Key takeaways
- Original Uncodemy revision notes in 9 units plus a practice question list.
- Worked examples on hydrostatic force on a gate, a venturimeter and Darcy head loss.
- Bernoulli, pipe losses and turbine comparisons are high-scoring in most papers.
- Not official university notes. Check your own syllabus; some universities teach machinery as a separate paper.
- Free download after a short form.
About these Fluid Mechanics and Machinery notes
These are original Uncodemy revision notes for Fluid Mechanics and Machinery, 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.
The notes cover both the fluid mechanics part and the hydraulic machines part, so they suit universities that teach them together as well as those that split them into two papers.
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 Fluid Mechanics and Machinery 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: Fluid Properties
- Basic properties: density, specific weight, viscosity, surface tension and capillarity.
- Types of fluids: ideal, real, Newtonian and non-Newtonian fluids.
Unit 2: Fluid Statics
- Pressure measurement: Pascal's law and manometers.
- Hydrostatic force: total pressure and centre of pressure on submerged plane surfaces.
- Buoyancy and stability: metacentric height and stability of floating bodies.
Unit 3: Fluid Kinematics
- Types of flow: steady, uniform, laminar, turbulent and the continuity equation.
- Stream function and velocity potential: their meaning and why their lines are orthogonal.
Unit 4: Fluid Dynamics
- Euler and Bernoulli equations: derivation, assumptions and use.
- Flow measuring devices: venturimeter, orifice meter and pitot tube.
- Momentum equation: forces on pipe bends and jets.
Unit 5: Viscous (Laminar) Flow
- Hagen-Poiseuille flow: laminar flow in pipes and the velocity profile.
- Flow between plates: laminar flow between parallel plates in short.
Unit 6: Flow Through Pipes
- Major and minor losses: Darcy-Weisbach friction loss and losses at bends, entry and exit.
- Pipes in series and parallel: equivalent pipe and flow sharing.
Unit 7: Boundary Layer and Dimensional Analysis
- Boundary layer: boundary layer thickness, separation and drag.
- Dimensional analysis: Buckingham pi theorem and model laws.
- Dimensionless numbers: Reynolds, Froude, Euler, Weber and Mach numbers and where each matters.
Unit 8: Hydraulic Turbines
- Impulse and reaction turbines: Pelton, Francis and Kaplan turbines compared.
- Performance: efficiencies, specific speed and draft tube.
Unit 9: Pumps
- Centrifugal pump: heads, efficiencies, priming, cavitation and NPSH.
- Reciprocating pump: slip, indicator diagram and air vessels.
How to revise Fluid Mechanics and Machinery
This subject mixes derivations with numericals. Plan your revision so both get time.
- Make a derivation list: Bernoulli from Euler, venturimeter discharge, Hagen-Poiseuille and capillary rise. Write each once a week.
- Group the formulas: keep statics, pipe flow and machines formulas on separate pages.
- Watch the units: convert manometer readings to metres of water and keep pressures in pascals.
- Compare machines in tables: Pelton versus Francis versus Kaplan, and centrifugal versus reciprocating pumps.
- Redo the worked numericals: gate force, venturimeter and Darcy loss examples are short and build confidence.
Exam focus: high-weightage Fluid Mechanics and Machinery topics
These areas appear often in common syllabi:
- Manometers, hydrostatic force and centre of pressure.
- Metacentric height and stability of floating bodies.
- Bernoulli's equation, venturimeter and orifice meter.
- Laminar flow (Hagen-Poiseuille) and Darcy-Weisbach losses.
- Dimensional analysis and model laws.
- Turbine comparisons, specific speed, cavitation and NPSH.
Typical numericals worked in the notes
- A vertical gate 2 m wide and 3 m deep with the top edge at the water surface: force and its location.
- A 200 mm by 100 mm venturimeter with a mercury manometer reading: find the discharge.
- Water at 2 m/s in a 100 mm pipe 500 m long with f = 0.02: the head loss works out to about 20.4 m.
Check flow regime with the Reynolds number calculator and pump sizing with the pump power calculator.
A 7-day revision plan for Fluid Mechanics and Machinery
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 (Fluid Properties), Unit 2 (Fluid Statics). Read, close the PDF, then write the key formulas and definitions from memory.
- Day 2: Unit 3 (Fluid Kinematics), Unit 4 (Fluid Dynamics). Read, close the PDF, then write the key formulas and definitions from memory.
- Day 3: Unit 5 (Viscous (Laminar) Flow), Unit 6 (Flow Through Pipes). Read, close the PDF, then write the key formulas and definitions from memory.
- Day 4: Unit 7 (Boundary Layer and Dimensional Analysis), Unit 8 (Hydraulic Turbines). Read, close the PDF, then write the key formulas and definitions from memory.
- Day 5: Unit 9 (Pumps). 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: second-year Mechanical (and Civil) students preparing for Fluid Mechanics, Hydraulics or Fluid Machinery papers.
- GATE ME basics: fluid mechanics is a regular GATE ME topic; manometers, Bernoulli, laminar flow, pipe losses and boundary layer 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: core, HVAC and plant roles often ask about Bernoulli's equation, Reynolds number, cavitation and pump selection.
- 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 Fluid Mechanics and Machinery 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 Fluid Mechanics and Machinery Handwritten Notes PDF
Fluid Mechanics & Machinery 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 · 296 KB · PDF · Updated 5 Nov 2026