02/02/2026
Top 50 Must-Revise Concepts – GATE 2026 Chemical Engineering
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T-Theories, P-Numericals
⚙️ Process Calculations + Thermodynamics (~20–25 marks)
🔫 👉 Steady & unsteady mass balances (incl. recycle/purge) [P]
🔫 👉 Energy balance (open & closed systems) [P]
🔫 👉 Degree of freedom (DOF) & Gibb’s phase rule [T+P]
🔫 👉 First & Second laws, entropy balance [P]
🔫 👉 Pure substance properties & steam tables [P]
🔫 👉 VLE (Raoult’s law, non-ideal systems) [P]
🔫 👉 Chemical reaction equilibrium [P]
🌊 Fluid Mechanics + Mechanical Operations (~11–14 marks)
🔫 👉 Fluid statics & Bernoulli equation [P]
🔫 👉 Laminar/turbulent flow, friction factor [P]
🔫 👉 Dimensional analysis & similitude [P]
🔫 👉 Pipe flow, flow meters [P]
🔫 👉 Pumps & compressors [P]
🔫 👉 Packed beds, fluidization [P]
🔫 👉 Particle size, filtration & sedimentation [P]
🌡 Heat Transfer (~10–12 marks)
🔫 👉 Steady & unsteady conduction [P]
🔫 👉 Convection correlations & boundary layer [P]
🔫 👉 Radiation & view factors [P]
🔫 👉 Heat exchangers (LMTD & NTU) [P]
🔫 👉 Evaporators, boiling & condensation [P]
⚗️ Mass Transfer (~12–15 marks)
🔫 👉 Fick’s law & molecular diffusion [P]
🔫 👉 Mass transfer coefficients & analogies [P]
🔫 👉 Distillation (McCabe–Thiele) [P]
🔫 👉 Absorption & stripping [P]
🔫 👉 Extraction, drying, humidification [P]
🔫 👉 Membrane separations (RO, UF basics) [T]
🧪 Chemical Reaction Engineering (CRE) (~12–15 marks)
🔫 👉 Rate laws & Arrhenius equation [P]
🔫 👉 Ideal reactors (Batch, CSTR, PFR) [P]
🔫 👉 Multiple reactions (yield, selectivity) [P]
🔫 👉 RTD & non-ideal reactors [P]
🔫 👉 Non-isothermal reactors [P]
🔫 👉 Catalysis & diffusion effects [T+P]
🎛 Instrumentation & Process Control (~6–8 marks)
🔫 👉 Sensors & measurements [T]
🔫 👉 Transfer functions & dynamic response [P]
🔫 👉 PID controllers & tuning [P]
🔫 👉 Stability & frequency response [P]
💰 Plant Design & Economics (~4–6 marks)
🔫 👉 Cost estimation & cost indices [P]
🔫 👉 Depreciation & profitability analysis [P]
🔫 👉 Equipment sizing basics [P]
🏭 Chemical Technology (~4–6 marks)
🔫 👉 Fertilizers (Ammonia, Urea) [T]
🔫 👉 Sulfuric acid & chlor-alkali processes [T]
🔫 👉 Petroleum refining & petrochemicals [T]
🔫 👉 Polymers (PE, PP, PVC) [T]