General Studies and Engineering Aptitude (Paper I)
Paper I of the ESE prelims is the screening paper: it tests reasoning about current national and international issues alongside engineering aptitude - engineering ethics, project management, materials, ICT, energy and environment. Questions are factual and applied rather than deeply mathematical, so precise definitions, units and dated facts carry the marks.
Core areas
- Engineering ethics: public safety and welfare outrank client or employer interest; a conflict of interest must be disclosed, not merely avoided; whistle-blowing is defensible when internal channels have failed and harm is imminent.
- Project management: CPM is deterministic, PERT probabilistic; total float = LS − ES = LF − EF, and zero-float activities form the critical path.
- Materials: Young's modulus comes from the linear part of the stress–strain curve; ductility from percentage elongation; fatigue cracking occurs under cyclic stress below the yield strength.
- Energy and environment: distinguish primary from secondary energy, and load factor (average load/peak load) from capacity factor.
Worked example
A project has activity A of 3 days and B of 4 days running in parallel from the start, with C of 2 days following both. Project duration = max(3, 4) + 2 = 6 days. For A: ES = 0, EF = 3, LF = 4, so total float = 4 − 3 = 1 day. A has float and is non-critical; B has zero float and is critical. A delay beyond 1 day on A therefore extends the project.
Traps
Confusing free float with total float; assuming the longest single activity sets the duration when parallel paths govern; quoting stress in the wrong units; and answering current-affairs items from vague memory instead of a dated fact.