Engineering Management
Engineering management in the 1st Class Power Engineer exam tests how you plan, justify, schedule and control plant work so that reliability, cost and regulatory obligations are balanced. Questions often use maintenance records, project networks or outage data and ask for a defensible management decision.
Reliability and maintenance planning
- Availability = MTBF / (MTBF + MTTR). Define operating time, repair time and forced-outage time consistently before calculating.
- Preventive maintenance is interval-based; predictive or condition-based maintenance uses vibration, thermography, oil analysis and performance trends; run-to-failure is acceptable only for low-criticality, low-risk items.
- Reliability-centred maintenance starts from failure modes and consequences, not from supplier intervals. Criticality ranking determines spare-parts strategy and inspection frequency.
- A CMMS work-order backlog is a management indicator, not just a clerical record. Backlog age, repeat work orders and schedule compliance reveal whether planning is effective.
Cost, schedule and change control
- Critical Path Method: the critical path has zero total float; delaying any activity on it delays the project. PERT expected time = (optimistic + 4 x most likely + pessimistic) / 6.
- Life-cycle cost includes capital, energy, water and chemicals, maintenance, downtime and disposal. The lowest bid is not automatically the lowest life-cycle cost.
- Management of change (MOC) must cover temporary and permanent changes to equipment, procedures, chemicals and control logic. It triggers hazard review, drawing updates, training and code re-verification.
Worked example
A project has A = 5 days; B = 3 days after A; C = 4 days after A; D = 2 days after both B and C. Path A-B-D = 10 days; path A-C-D = 11 days. The critical path is A-C-D at 11 days. C has zero float; B has 1 day of float. A one-day delay in B does not delay completion, but a one-day delay in C does. Management attention and contingency should follow the critical path.
Traps that cost marks
Using MTBF alone without MTTR; comparing projects on capital cost only; accepting a contractor change without MOC; and reporting availability without stating whether planned outages are included. Also watch for KPIs that reward availability while ignoring heat rate or emissions, which can drive poor operating decisions.
Key points: availability depends on both failure frequency and repair speed; criticality should drive maintenance strategy; CPM float identifies schedule risk; life-cycle cost is the correct comparison; MOC is required for temporary as well as permanent changes.