Complete RGPV exam-oriented page covering fluid properties, density, pressure, viscosity, Newton's law of viscosity, Pascal's law, Bernoulli's equation, hydraulic machines, pumps, turbines and reciprocating pump.
Fluids important topics
Easy points for fast revision
A fluid is a substance which flows continuously when external force is applied. Examples are water, oil and air.
Density is mass per unit volume of fluid. Its unit is kg/m³. It is used to compare heaviness of different fluids.
Pressure is force acting per unit area. Its SI unit is Pascal or N/m².
Viscosity is the property of fluid which resists relative motion between layers. Honey has high viscosity and water has low viscosity.
Newton's law states that shear stress is directly proportional to velocity gradient. It is mainly used in lubrication and fluid flow analysis.
Pascal's law states that pressure applied at any point of a confined fluid is transmitted equally in all directions. It is used in hydraulic press, lift and brakes.
Bernoulli's theorem states that total energy of flowing incompressible fluid remains constant. It is used in venturimeter, aircraft wings and carburetor.
Reciprocating pump is a positive displacement pump in which piston moves back and forth inside a cylinder. It is suitable for high pressure applications.
Important numerical formulas
High chance RGPV exam questions
Repeated questions from previous RGPV papers
| Topic | Repeated Questions | Frequency | Priority |
|---|---|---|---|
| Bernoulli's Equation | Derivation, assumptions, applications and numerical problems | Very High | ★★★★★ |
| Pascal's Law | Statement, hydraulic press, hydraulic lift and applications | Very High | ★★★★★ |
| Fluid Properties | Density, pressure, viscosity and significance | Very High | ★★★★★ |
| Reciprocating Pump | Neat sketch, working principle and applications | High | ★★★★ |
| Hydraulic Machines | Classification and industrial applications | High | ★★★★ |
| Viscosity | Newton's law of viscosity and types of fluids | High | ★★★★ |
| Pumps | Centrifugal pump and reciprocating pump working | Medium | ★★★ |
| Turbines | Working principle and applications in power plants | Medium | ★★★ |
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Common student doubts
Bernoulli's equation, Pascal's law, fluid properties, reciprocating pump and hydraulic machines are most important.
Pressure, density, Bernoulli equation, fluid flow and viscosity numericals are important.
Reciprocating pump, pumps, turbines, hydraulic press and hydraulic lift diagrams are important.