IESL Part III study plan
IESL Part III · Give each week a clear focus.
8 weeks · About 7 hours per week
Agriculture and Plantation Engineering & Building Services Engineering
Map the Agriculture and Plantation Engineering syllabus into soil-water-plant, crop protection, and machinery sub-areas, then rank them by your current confidence
Derive and apply irrigation scheduling calculations (reference evapotranspiration, crop coefficient, net and gross application depth, interval) to three worked field scenarios
Summarize the Sri Lankan plantation crop cycle for tea, rubber, and coconut, listing the field operations and their timing
Explain the psychrometric chart and size a simple space-cooling coil load from given dry-bulb, wet-bulb, and airflow data
Compare vapour-compression, absorption, and evaporative cooling systems on efficiency, refrigerant, and application
Your checkpoint
A one-page irrigation-scheduling calculation sheet with three solved scenarios plus a labelled psychrometric sketch showing the coil process line, both checked against reference values
Agriculture and Plantation Engineering & Building Services Engineering
Analyze soil physical properties (texture, bulk density, field capacity, infiltration) and compute available water capacity for a given profile
Design a fertigation and drainage layout for a 2-hectare plot, stating pipe sizes, emitter spacing, and slope constraints
Calculate heating and cooling loads for a small building using a simplified degree-day or CLTD approach
Size ductwork and select a fan using pressure-loss and flow-rate relationships, and check noise criteria
Explain fire detection and suppression requirements for a multi-storey building, distinguishing sprinkler, hydrant, and detection zoning
Your checkpoint
A two-part design note: a fertigation/drainage layout with sizing calculations, and a cooling-load plus duct-sizing calculation for a single-zone building
IT and Communication Engineering & Electrical, Electronics & Telecommunication Engineering
Build a subnetting and routing worksheet covering VLSM, CIDR summarization, and static route selection for a three-router topology
Explain the TCP/IP transport and application layer behaviours (handshake, windowing, DNS resolution, HTTP request cycle) with a packet-flow narrative
Compare symmetric and asymmetric encryption, hashing, and digital signatures, and place TLS handshake steps in correct order
Solve three-phase balanced and unbalanced load problems, computing line and phase currents, power, and power factor correction
Select cable cross-section and protective device ratings for a given load using derating factors and voltage-drop limits
Your checkpoint
A closed-book 20-question self-test on subnetting, TCP/IP, and three-phase power scored and corrected, with a written error log naming each mistake's root cause
IT and Communication Engineering & Electrical, Electronics & Telecommunication Engineering
Design a small structured cabling and wireless LAN layout, justifying access point placement, channel plan, and PoE budget
Explain transformer operation, losses, and efficiency, and compute efficiency at given load fractions
Describe induction motor starting methods and select one for a specified load, justifying the choice
Draft an earthing and lightning-protection scheme for a building, citing resistance targets and bonding practice
Explain modulation and multiplexing basics (AM/FM, PCM, TDM/FDM) and compute bandwidth for a given channel
Your checkpoint
A network and electrical services package for one small building: cabling/WLAN plan with PoE budget, motor starting selection note, and earthing scheme, each with calculations
Mechanical Engineering & Chemical & Process Engineering
Analyze thermodynamic cycles (Rankine, Brayton, refrigeration) and compute cycle efficiency and COP from given states
Solve heat-transfer problems by conduction, convection, and radiation, and size a simple heat exchanger using LMTD
Compute stresses and deflections in beams and shafts under combined loading, and apply a fatigue or factor-of-safety check
Perform material and energy balances on a multi-unit process flowsheet with recycle, and identify the degrees of freedom
Select and size pumps, compressors, and control valves for a given duty, checking cavitation, surge, and rangeability
Your checkpoint
A worked problem set of six solved calculations (two thermodynamics, two heat transfer, one stress, one flowsheet balance) with assumptions and unit checks shown
Mechanical Engineering & Chemical & Process Engineering
Explain distillation, absorption, and drying operation, and compute stage or column requirements for a binary separation
Describe reaction kinetics and reactor sizing (batch, CSTR, PFR) for a simple order reaction, and compare conversion outcomes
Interpret a P&ID, tracing a control loop and identifying instrumentation tags, interlocks, and fail-safe positions
Apply process safety concepts (HAZOP, LOPA, relief sizing) to a described vessel and list credible deviations
Explain maintenance strategies and compute availability, MTBF, and MTTR for a given equipment history
Your checkpoint
A process design and safety review of one described unit: separation calculation, reactor sizing, annotated control-loop description, and a short HAZOP-style deviation table
Civil Engineering & Agriculture and Plantation Engineering
Design reinforced concrete elements (beam, slab, short column) to limit-state principles and check reinforcement ratios and deflection
Analyze a steel truss or frame and select a section against tension, compression, and buckling limits
Compute earth pressures and check slope stability and retaining-wall overturning and sliding for a given soil profile
Design pavement layers and a drainage culvert using traffic loading and hydraulic capacity checks
Review agricultural machinery selection and farm structure loads, linking tractor power requirements to implement draft
Your checkpoint
A structural and geotechnical design portfolio: one RC beam design, one steel member check, one retaining-wall stability check, and one culvert capacity calculation
Civil Engineering & Building Services Engineering & IT and Communication Engineering & Electrical, Electronics & Telecommunication Engineering & Mechanical Engineering & Chemical & Process Engineering & Agriculture and Plantation Engineering
Complete two full timed mock papers under exam conditions and score them by domain to expose remaining weak areas
Re-derive the ten formulas you most often misapply, writing each with its units and one worked example
Rewrite your error log into a one-page rapid-reference sheet per domain
Practice explaining design decisions aloud in short structured answers (assumption, calculation, check, conclusion)
Confirm exam-day logistics and set a revision schedule for the final 48 hours
Your checkpoint
Two scored mock papers with a domain-by-domain score table, a corrected error log, and seven one-page rapid-reference sheets