Physics

Fluid Mechanics and Hydraulics

376 Questions

Fluid mechanics and hydraulics questions address the principles of fluid flow, pipe resistance, and open channel dynamics. The topics include Bernoulli equation, Navier-Stokes equation, and hydrograph calculations. These concepts are crucial for civil and mechanical engineering competitive examinations.

Fluid flow equationsOpen channel flowPipe frictionHydraulic jumpHydrograph analysis

Fluid Mechanics and Hydraulics Questions

Multiple choice

2L of NS over 20 hours. Flow rate?

  1. 100 ml/hr

  2. 100 gtts/min

  3. 150 ml/hr

  4. 200 ml/hr
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

To find the flow rate in ml/hr, divide the total volume by the total time. 2000 ml / 20 hours = 100 ml/hr.

Multiple choice

Viscosity is a measure of a fluid's?

  1. resistance to flow

  2. adhesive forces

  3. average kinetic NRG

  4. buoyancy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Viscosity is a fluid's resistance to flowing; high viscosity means it flows slowly, like honey.

Multiple choice

Which property of a fluid describes its resistance to flow?

  1. Density

  2. Viscosity

  3. Surface tension

  4. Compressibility
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Viscosity is the property of a fluid that describes its resistance to flow. It is a measure of the internal friction between fluid particles.

Multiple choice

The Darcy-Weisbach equation is used to calculate:

  1. Pressure drop in a pipe.

  2. Flow rate in a pipe.

  3. Head loss in a pipe.

  4. Velocity of a fluid in a pipe.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Darcy-Weisbach equation is used to calculate the pressure drop in a pipe due to friction.

Multiple choice

The Moody diagram is a graphical representation of:

  1. Friction factor for pipe flow.

  2. Reynolds number for pipe flow.

  3. Pressure drop for pipe flow.

  4. Flow rate for pipe flow.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Moody diagram is a graphical representation of the friction factor for pipe flow as a function of the Reynolds number and relative roughness.

Multiple choice

In fluid mechanics, what is the relationship between pressure, velocity, and elevation in a flowing fluid?

  1. Bernoulli's Equation

  2. Navier-Stokes Equations

  3. Darcy-Weisbach Equation

  4. Hagen-Poiseuille Equation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bernoulli's Equation describes the relationship between pressure, velocity, and elevation in a flowing fluid, expressing the principle of conservation of energy.

Multiple choice

Which quantity represents the resistance of a fluid to flow?

  1. Viscosity

  2. Density

  3. Pressure

  4. Temperature
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Viscosity is the property of a fluid that opposes the relative motion between its adjacent layers, causing internal friction.

Multiple choice

The rate of flow of a fluid through a pipe is determined by:

  1. Volumetric Flow Rate

  2. Mass Flow Rate

  3. Reynolds Number

  4. Froude Number
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Volumetric flow rate is the volume of fluid passing through a given cross-sectional area per unit time.

Multiple choice

The equation that describes the conservation of mass for an incompressible fluid is:

  1. Continuity Equation

  2. Navier-Stokes Equations

  3. Euler Equations

  4. Bernoulli's Equation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The continuity equation states that the mass of fluid entering a control volume must equal the mass leaving the control volume.

Multiple choice

The equations that govern the motion of a viscous fluid are known as:

  1. Navier-Stokes Equations

  2. Euler Equations

  3. Bernoulli's Equation

  4. Darcy-Weisbach Equation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Navier-Stokes equations are a set of partial differential equations that describe the motion of a viscous fluid.

Multiple choice

The phenomenon where a fluid flows around an object with minimal separation is called:

  1. Laminar Flow

  2. Turbulent Flow

  3. Boundary Layer Flow

  4. Potential Flow
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Potential flow is a type of flow where the fluid particles move along streamlines without any separation.

Multiple choice

The phenomenon where a fluid flows past a bluff body and creates a region of recirculating flow is known as:

  1. Laminar Flow

  2. Turbulent Flow

  3. Boundary Layer Flow

  4. Vortex Shedding
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Vortex shedding is a phenomenon where vortices are shed from the surface of a bluff body as it moves through a fluid.