| Subject | Approx. Qs | Topics seen |
|---|---|---|
| Theory of Machines / Vibrations | ~12 | Gear ratio, spring stiffness (series/parallel), governor hunting, forced vibration, natural frequency, damping coefficient, cams, degrees of freedom, kinematic pairs |
| Manufacturing (Metallurgy/Welding/Machining) | ~18 | Bearings, TTT phases (austenite/bainite/martensite), ductility, welding (arc, solid-state, autogenous), extrusion, casting, lathe operations, tool life (Taylor’s eqn), tool signature |
| Industrial Engineering / Production Mgmt | ~10 | Time & work study, break-even analysis, forecasting (exponential smoothing, Delphi), Gantt chart, SQC, CPM/PERT (EF/ES/LF/LS), scheduling |
| Thermodynamics | ~15 | Gas laws (Boyle’s, Charles’, Gay-Lussac’s), enthalpy, specific heat, Rankine efficiency, heat transfer laws, total heat, IC engine performance (air-fuel ratio, knocking, octane number) |
| Heat Transfer / Refrigeration & AC | ~8 | Conduction/convection/radiation, steady-state heat transfer, insulation, COP of Carnot refrigerator, psychrometry (humidity ratio, sensible heat factor) |
| Fluid Machinery (Pumps/Turbines) | ~8 | Reciprocating pump air vessels, centrifugal pump head, cavitation, impulse/reaction turbines, steam turbine efficiency |
| Engineering Mechanics | ~12 | Newton’s laws, work-energy theorem, pulley-friction systems, projectile height ratio, SHM, resultant of forces, compound levers, potential/kinetic/total energy |
| Strength of Materials | ~15 | Stress-strain, modulus of rigidity, Poisson’s ratio, thin shells (hoop stress), spring shear stress, shear force/BM diagrams, torsional stiffness, framed structures (perfect/redundant), degrees of freedom of mechanisms |
| Basic Gear Theory | ~3 | Pitch circle diameter, gear types (rack-pinion, worm, bevel), minimum teeth to avoid interference |
Key trends:
- Numerical-heavy— dense workings visible for nearly every SOM, mechanics, thermodynamics and vibration question.
- Manufacturing/Production is the single largest bloc (~28 questions combined for manufacturing + industrial engineering)
- Thermodynamics + Heat Transfer + Fluid Machinery together (~31 Qs) form the second-largest bloc — core “applied thermal” content dominates the back half of the paper (Q37–73).
- SOM and Theory of Machines are consistently mixed in throughout, especially concentrated at the very end (Q82–100) — mechanisms, torsion, beams, springs all bunched together as a “final stretch.”
- High-yield repeat concepts: gas laws (4 questions alternating between them), stress-strain/elastic constants (E, G, μ relations — 3 questions), and beam SF/BM (4 questions) — good areas for quick formula revision.
- Conceptual (non-numerical) questions dominate manufacturing/production topics, while mechanics, SOM, thermodynamics, and vibrations require calculation — so time allocation should favor the numerical sections.
Suggestion: Prioritize revising Thermodynamics gas-law relations, SOM elastic-constant formulas, and Theory of Machines vibration formulas (ωₙ, Cc, spring combinations) — these recur with direct numerical variants and are high-yield for quick, accurate scoring.
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