⚙️ OPTIONAL — MECHANICAL ENGINEERING

Papers: VI & VII · 500 marks. GS overlap: LOW (some GS-III industry, energy). Best for: mechanical engineering graduates with strong, recent command of core subjects.

⚠️ Verify against the current UPSC notification at upsc.gov.in.

PAPER I

1. Mechanics: (a) Mechanics of rigid bodies — equations of equilibrium in space and its application; first and second moments of area; simple problems on friction; kinematics of particles for plane motion; elementary particle dynamics. (b) Mechanics of deformable bodies — generalised Hooke's law and its application; design problems on axial stress, shear stress and bearing stress; material properties for dynamic loading; bending shear and stresses in beams; determination of principle stresses and strains — analytical and graphical; compound and combined stresses; bi-axial stresses — thin walled pressure vessel; material behaviour and design factors for dynamic load; design of circular shafts for bending and torsional load only; deflection of beam for different types of loading and support conditions — analytical and graphical methods; Torsion of shafts, transmission of power, close coiled helical springs; elastic instability of columns — Euler's Rankine's and Secant formulae.
2. Engineering Materials: basic concepts on structure of solids; crystalline materials; defects in crystalline materials; alloys and binary phase diagrams; structure and properties of common engineering materials; heat treatment of steels; plastics, ceramics and composite materials; common applications of various materials.
3. Theory of Machines: kinematic and dynamic analysis of planar mechanisms; cams; gears and gear trains; flywheels; governors; balancing of rigid rotors; balancing of single and multicylinder engines; linear vibration analysis of mechanical systems (single degree of freedom); critical speeds and whirling of shafts.
4. Manufacturing Science: (a) Manufacturing Process — machine tool engineering — merchant's force analysis; Taylor's tool life equation; conventional machining; NC and CNC machining processes; jigs and fixtures; non-conventional machining — EDM, ECM, ultrasonic, water jet machining etc.; application of lasers and plasmas; energy rate calculations; forming and welding processes — standard processes; metrology — concept of fits and tolerances; tools and gauges; comparators; inspection of length, position, profile and surface finish. (b) Manufacturing Management — system design — factory location — simple OR models; plant layout — methods based; applications of engineering economic analysis and break-even analysis for product selection, process selection and capacity planning; predetermined time standards. System planning — forecasting methods based on regression and decomposition; design and balancing of multi-model and stochastic assembly lines; inventory management — probabilistic inventory models for order time and order quantity determination; JIT systems; strategic sourcing; managing inter-plant logistics. System operations and control — scheduling algorithms for job shops; applications of statistical methods for product and process control; applications of control charts for mean, range, percent defective, number of defectives and defects per unit; quality cost systems; management of resources, organisation and implementation of computer integrated manufacturing systems.
5. Thermodynamics, Gas Dynamics and Turbo Machine: (a) Basic concepts of thermodynamics — laws, applications; heat and work transfer; entropy; availability; thermodynamic relations; properties of pure substances; ideal and real gases; thermodynamic cycles; gas power cycles; vapour power cycles; refrigeration cycles. (b) Gas dynamics — compressible flow; isentropic flow; normal and oblique shocks; flow through nozzles and diffusers. (c) Turbo machines — steam and gas turbines; impulse and reaction turbines; velocity diagrams; compressors — reciprocating and rotary.
6. Heat Transfer: conduction — one and two dimensional; fins; convection — free and forced; boiling and condensation; heat exchangers — LMTD and NTU methods; radiation — laws, shape factors, radiation exchange.

PAPER II

1. Fluid Mechanics: fluid properties; fluid statics; kinematics; dynamics — Bernoulli, momentum and energy equations; dimensional analysis and similitude; laminar and turbulent flow; flow through pipes; boundary layer theory; drag and lift; flow measurement.
2. Steam Engineering: steam generation — boilers, mountings and accessories; steam power cycles — Rankine, reheat, regenerative; steam turbines; condensers; cooling towers; nozzles.
3. Internal Combustion Engines: classification; SI and CI engines; combustion phenomena; knocking; fuels and their properties; carburetion and fuel injection; supercharging; engine testing and performance; emissions and control.
4. Refrigeration and Air-conditioning: vapour compression and vapour absorption systems; refrigerants; psychrometry; comfort and industrial air conditioning; cooling load calculations; air conditioning equipment.
5. Machine Design: design against static and dynamic loading; failure theories; design of joints — riveted, welded, bolted; design of shafts, keys, couplings; design of bearings — sliding and rolling contact; design of gears; design of brakes and clutches; design of springs; design of pressure vessels.
6. Mechatronics and Robotics: sensors and actuators; microprocessors in mechanical systems; control systems basics; robot configurations; kinematics; drives and control; applications in manufacturing.

BOOKLIST

Standard undergraduate texts: Strength of Materials — Sadhu Singh / Timoshenko · Theory of Machines — S.S. Rattan / Thomas Bevan · Thermodynamics — P.K. Nag · Heat Transfer — R.C. Sachdeva / Holman · Fluid Mechanics — R.K. Bansal / Modi & Seth · IC Engines — V. Ganesan / Mathur & Sharma · Refrigeration & AC — C.P. Arora / Domkundwar · Machine Design — V.B. Bhandari · Manufacturing — P.N. Rao / Kalpakjian · Industrial Engineering/OR — O.P. Khanna / Kanti Swarup.

STRATEGY

• Numerical practice is the core — solve daily; present with units and clear steps.
• Draw diagrams — cycles, velocity diagrams, free body diagrams, component sketches.
• Use design data handbooks where permitted; memorise key formulas otherwise.
• Practise full timed papers — completing the paper is the main challenge.
• Solve 15 years of PYQs.
• Only choose if fundamentals are current.

Pros: objective; static syllabus; small competition pool. Cons: no GS overlap; broad syllabus; heavy numerical/drawing load; unforgiving of rusty fundamentals.