 kN) is subjected to a factored shear force Vu = 240 kN. If phi_v = 0.75 and two-legged phi 10 stirrups (Av = 157 mm², fyt = 400 MPa) are used, what is the maximum required stirrup spacing (s) based on shear strength?
About the Iran Nezam Civil Design Exam Exam
The Civil Design & Calculation Licensure Examination (آزمون ورود به حرفه مهندسان عمران - محاسبات) is Iran's premier statutory qualification examination for civil engineers seeking statutory licensure (پروانه اشتغال به کار مهندسی پایه سه) to calculate, design, and certify structural engineering plans and calculations. Administered under the auspices of the Ministry of Roads and Urban Development and the Construction Engineering Organization of Iran (IRCEO / سازمان نظام مهندسی ساختمان), the written paper consists of 60 intensive multiple-choice questions administered over 240 minutes. Since the 1404 sittings, candidates who pass the written paper in the calculation (محاسبات) qualification must also pass a compulsory scientific interview (مصاحبه علمی) before the result is confirmed; the written paper is conducted in an open-book (کتابباز) format, allowing candidates to consult official National Building Regulation codes (مباحث مقررات ملی ساختمان), design manuals, and approved scientific non-programmable calculators. Scoring incorporates a strict negative marking penalty where every three incorrect answers cancel one correct answer (1/3 point deducted per error), requiring a net score of at least 50% to pass. The comprehensive syllabus encompasses INBR Topic 6 (Building Loads), INBR Topic 7 (Geotechnical Engineering & Foundations), INBR Topic 8 (Masonry Structures), INBR Topic 9 (Reinforced Concrete Design), INBR Topic 10 (Steel Structures Design), and Iranian Standard 2800 (Seismic Design of Buildings). Please note that this question bank is an independent English-language multiple-choice study adaptation designed for bilingual engineers and international academic preparation; it is not an official translation or released past paper.
Exam sponsor: Office of National Building Regulations and Building Control (inbr.ir), Ministry of Roads and Urban Development; delivered nationwide by the National Organization for Educational Testing (Sazman-e Sanjesh) educational services company. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.
Assessment
Two stages. Stage 1: a written paper of 60 four-option multiple-choice calculation and design questions covering INBR Topics 6, 7, 8, 9, 10 and Standard 2800 (Seismic Code). Stage 2: a compulsory scientific interview (مصاحبه علمی) held at the provincial Roads and Urban Development office, covering the same code sources plus practical use of a structural analysis/design software package chosen by the candidate. Failure or non-attendance at the interview voids the written pass.
Time Limit
240 minutes (written paper)
Passing Score
50 out of 100 (50%) — clause 6-4 of the official 1405 registration instruction, calculated after the negative-marking deduction
Exam / Certification Fees
Set per sitting and shown in the inbr.ir registration cart; the official 1405 registration instruction does not publish a fixed amount
Exam sponsor websiteFees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.
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.
Reinforced Concrete Structures Design (INBR Topic 9)
Whitney stress block formulation, flexural strength of rectangular and T-beams, balanced and minimum steel limits, shear design with stirrups (Vc and Vs), web crushing thresholds, torsion reinforcement, column short/slender design and P-M interaction, tension development length, lap splices, and seismic detailing provisions for special/intermediate moment frames and ductile structural walls.
Structural Steel Design (INBR Topic 10)
LRFD and ASD design methodologies for structural steel: tension members (gross yielding, net fracture, shear lag factor U, staggered holes, block shear rupture), compression members (Euler buckling, flexural buckling curves, effective length factor K), flexural members (compactness criteria, lateral torsional buckling, plastic moment Mp), beam-columns, welded/bolted connections (fillet welds, slip-critical and bearing bolts), and seismic detailing of SMF, SCBF, and EBF systems.
Seismic Design & Standard 2800 (آییننامه ۲۸۰۰)
Iranian Code for Seismic Resistant Design of Buildings (Standard 2800 4th Edition): seismic hazard zoning A, soil types I-IV, design acceleration spectrum B, building importance factor I, structural response modification factor Ru, empirical and analytical building period T limits, base shear V = C·W, vertical distribution of lateral forces, allowable story drift limits, P-delta stability checks, and geometric, torsional, and stiffness irregularities.
Building Loads & Combinations (INBR Topic 6)
Determination of dead loads from building construction components, occupancy live loads and statutory live load reduction criteria, ground and roof snow loads (Pf = 0.7·Cs·Ce·Ct·Is·Pg), snow drift against higher walls, wind velocity pressure (q = 0.613·V²·Kz...), external/internal pressure coefficients, gust effect factor, and ASD/LRFD ultimate load combinations including vertical earthquake ground motion.
Geotechnics & Foundation Engineering (INBR Topic 7)
Ultimate bearing capacity of shallow foundations (Terzaghi and Meyerhof formulations, shape and depth factors, groundwater table adjustments), 2:1 stress dispersion and 1D consolidation settlement, Rankine active and passive lateral earth pressures, tension crack depth in cohesive backfills, retaining wall stability (overturning, sliding, kern eccentricity), and deep axial pile load capacity.
Preparing for the Iran Nezam Civil Design Exam Exam
What You Need to Know
- Passing score: 50 out of 100 (50%) — clause 6-4 of the official 1405 registration instruction, calculated after the negative-marking deduction
- Assessment: Two stages. Stage 1: a written paper of 60 four-option multiple-choice calculation and design questions covering INBR Topics 6, 7, 8, 9, 10 and Standard 2800 (Seismic Code). Stage 2: a compulsory scientific interview (مصاحبه علمی) held at the provincial Roads and Urban Development office, covering the same code sources plus practical use of a structural analysis/design software package chosen by the candidate. Failure or non-attendance at the interview voids the written pass.
- Time limit: 240 minutes (written paper)
- Exam / certification fees: Set per sitting and shown in the inbr.ir registration cart; the official 1405 registration instruction does not publish a fixed amount Official sources
Using Our Practice Resources
- Work through all 102 available questions
- Review every answer and explanation
- Track weak areas and revisit them
- Use our AI tutor for tough concepts
Iran Nezam Civil Design Exam: Suggested Study Strategy
Frequently Asked Questions
What is the Iran Nezam Civil Design & Calculation examination?
The Civil Design & Calculation examination (آزمون ورود به حرفه مهندسان عمران محاسبات) is the national statutory licensing exam administered under the Iranian Ministry of Roads and Urban Development and the Construction Engineering Organization (IRCEO). Passing this exam confers the Grade 3 Professional Engineering License (پروانه اشتغال به کار مهندسی پایه سه) authorizing civil engineers to design, compute, and stamp structural drawings for buildings.
What is the format, duration, and passing score of the exam?
The written paper comprises 60 four-option multiple-choice questions administered over 240 minutes (4 hours). It is an open-book (کتابباز) exam, but incorporates negative marking where three incorrect answers cancel one correct answer (-1/3 mark per incorrect response). The passing score is 50% net correct. Candidates who clear the written paper are then invited to a compulsory scientific interview (مصاحبه علمی); the final result depends on passing both stages.
What building codes and standards are included in the syllabus?
The core syllabus covers the Iranian National Building Regulations (مقررات ملی ساختمان ایران): INBR Topic 6 (Building Loads), INBR Topic 7 (Geotechnical Engineering & Foundations), INBR Topic 8 (Masonry Buildings), INBR Topic 9 (Reinforced Concrete Structures), INBR Topic 10 (Steel Structures), and Iranian Standard 2800 (Seismic Resistant Design of Buildings).
What are the eligibility requirements to sit for the exam?
Candidates must hold an accredited Bachelor of Science (B.Sc.), Master's (M.Sc.), or Doctorate (Ph.D.) degree in Civil Engineering and have completed mandatory post-graduation practical experience: 3 years for B.Sc. graduates, 2 years for M.Sc. graduates, or 1 year for Ph.D. graduates, verified by the provincial engineering organization.
Why do candidates find this paper hard despite it being open book?
Candidates have 240 minutes for 60 complex numerical questions (an average of 4 minutes per question), so they must rapidly navigate voluminous code provisions, execute multi-step structural calculations without error, and avoid wild guessing because of the 1/3 negative marking penalty. The Office of National Building Regulations does not publish a pass rate for this qualification.
Is this question bank an official publication of IRCEO or inbr.ir?
No. This question bank is an independent English-language multiple-choice study adaptation designed for educational purposes, bilingual engineers, and international study. It strictly preserves authentic Iranian building code formulations, parameters, and calculation methodologies.