The ITBP AC Engineer written exam has two papers. Paper I is objective — General Awareness, Reasoning, Maths, English, and a trade-specific section. Paper II is descriptive — a deep dive into your engineering branch. Most candidates underestimate Paper II because it is branch-specific and goes beyond basics. This article covers both papers in full, with topic lists for each engineering branch.
Exam Pattern Overview
| Paper | Type | Duration | Language |
|---|---|---|---|
| Paper I | Objective (MCQ) | As per notification | Bilingual (Hindi/English) |
| Paper II | Descriptive (Written) | 2 hours | Bilingual (Hindi/English) |
Exact question count and marks per paper: refer to the official detailed notification on recruitment.itbpolice.nic.in
Paper I — Subject-Wise Topics
General Awareness & Current Affairs
- Current events — national and international (last 6–12 months)
- Indian polity and governance — Constitution, Parliament, Supreme Court
- History of India — Freedom movement, major events, rulers
- Geography — physical, economic, and social geography of India
- Economy — Union Budget basics, GDP, RBI, Five-Year Plans
- Science & Technology — recent discoveries, space missions (ISRO), defence developments
- Environment — national parks, wildlife, climate agreements
- Sports — major national/international tournaments and winners
- Awards — National awards, Nobel, Bharat Ratna
- ITBP-specific — mandate, history, border areas patrolled
Reasoning Ability
- Series — number series, alphabet series, mixed series
- Analogies — number, letter, word analogies
- Classification (Odd One Out)
- Coding-Decoding
- Blood relations
- Direction and distance
- Seating arrangement (linear and circular)
- Syllogism
- Non-verbal reasoning — pattern, mirror image, paper folding
Numerical Aptitude
- Number system, HCF, LCM
- Percentage, profit & loss, discount
- Simple and compound interest
- Ratio and proportion
- Time, speed, and distance
- Work and time
- Mensuration — area and volume of 2D/3D shapes
- Data interpretation — tables, bar graphs, pie charts
- Basic trigonometry and geometry
General English
- Reading comprehension
- Fill in the blanks (grammar-based)
- Error spotting
- Synonyms, antonyms, one-word substitution
- Sentence rearrangement (Para-jumbles)
- Idioms and phrases
- Active/Passive voice, Direct/Indirect speech
Engineering Trade Subject — Paper I (Objective)
This section tests core concepts from your engineering branch. The objective section covers fundamentals — topics that appear in university exams and standard textbooks.
Paper II — Engineering Branch Topics
Paper II is descriptive. You will need to write detailed answers, solve numerical problems, and explain concepts. The depth required is at final-year B.E./B.Tech level.
Civil Engineering
- Structural Analysis — trusses, beams, bending moment and shear force diagrams
- RCC Design — IS code provisions, beam/column/slab design
- Fluid Mechanics & Hydraulics — Bernoulli's equation, pipe flow, open channel flow
- Soil Mechanics — Mohr-Coulomb, bearing capacity, consolidation, slope stability
- Transportation Engineering — highway design, flexible/rigid pavements, IRC standards
- Environmental Engineering — water treatment, sewage treatment, pollution control
- Construction Materials & Technology — cement, concrete mix design, steel
- Surveying — levelling, traversing, contour maps
- Estimation & Costing — CPWD norms, rate analysis
Electrical Engineering
- Basic Electrical Circuits — Kirchhoff's laws, network theorems (Thevenin, Norton, Superposition)
- Electrical Machines — DC motors/generators, transformers, induction motors, synchronous machines
- Power Systems — transmission lines, load flow, fault analysis, protection systems
- Control Systems — transfer functions, Bode plot, root locus
- Measurements & Instrumentation — ammeters, voltmeters, energy meters, CRO
- Power Electronics — thyristors, rectifiers, inverters, choppers
- Digital Electronics — logic gates, combinational & sequential circuits, number systems
- Electrical Installation & Wiring — IS codes, earthing standards
Mechanical Engineering
- Engineering Mechanics — statics, dynamics, friction, virtual work
- Strength of Materials — stress-strain, bending, torsion, columns
- Theory of Machines — linkages, gear trains, cams and followers, vibrations
- Thermodynamics — laws, thermodynamic cycles (Rankine, Otto, Diesel, Brayton)
- Fluid Mechanics — viscosity, Bernoulli's theorem, pipe flow, hydraulic machines
- Heat Transfer — conduction, convection, radiation, heat exchangers
- Manufacturing Processes — casting, welding, machining, forming
- Machine Design — factor of safety, fatigue, design of shafts, keys, couplings
- Refrigeration & Air Conditioning — vapour compression cycle, psychrometrics
Preparation tip: For Paper II, focus on numerical problem-solving — not just theory. Government engineering exams typically ask you to apply formulas to solve problems. Practice from standard reference books (IS codes for Civil, standard university textbooks for Electrical and Mechanical). GATE preparation material is excellent for Paper II topics.
Recommended Books & Resources
| Subject | Recommended Reference |
|---|---|
| General Awareness | Lucent's GK, current affairs monthly magazine |
| Reasoning | R.S. Aggarwal — Verbal and Non-Verbal Reasoning |
| Maths | R.S. Aggarwal — Quantitative Aptitude |
| English | Wren & Martin, Word Power Made Easy (Norman Lewis) |
| Civil Engineering | IS codes (IS 456, IS 800), R.K. Bansal (Fluid Mechanics), GATE Civil preparation books |
| Electrical Engineering | Nagrath & Kothari (Electrical Machines), GATE Electrical preparation books |
| Mechanical Engineering | R.S. Khurmi (Theory of Machines, Strength of Materials), GATE Mechanical books |
Paper I — Topic Importance & How to Prioritise
Not all topics in Paper I carry equal weight. Based on the pattern of similar CAPF/paramilitary engineering exams, here is how to allocate your preparation time:
| Subject | Estimated Weightage | Difficulty | Preparation Priority |
|---|---|---|---|
| General Awareness | High | Low-Medium | High — daily news + Lucent's GK |
| Reasoning | Medium-High | Medium | High — scoring with practice |
| Numerical Aptitude | Medium | Medium | Medium — focus on fast calculation |
| General English | Medium | Low | Medium — grammar + vocab |
| Trade (Engineering) | High | High | Highest — your branch concepts |
4-Month Preparation Plan
| Month | Focus Area | Daily Hours |
|---|---|---|
| Month 1 | Engineering fundamentals (Paper II core concepts) + Maths basics | 4–5 hrs engineering, 1 hr maths |
| Month 2 | Complete Paper II topics + GK foundation (Lucent's + current affairs) | 3 hrs engineering, 2 hrs GK/English |
| Month 3 | Reasoning + Aptitude + Paper I mock tests + Paper II numericals | 2 hrs each subject, 1 hr mock |
| Month 4 | Full mock tests (Paper I+II) + Revision + Weak area targeting | 1 full mock/day + 2 hrs revision |
Paper II Deep-Dive — Most Important Topics by Branch
Civil Engineering — High-Priority Topics
- RCC Design (IS 456:2000): Singly/doubly reinforced beams, T-beams, column design, footings — numericals are always asked
- Soil Mechanics: Terzaghi's bearing capacity, consolidation settlement, Mohr-Coulomb failure criterion — these are reliable scoring topics
- Structural Analysis: Bending moment and shear force diagrams for different loading conditions on simply supported, cantilever, and continuous beams
- Fluid Mechanics: Bernoulli's equation applications, venturimeter/orifice problems, Manning's equation for open channel flow
- Highway Engineering: CBR method, flexible pavement design (IRC:37), rigid pavement (IRC:58)
- Environmental Engineering: Water treatment steps (coagulation-flocculation-sedimentation-filtration-disinfection), BOD/COD calculations
Electrical Engineering — High-Priority Topics
- Transformers: EMF equation, efficiency, regulation, all-day efficiency — very frequently asked
- Induction Motors: Slip, torque-speed characteristics, starting methods, efficiency
- Network Theorems: Thevenin, Norton, Superposition, Maximum Power Transfer — numerical problems
- Power Systems: Per-unit system, fault analysis (3-phase symmetrical fault), load flow basics
- DC Machines: EMF equation, armature reaction, commutation, speed control methods
- Measurements: Wheatstone bridge, kelvin bridge, CT/PT, errors in instruments
Mechanical Engineering — High-Priority Topics
- Thermodynamic Cycles: Derivation and efficiency of Rankine, Otto, Diesel, Brayton cycles — numericals with P-V/T-S diagrams
- Strength of Materials: Bending stress, shear stress distribution, deflection of beams, Euler's column buckling
- Theory of Machines: Gear trains (simple, compound, epicyclic), velocity analysis of mechanisms, critical speed of shafts
- Fluid Mechanics: Continuity equation, Bernoulli's theorem, Reynolds number, pipe losses (Darcy-Weisbach)
- Manufacturing: Cutting forces in machining (merchant's theory), welding processes and their applications
- Heat Transfer: Fin efficiency, log mean temperature difference (LMTD), NTU method for heat exchangers
Paper II — How to Write Answers to Score Maximum
Paper II is descriptive. Most candidates lose marks not because they don't know the answer but because they write poorly structured responses. Follow this format:
- State the formula/theorem first — examiners look for this upfront
- Define all variables — don't skip units
- Show working step by step — partial marks are given for correct working even if the final answer is wrong
- Draw a diagram wherever applicable — for civil/mechanical structures, a quick sketch adds clarity and marks
- State the final answer clearly with proper units in a box or underline
Recommended Mock Test Strategy
By Month 3, start writing full-length mock tests under timed conditions. For Paper I, 60–70 attempts with 85%+ accuracy is a competitive score. For Paper II, practice writing timed answers — you must complete the paper in 2 hours. Time yourself strictly. GATE previous year questions are the best resource for Paper II practice.
ITBP-Specific GK — What You Must Know
Government recruitment exams for paramilitary forces always include force-specific general awareness questions. For ITBP, expect 3–5 questions directly related to the force. Cover these facts:
| Topic | Key Facts |
|---|---|
| ITBP Formation | Raised on 24 October 1962, after the India-China war. Raised as Central Reserve Police (Border) initially, renamed ITBP. |
| Full Form | Indo-Tibetan Border Police |
| Ministry | Ministry of Home Affairs (MHA), Government of India |
| Mandate | Guarding 3,488 km of the India-China (Tibet) border. Deployed in Ladakh, Himachal Pradesh, Uttarakhand, Sikkim, Arunachal Pradesh. |
| Motto | Shaurya Dridhata Karma Nishtha (Valour, Determination, Devotion to Duty) |
| HQ | New Delhi (with sector HQs at Chandigarh, Lucknow, Patna, Guwahati) |
| ITBP Academy | Mussoorie, Uttarakhand (officer training); Bhanu, Haryana (recruit training) |
| Notable Operations | Kargil War (1999), Char Dham Yatra security, VIP protection, Galwan follow-up deployment (2020) |
General English — High-Impact Topics
For officer-level exams, English is tested at a higher standard than constable exams. Focus on these:
- One-word substitution: 5–8 questions typically. Learn 100+ common substitutions (e.g., "Omnivore" — one who eats both plants and animals)
- Idioms and Phrases: 3–5 questions. Focus on common military/formal idioms
- Reading Comprehension: 1 passage, 4–5 questions. Read the passage fully before answering — do not skim
- Sentence correction: Subject-verb agreement, tense errors, preposition usage — these are the most common error types
- Vocabulary (Synonyms/Antonyms): Focus on formal/academic English words that appear in government communication
Current Affairs — 6-Month Coverage Plan
The exam will likely be held 4–6 months after the application deadline (May 2026). That means the current affairs window will cover approximately November 2025 – October 2026. Key areas to track:
- India-China border developments, LAC updates, infrastructure projects on China border
- Union Budget 2026 — key allocations for defence and infrastructure
- New government schemes — PM-related, MHA-related
- Defence acquisitions — new weapons, agreements, joint exercises
- ISRO missions — especially any launches in 2026
- Important national awards (Padma, Bharat Ratna), sports results
- Constitutional/legal updates — amendments, Supreme Court judgements
Read one good newspaper daily (The Hindu or Indian Express) or use a reliable current affairs monthly compilation. 20 minutes per day for 4 months is enough.
How ITBP Engineering Exam Differs from GATE
If you have GATE preparation experience, you have a strong base for Paper II. However, note these differences:
- GATE: 65 questions, 3 hours, highly analytical, GATE-specific question style
- ITBP Paper II: Descriptive — you write answers, not tick options. Requires clear communication of concepts, not just numerical answers
- Depth level: ITBP Paper II is at final-year B.E. level — not the research-level depth of GATE. Core concepts applied to practical scenarios
- IS codes (Civil): More relevant for ITBP than for GATE — government infrastructure context means IS 456, IS 800, IRC codes are directly applicable
📋 Apply: ITBP AC Engineer 2026 — Online Form (Last Date: 20 May 2026)
Also read: Selection Process 2026 | Eligibility 2026 | Salary 2026
