Fluid mechanics

Fluid Kinematics , tailored for competitive exams like SSC JE , HPCL , and other PSUs —along with relevant previous year questions (PYQs) and their explanations. 💧 Fluid Kinematics –  ✅ What is Fluid Kinematics? Fluid kinematics is the study of fluid motion without considering the forces or energy that cause the motion. It focuses only on velocity, acceleration, and flow description using streamlines, pathlines, etc. 📘 Key Concepts in Fluid Kinematics 1. Types of Flow Flow Type Description Steady Flow Flow properties (velocity, pressure) do not change with time Unsteady Flow Flow properties vary with time Uniform Flow Properties are the same at every point in space Non-Uniform Flow Properties vary from point to point Laminar Flow Streamlined, orderly layers (Re < 2000) Turbulent Flow Random, chaotic flow (Re > 4000) Compressible Flow Density changes (gases) Incompressible Flow Density constant (liquids) 2. Flow Descripto...

   Dimensionless Numbers – a vital concept in fluid mechanics , heat transfer , and engineering modeling , especially important for competitive exams like SSC JE , RRB JE , GATE , IES , and various PSUs . 🔢 What Are Dimensionless Numbers? Dimensionless numbers are ratios of quantities that have no physical units. They help compare different physical effects and are essential for modeling, analysis, and similarity in engineering problems. They often arise from the non-dimensionalization of governing equations (like Navier-Stokes or energy equations) and reveal dominant physical forces in a system. 📦 Why Are They Important? Help simplify complex problems Used in model testing (e.g., wind tunnel, hydraulic models) Allow scaling from model to prototype Help determine regimes : laminar vs. turbulent, conduction vs. convection, etc. Appear in correlation equations (e.g., heat transfer coefficients) 📘 Common Dimensionless Numbers (With Physical Me...

 Surface Tension – MCQs for Competitive Exams  multiple-choice questions on Surface Tension, curated for exams like  Surface Tension – 50 MCQs for Competitive Exams multiple-choice questions on Surface Tension, curated for exams like SSC JE, RRB JE, State PSCs, and other engineering entrance/technical exams. Questions include conceptual, numerical, and application-based patterns with answers. 1.       1. Which unit is used to measure surface tension? ·         A. N/m² ·         B. N/m ·         C. N ·         D. m/N 👉 Answer: B 2.       2. Surface tension is due to: ·         A. Adhesion ·         B. Gravity ·         C. Cohesion ·         D. ...

🌊 Surface Tension: Concepts, Formulas & Exam Practice Questions Author: Vivek Kumar | Category: Engineering Physics | Target Exams: SSC JE, RRB JE, PSU, State PSC 🔍 What is Surface Tension? Surface tension is the property of a liquid surface that allows it to resist an external force due to cohesive nature of its molecules. It arises because molecules at the surface experience a net inward force , making the surface behave like a stretched elastic sheet. 🧠 Why It Matters in Competitive Exams? Surface tension is a commonly tested topic in engineering exams under physics or fluid mechanics. Questions typically involve: Conceptual understanding Formula-based numerical problems Application-based MCQs 📘 Key Concepts and Definitions Concept Description Cohesion Attraction between molecules of the same substance Adhesion Attraction between molecules of different substances Surface Tension (T or S) Force per unit length acting along the surface of a liquid...