Which Mechanical Engineering topics matter most for UPSC ESE (IES)?

Thermodynamics, Power Cycles and IC Engines, Fluid Mechanics and Hydraulic Machines, Machine Design, Mechanisms, Vibrations and Manufacturing carry the highest question counts based on previous-year analyses.

Is this Mechanical Engineering material free?

Yes — every chapter, practice set and flashcard deck here is free. Premium mock tests and live courses from tutors are labelled separately.

UPSC ESE (IES)Mechanical Engineering

Mechanical Engineering for UPSC ESE (IES)

Thermodynamics, fluid machines, heat transfer, refrigeration, machine design, mechanisms and manufacturing.

📊 Mechanical stream: Prelims Paper II and both Mains papers

How toppers play this section

Sketch the cycle or draw the network first, and test every result against a known limit.

Chapters

Built to the UPSC ESE (IES) blueprint — notes, shortcuts, solved PYQ-style examples and practice in every chapter.

1Thermodynamics, Power Cycles and IC EnginesThe first and second laws, entropy and availability, ideal-gas processes, Carnot, Otto, Diesel and Brayton cycles, Rankine cycle with reheat and regeneration, and IC engine performance, with worked efficiency calculations.⏱ 8 min read

2Fluid Mechanics and Hydraulic MachinesViscosity and the momentum equation, forces from jets, dimensional analysis and similitude, boundary layers and drag, compressible flow relations, then Pelton, Francis and Kaplan turbines and centrifugal pumps with affinity laws, specific speed and cavitation.⏱ 9 min read

3Heat Transfer, Refrigeration and Air ConditioningConduction through walls, cylinders and fins, lumped transient analysis and the Biot number, convection correlations, radiation exchange, LMTD and effectiveness-NTU for heat exchangers, then vapour-compression refrigeration, refrigerants and psychrometric processes.⏱ 8 min read

4Machine Design, Mechanisms, Vibrations and ManufacturingFailure theories and fatigue design, shafts, springs, bearings and gears; degrees of freedom, four-bar linkages, flywheels, balancing and vibrations; then casting, welding, forming, machining and the Taylor tool-life equation, with inventory control.⏱ 9 min read

Topic-wise weightage in UPSC ESE (IES)

Expected question counts from previous-year paper analyses. Topics with an arrow already have a full chapter.

Topic	Prelims Q	Priority
Thermodynamics, Power Cycles and IC Engines	~Large share	Very high
Fluid Mechanics and Hydraulic Machines	~Large share	Very high
Heat Transfer, Refrigeration and Air Conditioning	~Large share	High
Machine Design, Mechanisms, Vibrations and Manufacturing	~Large share	Very high