# Fluid Mechanics Interview Questions

What is fluid mechanics?
What are the differences between liquids and gases?
What is the difference between laminar and turbulent flow?
What is Bernoulli’s principle?
What is the continuity equation?
What is the momentum equation?
What is the Navier-Stokes equation?
How do you calculate the Reynolds number?
What is the difference between incompressible and compressible flow?
How does viscosity affect fluid flow?
What are the different types of pumps and their applications?
What are the different types of valves and their applications?
What is the purpose of a hydraulic system?
What is the difference between open channel flow and closed channel flow?
What is the difference between a weir and an orifice?
What is the difference between a fluid and a solid?
What is surface tension?
What is capillary action?
What is the principle of flotation?
What is the Archimedes principle?
What is the difference between absolute pressure and gauge pressure?
What is the Pascal’s law?
What is the difference between static and dynamic pressure?
What is the difference between a streamline and a pathline?
What is the difference between a control volume and a control surface?
What is the principle of dimensional analysis?
What is the Reynolds transport theorem?
What is the mass conservation principle?
What is the energy conservation principle?
What is the difference between a uniform and a non-uniform flow?
What is the boundary layer?
What is the difference between a laminar and a turbulent boundary layer?
What is the boundary layer separation?
What is the wake of a bluff body?
What is the drag coefficient?
What is the lift coefficient?
What is the difference between a Newtonian and a non-Newtonian fluid?
What is the difference between a fluid and a non-Newtonian fluid?
What is the difference between a homogeneous and a heterogeneous fluid?
What is the difference between a compressible and an incompressible fluid?
What is the Mach number?
What is the difference between a subsonic and a supersonic flow?
What is the difference between a subcritical and a supercritical flow?
What is the difference between a converging and a diverging flow?
What is the difference between a centrifugal and a centripetal pump?
What is the difference between a positive displacement and a centrifugal pump?
What is the difference between a single-stage and a multi-stage pump?
What is the difference between a reciprocating and a rotary pump?
What is the difference between a gate and a globe valve?
What is the difference between a ball and a butterfly valve?
What is the difference between a needle and a diaphragm valve?
What is the difference between a pressure relief and a pressure reducing valve?
What is the difference between a check and a control valve?
What is the difference between a hydraulic and a pneumatic system?
What is the difference between a hydraulic and a mechanical system?
What is the difference between a centrifugal and a positive displacement compressor?
What is the difference between a reciprocating and a rotary compressor?
What is the difference between a single-stage and a multi-stage compressor?
What is the difference between an adiabatic and an isothermal compression process?
What is the difference between a nozzle and a diffuser?
What is the difference between a converging-diverging nozzle and a converging nozzle?
What is the difference between a converging-diverging diffuser and a converging diffuser?
What is the difference between a choked and a non-choked flow?
What is the difference between a laminar and a turbulent jet?
What is the difference between a submerged and a free jet?
What is the difference between a buoyant and a non-buoyant jet?
What is the difference between a steady and a pulsatile flow?
What is the difference between a laminar and a turbulent flow in a pipe?
What is the Hagen-Poiseuille equation?
What is the Prandtl number?
What is the Nusselt number?
What is the Reynolds number for flow in a pipe?
What is the Froude number?
What is the Weber number?
What is the Mach number for flow in a duct?
What is the boundary layer thickness?
What is the shear stress?
What is the drag force?
What is the lift force?
What is the Bernoulli equation?
What is the principle of conservation of mass?
What is the principle of conservation of momentum?
What is the principle of conservation of energy?
What is the Venturi meter?
What is the Pitot tube?
What is the difference between a centrifugal and an axial flow pump?
What is the difference between a propeller and a jet engine?
What is the difference between laminar and turbulent combustion?
What is the difference between natural and forced convection?
What is the difference between a laminar and a turbulent boundary layer in heat transfer?
What is the difference between a thermal and a hydrodynamic boundary layer?
What is the difference between a steady and a transient heat transfer?
What is the difference between a convective and a conductive heat transfer?
What is the difference between a Newton’s law of cooling and a Stefan-Boltzmann law of cooling?
What is the difference between a flat plate and a circular cylinder in heat transfer?
What is the difference between a single-phase and a two-phase flow?
What is the difference between a boiling and a condensing flow?
What is the difference between a dry and a wet bulb temperature?
What is the difference between a sensible and a latent heat?
What is the difference between a laminar and a turbulent thermal boundary layer?
What is the difference between a conductive and a convective thermal boundary layer?
What is the difference between a thermal and a hydrodynamic entrance length?
What is the difference between a heat exchanger and a reactor?
What is the difference between a parallel and a counter-flow heat exchanger?
What is the difference between a shell-and-tube and a plate heat exchanger?
What is the difference between a single-pass and a multi-pass heat exchanger?
What is the difference between a co-current and a cross-current flow in a heat exchanger?
What is the difference between a horizontal and a vertical flow in a heat exchanger?
What is the difference between a regenerative and a non-regenerative heat exchanger?
What is the difference between a single-effect and a multi-effect evaporator?
What is the difference between a falling film and a rising film evaporator?
What is the difference between a natural and a forced circulation evaporator?
What is the difference between a flash and a film evaporator?
What is the difference between a submerged and a spray dryer?
What is the difference between a batch and a continuous dryer?
What is the difference between a direct and an indirect dryer?
What is the difference between a fixed and a fluidized bed dryer?
What is the difference between a pneumatic and a mechanical dryer?
What is the difference between a thermosiphon and a forced-circulation distillation column?
What is the difference between a simple and a fractional distillation column?
What is the difference between a distillation and a rectification column?
What is the difference between a compressor and a fan?
What is the difference between a compressor and a pump?
What is the difference between a compressor and a turbine?
What is the difference between an open and a closed cycle gas turbine?
What is the difference between a two-stroke and a four-stroke engine?
What is the difference between a diesel and a gasoline engine?
What is the difference between an Otto cycle and a Diesel cycle engine?
What is the difference between a supercharger and a turbocharger?
What is the difference between a single-stage and a multi-stage compressor?
What is the difference between an isothermal and an adiabatic process in a compressor?
What is the difference between a positive displacement and a dynamic compressor?
What is the difference between a wet and a dry gas scrubber?
What is the difference between an electrostatic precipitator and a bag filter?
What is the difference between a cyclone separator and a gravity settler?
What is the difference between a plate and a packed distillation column?
What is the difference between a steam and a vacuum distillation?
What is the difference between a reactive and a non-reactive distillation?
What is the difference between a continuous and a batch distillation?
What is the difference between a condenser and a reboiler in a distillation column?
What is the difference between a static and a dynamic mixer?
What is the difference between a batch and a continuous mixer?
What is the difference between a high-shear and a low-shear mixer?
What is the difference between a homogeneous and a heterogeneous mixer?
What is the difference between a single and a double screw extruder?
What is the difference between a hot-melt and a cold-melt extruder?
What is the difference between a ram and a screw injection molding machine?
What is the difference between a thermoplastic and a thermoset injection molding?
What is the difference between a single-cavity and a multi-cavity mold?
What is the difference between a co-injection and an overmolding process?
What is the difference between a compression and an injection molding process?
What is the difference between a shear and a compression molding process?
What is the difference between a transfer and an injection molding process?
What is the difference between a casting and a molding process?
What is the difference between a sand and a die casting process?
What is the difference between a permanent and a semi-permanent mold?
What is the difference between a gravity and a pressure die casting process?
What is the difference between a shell and a investment casting process?
What is the difference between a lost-wax and a lost-foam casting process?
What is the difference between a hot and a cold forging process?
What is the difference between a drop and an upset forging process?
What is the difference between a closed and an open die forging process?
What is the difference between a swaging and a extrusion process?
What is the difference between a hydroforming and a stamping process?
What is the difference between a hot and a cold rolling process?
What is the difference between a flat and a profile rolling process?
What is the difference between a single and a multi-pass rolling process?
What is the difference between a continuous and a discrete rolling process?