# Fluid Mechanics Viva Questions

• What is fluid mechanics?
• What is a fluid?
• What is the difference between a liquid and a gas?
• What are the properties of a fluid?
• What is viscosity?
• What is compressibility?
• What is bulk modulus?
• What is specific gravity?
• What is pressure?
• What is Pascal’s law?
• What is Archimedes’ principle?
• What is Bernoulli’s equation?
• What is the continuity equation?
• What is Reynolds number?
• What is the difference between laminar and turbulent flow?
• What is the boundary layer?
• What is the Navier-Stokes equation?
• What is the Euler equation?
• What is the difference between a streamline and a pathline?
• What is the concept of flow rate?
• What is the difference between a control volume and a control surface?
• What is a fluid particle?
• What is a stagnation point?
• What is the venturi effect?
• What is the Pitot tube?
• What is a hydraulic jump?
• What is cavitation?
• What is the difference between internal and external flow?
• What is the no-slip condition?
• What is a boundary condition?
• What is the difference between a streamline and a streakline?
• What is the difference between a fluid and a solid?
• What is a free surface?
• What is a meniscus?
• What is capillary action?
• What is the Laplace equation?
• What is the Laplace-Young equation?
• What is the Laplace-Young-Poisson equation?
• What is the equation of state?
• What is the ideal gas law?
• What is the compressible flow equation?
• What is a shock wave?
• What is the Mach number?
• What is the sound speed in a fluid?
• What is the critical Mach number?
• What is the choking condition?
• What is the isentropic flow equation?
• What is the mass flow rate?
• What is the momentum equation?
• What is the Bernoulli equation for incompressible flow?
• What is the energy equation?
• What is the power equation?
• What is the pump head?
• What is the efficiency of a pump?
• What is the lift force?
• What is the drag force?
• What is the buoyancy force?
• What is the weight of a fluid?
• What is the center of pressure?
• What is the Magnus effect?
• What is the boundary layer thickness?
• What is the boundary layer separation?
• What is the effect of turbulence on drag?
• What is the effect of roughness on drag?
• What is the effect of viscosity on drag?
• What is the effect of pressure on drag?
• What is the effect of Reynolds number on drag?
• What is the effect of Mach number on drag?
• What is the effect of angle of attack on lift and drag?
• What is the lift-to-drag ratio?
• What is the lift coefficient?
• What is the drag coefficient?
• What is the stall condition?
• What is the sweep angle?
• What is the aspect ratio?
• What is the induced drag?
• What is the parasitic drag?
• What is the interference drag?
• What is the thrust force?
• What is the propulsive efficiency?
• What is the specific thrust?
• What is the bypass ratio?
• What is the fan pressure ratio?
• What is the turbine inlet temperature?
• What is the exhaust gas temperature?
• What is the specific fuel consumption?
• What is the thrust specific fuel consumption?
• What is the propeller efficiency?
• What is the propeller pitch?
• What is the blade angle?
• What is the blade area?
• What is the blade aspect ratio?
• What is the blade lift coefficient?
• What is the blade drag coefficient?
• What is the blade efficiency?
• What is the blade tip speed?
• What is the slipstream?
• What is laminar sublayer?
• What is boundary layer displacement thickness?
• What is a Prandtl boundary layer?
• What is a Blasius boundary layer?
• What is a Falkner-Skan boundary layer?
• What is the Karman-Tsien compressibility correction factor?
• What is the Fanno flow?
• What is the Rayleigh flow?
• What is the shock polar?
• What is the method of characteristics?
• What is the method of finite differences?
• What is the method of finite volumes?
• What is the method of finite elements?
• What is the difference between Eulerian and Lagrangian approaches?
• What is the difference between explicit and implicit methods?
• What is the difference between steady and transient simulations?
• What is the difference between 2D and 3D simulations?
• What is the difference between structured and unstructured grids?
• What is the difference between uniform and non-uniform grids?
• What is the difference between Cartesian and curvilinear grids?
• What is the difference between structured and unstructured meshes?
• What is the difference between tetrahedral and hexahedral elements?
• What is the difference between triangular and quadrilateral elements?
• What is the difference between linear and quadratic elements?
• What is the difference between explicit and implicit time integration?
• What is the difference between first-order and second-order accuracy?
• What is the difference between upwind and central differencing?
• What is the difference between high-resolution and TVD schemes?
• What is the difference between steady-state and transient heat transfer?
• What is conduction heat transfer?
• What is convection heat transfer?
• What is radiation heat transfer?
• What is the Fourier law of heat conduction?
• What is the Newton law of cooling?
• What is the Stefan-Boltzmann law?
• What is the emissivity of a surface?
• What is the absorption coefficient of a medium?
• What is the scattering coefficient of a medium?
• What is the Planck’s law of blackbody radiation?
• What is the Wien’s displacement law?
• What is the Kirchhoff’s law of thermal radiation?
• What is the heat transfer coefficient?
• What is the Nusselt number?
• What is the Prandtl number?
• What is the Grashof number?
• What is the Reynolds analogy?
• What is the Colburn analogy?
• What is the mass transfer coefficient?
• What is the Sherwood number?
• What is the Schmidt number?
• What is the Lewis number?
• What is the Fick’s law of diffusion?