NTPC Assistant Executive Operation Syllabus 2026: CBT Pattern & Topic-wise Guide
NTPC Advertisement 05/26 for 250 Assistant Executive (Operation) posts will involve a Computer Based Test (CBT) as the primary selection stage. The exam tests your technical knowledge in either Mechanical or Electrical Engineering, plus General Awareness and Reasoning. There is no GATE requirement — this is NTPC's own in-house test. Here is the complete breakdown of the syllabus and how to prepare efficiently.
👉 NTPC AE Operation Eligibility 2026 — verify your qualification and power plant experience criteria first
Selection Process Overview
| Stage | Type | Details |
|---|
| Stage 1 | Shortlisting | Based on academic marks, qualification percentage, and experience relevance |
| Stage 2 | Computer-Based Test (CBT) | 200 questions | 200 marks | Objective MCQ |
| Stage 3 | Document Verification | Degree, experience certificate, certificates |
| Stage 4 | Medical Examination | Mandatory — NTPC Chief Medical Officer decision is final |
There is no GD/Interview round. The entire merit is based on the CBT score (after shortlisting), making exam preparation the single most important factor in selection.
CBT Exam Pattern
| Section | Questions | Marks | Time (indicative) |
|---|
| Technical Knowledge (Mechanical or Electrical) | 100 | 100 | ~55 minutes |
| General Awareness / Current Affairs | 50 | 50 | ~25 minutes |
| Reasoning Ability / Aptitude | 50 | 50 | ~30 minutes |
| Total | 200 | 200 | ~110 minutes |
Negative marking: Not confirmed in the official notification — verify in the admit card/exam schedule when released. Most NTPC CBTs for contract roles do not have negative marking, but this should be confirmed officially.
Medium: English only (this is a technical engineering exam).
👉 NTPC AE Operation Salary 2026 — know the ₹55,000 consolidated pay and what it means for your take-home
Technical Syllabus — Mechanical Engineering
The technical section tests your knowledge of power plant operations. Focus on topics directly relevant to thermal power station work:
Power Plant Engineering (Most Important)
- Rankine cycle — basic and modified (reheat, regenerative)
- Boiler types: Fire tube vs Water tube, Subcritical vs Supercritical vs Ultra-supercritical
- Boiler mountings and accessories: Safety valve, steam stop valve, feed pump, economiser, air preheater, superheater
- Steam turbines: Impulse vs Reaction, stages, governing methods
- Condenser: Types, condenser efficiency, vacuum maintenance
- Cooling towers: Natural draft vs Mechanical draft, cooling tower performance
- Ash handling systems: Wet and dry ash disposal, fly ash collection (ESP)
- Fuel handling: Coal milling (ball mill, bowl mill), pulverised fuel firing
- Flue gas path: Economiser → Air Preheater → ESP → ID fan → Chimney
Thermodynamics
- Zeroth, First, Second, Third Laws of Thermodynamics
- Work and heat — sign convention, path functions vs state functions
- Carnot cycle and Carnot efficiency
- Steam tables: saturation, superheated steam, quality
- Enthalpy, entropy — T-S and H-S diagrams
- Mollier diagram applications
Fluid Mechanics
- Bernoulli's equation and applications
- Flow through pipes: Reynolds number, Darcy-Weisbach equation, losses
- Centrifugal pumps: characteristics, cavitation, NPSH, specific speed
- Fans and blowers: FD fan, ID fan, PA fan — performance curves
- Venturimeter, orifice meter — flow measurement
- Hydraulic turbines: Pelton, Francis, Kaplan (basic concept)
Heat Transfer
- Conduction: Fourier's law, thermal resistance, fins
- Convection: Newton's law, forced and natural convection, Nusselt number
- Radiation: Stefan-Boltzmann law, emissivity, view factor
- Heat exchangers: LMTD method, NTU method, parallel vs counter flow
Machine Design & Mechanical Components
- Stress, strain, factor of safety
- Shafts: torsion, combined loading
- Bearings: roller, ball, journal — selection and maintenance
- Couplings, seals, flanges — types and applications in pumps/compressors
- Valves: gate, globe, ball, butterfly, check — working principle and applications
Technical Syllabus — Electrical Engineering
Power Systems
- Generation, transmission, and distribution systems
- Single-line diagrams, per-unit system
- Load flow analysis: Gauss-Seidel, Newton-Raphson (concepts)
- Fault analysis: three-phase, single-line-to-ground, line-to-line
- Power factor correction, reactive power compensation
- EHV transmission: 220 kV, 400 kV, 765 kV lines in India
Power Plant Electrical Systems
- Unit Auxiliary Transformers (UAT) and Station Auxiliary Transformers
- HT switchgear: 6.6 kV, 11 kV — Circuit breakers (VCB, SF6)
- LT switchgear: 415 V MCC panels, bus ducts, cables
- Bus bar systems in power stations
- DC systems: 110V, 220V DC battery chargers, DCDB
- Generator transformer (GT) — step-up transformer, cooling types
Electrical Machines
- Synchronous generators: operating principles, excitation systems, AVR
- Transformers: equivalent circuit, efficiency, voltage regulation, parallel operation
- Induction motors: torque-speed characteristics, starting methods, VFD drives
- DC motors: types, speed control methods
Protection & Relay Systems
- Current transformers (CT) and potential transformers (PT)
- Over-current protection: IDMT relays, definite time relays
- Differential protection: for generators and transformers
- Distance protection (Impedance relay): concept and zones
- Buchholz relay, temperature relays for transformers
- Anti-islanding protection in grid-connected generators
Control & Instrumentation
- PLC/DCS basics: I/O modules, ladder logic, function blocks
- SCADA systems in power plants
- Sensors and transducers: pressure, temperature, flow, level instruments
- Control loops: PID controller, cascade control
- Lock-out/Tag-out (LOTO) safety procedures
General Awareness (50 Questions)
| Topic | Expected Coverage |
|---|
| Current Affairs | Last 6 months — National & International news |
| Energy sector in India | NTPC capacity, thermal vs renewable share, Ujjwal DISCOM Assurance Yojana (UDAY) |
| Indian Economy | GDP, Budget highlights, inflation, RBI policies |
| Government schemes | PM Kusum, PM-KUSUM, National Solar Mission, Smart Meter programme |
| Indian Polity | Constitution basics, Parliament, Union-State relations |
| Environment | Pollution norms (CPCB), SO2/NOx limits, FGD (Flue Gas Desulphurisation) |
| Science & Technology | Space missions (ISRO), nuclear energy, recent inventions |
| Sports, Awards | Recent Padma Awards, national sports achievements |
Reasoning Ability (50 Questions)
| Topic | Types of Questions |
|---|
| Series | Number series, letter series, mixed series |
| Analogies | Word analogies, number analogies |
| Coding-Decoding | Letter shifting, symbol coding |
| Blood Relations | Family tree problems |
| Direction Sense | 2D and 3D direction problems |
| Syllogism | All/Some statements, Venn diagram-based |
| Data Sufficiency | Is the data enough to answer? |
| Puzzles | Seating arrangement, floor arrangement |
| Non-verbal | Pattern completion, mirror images, paper folding |
Preparation Strategy
- Technical section (100 marks): This is where the exam is won or lost. Focus on Power Plant Engineering and the discipline-specific core (Thermal cycles / Power systems). Use your B.Tech textbooks + R.K. Bansal (Fluid Mechanics), P.K. Nag (Thermodynamics), or Nagrath & Kothari (Power Systems for Electrical).
- Current Affairs: Read one newspaper daily (The Hindu or Indian Express) + check the NTPC website for company-specific news.
- Reasoning: 50 questions is manageable in 30 minutes if you are fast. Practice previous year CAT, AFCAT, or RRB papers for speed.
- Time in exam: Spend 50–55 minutes on Technical, 25 minutes on GA, 25–30 minutes on Reasoning.
Frequently Asked Questions
Q: Does NTPC AE Operation exam have negative marking?
The official notification does not confirm negative marking. Most NTPC fixed-term contract CBTs do not apply negative marking, but you should verify this in the official exam schedule or admit card when released. Until confirmed, do not leave questions blank if you can make an educated guess.
Q: What is the difficulty level of the Technical section?
Moderate to difficult — comparable to GATE in terms of topics, but questions are more application-oriented and less calculation-heavy. Focus on concepts and practical power plant knowledge rather than complex derivations.
Q: Can a Mechanical engineer apply for the Electrical posts and vice versa?
No. NTPC AE Operation accepts only Mechanical or Electrical engineering graduates. Within the exam, you answer the Technical section based on your discipline. You cannot mix.
Q: Is there any interview round after CBT?
Based on the selection process described in the notification (CBT → Document Verification → Medical), there is no Personal Interview in this recruitment. Merit is determined purely by CBT score.
Q: How many months does it take from application to joining?
For contract recruitments at PSUs, the typical timeline is 2–4 months from the exam date to the final offer letter. Since the exam date is not yet announced, joining will likely be in Q3/Q4 2026.
Mechanical Engineering: Topic-wise Breakdown
The Technical Knowledge section for Mechanical candidates carries 100 out of 200 marks. The topic distribution is not officially published, but based on the operational profile of the AE (Operation) role, these domains consistently carry the highest weightage:
| Topic Area | Key Sub-topics | Expected Weightage |
|---|
| Power Plant Engineering | Rankine cycle and its modifications, boiler types (CFBC, AFBC, supercritical), steam turbine stages, condensers, cooling towers, ESP, coal handling plant, ash handling, auxiliary systems | 25–30 questions |
| Thermodynamics | First and second laws, Carnot cycle, entropy, availability and exergy, psychrometrics, refrigeration cycles | 15–18 questions |
| Fluid Mechanics | Bernoulli's theorem, flow measurement (orifice, venturi, pitot tube), centrifugal and axial pumps, hydraulic turbines, pipe networks | 15–18 questions |
| Heat Transfer | Conduction (Fourier's law, fins), convection (LMTD, NTU methods), radiation (Stefan-Boltzmann), heat exchangers, boilers and condensers | 12–15 questions |
| Strength of Materials | Stress-strain curves, bending moment and shear force diagrams, torsion, columns (Euler's formula), thin-walled pressure vessels | 10–12 questions |
| Engineering Materials & Manufacturing | Properties of metals, alloys, fatigue, creep, welding, NDT methods | 5–8 questions |
Power Plant Engineering is the single most important topic. If you have actual plant experience, you already know the practical side — but the exam tests textbook definitions (e.g., supercritical pressure values, specific heat ratios, efficiency formulas). P.K. Nag's Power Plant Engineering is the standard reference for this section.
Electrical Engineering: Topic-wise Breakdown
For Electrical candidates, the 100-mark technical section draws from core electrical subjects with a power-system emphasis suited to the AE (Operation) role:
| Topic Area | Key Sub-topics | Expected Weightage |
|---|
| Power Systems | Load flow analysis, symmetrical and unsymmetrical faults, per-unit system, protection relays (overcurrent, distance, differential), HVDC, power quality, load frequency control | 25–30 questions |
| Electrical Machines | DC motors and generators (characteristics, speed control), transformers (OC/SC tests, regulation, losses), induction motors (torque-slip, starting methods), synchronous machines | 20–22 questions |
| Power Electronics | Rectifiers, inverters, choppers, AC drives, FACTS devices | 10–12 questions |
| Control Systems | Transfer functions, block diagram reduction, signal flow graphs, time-domain and frequency-domain analysis, PID controllers, Bode plots, stability (Routh, Nyquist) | 10–12 questions |
| Electrical Measurements | CTs, PTs, energy meters (Ferraris wheel, digital), megger, earthing systems, instrument transformers | 8–10 questions |
| Basic Circuit Theory | KVL/KCL, Thevenin/Norton, transient response, resonance, three-phase circuits | 8–10 questions |
Power Systems and Electrical Machines together account for roughly half the technical marks. C.L. Wadhwa's Electrical Power Systems and P.S. Bimbhra's Electrical Machinery are the go-to books for Electrical candidates.
General Awareness: What to Prioritise
The 50-mark GA section is not just current affairs. For a power PSU exam, expect questions in these categories:
- Power sector current affairs: NTPC new projects, India's installed capacity milestones, renewable energy targets (500 GW by 2030), coal supply situation, DISCOM reforms.
- Government schemes: PM Kusum, RDSS (Revamped DISCOM Scheme), ISTS waiver policy, Green Hydrogen Mission.
- Static GK: Indian Constitution basics, Five-Year Plans legacy, important committees, national parks in states where NTPC plants are located.
- Science and technology: Basic physics and chemistry questions at Class 12 level.
30-Day Preparation Blueprint
| Week | Focus | Daily Hours |
|---|
| Week 1 | Core technical: Power Plant Engineering + Thermodynamics. Read P.K. Nag chapters 5–12 (steam power plant, boilers, turbines) and solve 20 numerical problems per day. | 4–5 hours technical |
| Week 2 | Fluid Mechanics + Heat Transfer + Strength of Materials (Mech) or Power Systems + Machines (Elec). Use GATE standard material. | 4–5 hours technical |
| Week 3 | Remaining technical topics + begin GA. Read 1 chapter of NTPC-relevant current affairs daily. Start mock tests — aim for 60%+ initially. | 3 hours technical + 1.5 hours GA |
| Week 4 | Mock tests only — 2 full-length tests per day. Analyse wrong answers. Focus on 5 topics where you are dropping the most marks. Revise formulae sheet. | 5 hours mock + review |
Frequently Asked Questions
Q: Is there negative marking in the CBT?
The official notification for Advt. 05/26 does not explicitly state negative marking. However, NTPC AE exams historically have not carried negative marking. Verify in the official admit card instructions before the exam — policies can change between recruitment cycles.
Q: How important is Reasoning vs. Technical in the final score?
The 50 Reasoning marks and 50 GA marks together equal the 100 Technical marks. In practice, Reasoning and GA are faster to score and most candidates clear these sections at 70%+. Your technical score differentiates you from other engineers. Focus 60% of your prep time on Technical and 40% on GA+Reasoning for the optimal outcome.
Q: Will the same question paper be used for Mechanical and Electrical candidates?
No. The Technical Knowledge section is separate for Mechanical and Electrical candidates. The GA and Reasoning sections are common. Posts are applied for separately (Operation-Mechanical vs Operation-Electrical), so you will only sit the technical paper for the discipline you applied under.
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