Key takeaways
- Original Uncodemy revision notes in 9 units plus a practice question list.
- Worked examples on break-even, standard time, exponential smoothing, EOQ, Johnson's rule, the M/M/1 queue and PERT.
- This subject is very numerical and very scoring once the formulas are clear.
- Not official university notes. Check your own syllabus before revising.
- Free download after a short form.
About these Industrial Engineering and OR notes
These are original Uncodemy revision notes for Industrial Engineering and OR, written by the Uncodemy trainer team in a clean handwritten style. They follow the topics found in the common Indian B.Tech Mechanical syllabus. They are not official university notes, not a textbook and not a copy of any university's material. Unit names, order and depth differ between universities (AKTU, state technical universities and autonomous colleges all use their own scheme), so check your own syllabus and tick the units you need before you start.
Some universities teach Industrial Engineering and Operations Research as two papers. The notes cover both, so mark the units your paper includes.
Each unit has short definitions, key formulas in highlighted boxes, comparison tables, "remember" points and worked examples with the steps shown. A list of commonly asked practice questions closes the notes. These are practice questions based on common syllabus topics, not verified past papers.
What's inside the Industrial Engineering and OR notes
The PDF has 9 units plus a practice question list. Here is what each unit covers, so you can match it with your syllabus.
Unit 1: Productivity and Plant Layout
- Productivity: output over input and how to raise it.
- Plant layout types: product, process, fixed position and cellular layouts compared.
- Break-even analysis: fixed and variable cost and the break-even quantity.
Unit 2: Work Study
- Method study: SREDIM steps, process chart symbols and principles of motion economy.
- Work measurement: time study, rating, allowances and standard time.
Unit 3: Forecasting
- Qualitative and quantitative methods: Delphi, moving averages, exponential smoothing and regression.
- Forecast error: MAD and how the smoothing constant changes response.
Unit 4: Inventory Control
- EOQ model: ordering and holding cost and the economic order quantity.
- Selective inventory control: ABC, VED and related classifications.
Unit 5: Production Planning, Scheduling and Line Balancing
- Sequencing rules: SPT, EDD and other single machine rules.
- Johnson's rule: n jobs on two machines with makespan and idle time.
- Line balancing: cycle time, number of stations and balance efficiency.
Unit 6: Quality Control
- Control charts: X-bar, R, p and c charts and how limits are set.
- Acceptance sampling: the idea of sampling plans in short.
Unit 7: Linear Programming
- Formulation: writing objective and constraints from a word problem.
- Graphical and simplex methods: solving small LPs and writing the dual.
Unit 8: Transportation and Assignment
- Transportation problem: initial solution methods and optimality test.
- Assignment problem: Hungarian method.
Unit 9: Queuing Theory and PERT/CPM
- M/M/1 queue: utilisation, queue length and waiting time formulas.
- PERT and CPM: critical path, floats, expected time and project completion probability.
How to revise Industrial Engineering and OR
IE and OR is a method subject: each problem type has a fixed procedure.
- Make a procedure card for each problem type: EOQ, Johnson's rule, simplex, transportation, Hungarian method, PERT.
- Solve the worked examples first: they are short and cover almost every formula in the subject.
- Draw networks neatly: number events, mark durations and show the critical path clearly.
- Check units in queuing: keep arrival and service rates in the same time unit.
- Practise one LP per day: formulation is where most marks are lost.
Exam focus: high-weightage Industrial Engineering and OR topics
These topics are common across syllabi:
- EOQ and inventory models, ABC analysis.
- Forecasting by moving average and exponential smoothing.
- Johnson's rule and line balancing.
- Control charts (X-bar, R, p).
- LP by graphical and simplex methods, transportation and assignment.
- M/M/1 queue and PERT/CPM.
Typical numericals worked in the notes
- Break-even quantity with fixed cost Rs 1,00,000, price Rs 50 and variable cost Rs 30: 5000 units.
- Standard time from 2.0 min observed time, 110 percent rating and 15 percent allowance: about 2.53 min.
- EOQ for annual demand 10000 units, ordering cost Rs 200 and holding cost Rs 4.
- M/M/1 queue with 8 arrivals and 10 services per hour, and PERT expected time from three estimates.
Use the scientific calculator for EOQ square roots and queuing formulas. Keep units consistent: rates per hour, costs per year and times in the same unit throughout a problem.
A 7-day revision plan for Industrial Engineering and OR
Use this plan in the week before your exam, after you have studied the subject once in class. Spend about two to three hours a day.
- Day 1: Unit 1 (Productivity and Plant Layout), Unit 2 (Work Study). Read, close the PDF, then write the key formulas and definitions from memory.
- Day 2: Unit 3 (Forecasting), Unit 4 (Inventory Control). Read, close the PDF, then write the key formulas and definitions from memory.
- Day 3: Unit 5 (Production Planning, Scheduling and Line Balancing), Unit 6 (Quality Control). Read, close the PDF, then write the key formulas and definitions from memory.
- Day 4: Unit 7 (Linear Programming), Unit 8 (Transportation and Assignment). Read, close the PDF, then write the key formulas and definitions from memory.
- Day 5: Unit 9 (Queuing Theory and PERT/CPM). Read, close the PDF, then write the key formulas and definitions from memory.
- Day 6: redo every worked example in the notes without looking at the solution, then check each step.
- Day 7: attempt the practice question list at the end of the PDF in exam time, then go back to the units where you got stuck.
Who these notes are for
- B.Tech semester exams: third- and final-year Mechanical and Production students preparing for Industrial Engineering, Operations Research or Production Planning papers.
- GATE ME basics: industrial engineering is a scoring GATE ME area; EOQ, forecasting, queuing, PERT/CPM, Johnson's rule and LP are common. The notes cover basics and standard formulas; for GATE you still need a full question bank and previous papers from the official GATE site.
- Interviews: production, planning, supply chain and operations roles often ask about EOQ, line balancing, control charts and critical path.
- Diploma and lateral-entry students: the plain language and worked steps make the units easy to follow, but check which topics are in your own scheme.
How to use these notes with your textbook
These notes are short on purpose. They are meant for revision, not for learning Industrial Engineering and OR for the first time. Study each unit once from your class notes, a standard textbook or the matching NPTEL course, and then use the PDF to revise quickly. If a topic in your syllabus is missing from the notes, mark it in your syllabus copy and study it from your textbook. If your teacher uses a different method or notation, follow your teacher in the exam. You can also request notes for another subject through the Uncodemy handwritten notes request page.
Download Industrial Engineering and OR Handwritten Notes PDF
Industrial Engineering & OR Handwritten Notes PDF
The PDF carries the same content as this page in a clean, print-ready layout, so you can read it offline and keep it for revision.
8 pages · 338 KB · PDF · Updated 5 Nov 2026