Fluid Dynamics Practice Test Quiz

1. What is fluid dynamics?

• Fluid dynamics is primarily concerned with the temperature changes in solid materials.
• Fluid dynamics is the study of solid mechanics under stress conditions.
• Fluid dynamics only pertains to the flow of liquids in pipelines.
• Fluid dynamics is the branch of science that deals with the movement of gases and liquids.

2. Define fluid.

• A fluid is a solid that maintains its shape under stress.
• A fluid is a mixture of solids and gases that cannot flow.
• A fluid is a substance that does not flow or deform under stress.
• A fluid is a liquid, gas, or other material that flows and undergoes deformation continuously when an external force or shear stress is applied.

3. Can the fluid withstand shear force?

• Yes, fluids can withstand shear force and have significant shear resistance.
• Some fluids can withstand shear force but only in low viscosity conditions.
• Fluids can withstand shear force if they are under high pressure.
• No, fluids cannot withstand shear force and have zero shear modulus.

4. Which among the following use water as the fluid?

• Refrigerator
• Oven
• Microwave
• Air Conditioner

5. What is the disorderly mode of flow in liquids?

• Steady
• Uniform
• Laminar
• Turbulent

6. What is the layer of fluid that sticks to a solid surface called?

• Surface film
• Shear zone
• Boundary layer
• Fluidic layer

7. What energies does water contain?

• Magnetic energy and mechanical energy
• Thermal energy and electrical energy
• Chemical energy and nuclear energy
• Kinetic energy and potential energy

8. Can the forces acting on the aircraft be calculated using fluid dynamics?

• Yes
• Only under certain conditions
• It cannot be calculated
• No

9. In which type of fluid flow do particles move along a well-defined path?

• Laminar flow
• Transitional flow
• Turbulent flow
• Unsteady flow

10. Define irrotational flow.

• Irrotational flow is defined as the motion of fluid particles in a circular path.
• Irrotational flow is the type of flow where fluid particles do not rotate about their own axis when they flow along the flow lines.
• Irrotational flow occurs only when the fluid is incompressible.
• Irrotational flow means the fluid has no velocity.

11. Is a three-dimensional flow seen in liquids?

• No
• Only in solids
• Only in gases
• Yes

12. What are the three factors that affect liquid or gas flow patterns?

• Temperature, pressure, and density
• Color, shape, and texture
• Characteristics of the fluid, the shape of the solid surface, and flow speed
• Viscosity, gravity, and time

13. What are the characteristics of the fluid?

• Viscosity, compressibility, and density
• Velocity, mass, and friction
• Color, shape, and size
• Temperature, pressure, and volume

14. What is hydrodynamics?

• Hydrodynamics is the study of magnetic fields and currents.
• Hydrodynamics is the study of the flow of water and other fluids.
• Hydrodynamics is the study of optical properties of liquids.
• Hydrodynamics is the study of solid mechanics and rigidity.

15. Give Bernoulli’s Equation.

• \( P = \rho v + mg \)
• \( P + \frac{1}{2} \rho v^2 + \rho g z = \text{constant} \)
• \( P + \rho g z = \text{constant} \)
• \( \frac{1}{2} \rho v^2 = P + \rho g z \)

16. What is the principle of momentum in fluid flow?

• The principle of momentum leads to equations of fluid forces.
• The principle of momentum states that energy is conserved.
• The principle of momentum is only applicable in gaseous flows.
• The principle of momentum explains temperature changes in fluids.

17. What is the conservation of energy in fluid flow?

• The conservation of energy leads to the First Law of Thermodynamics.
• The conservation of energy leads to the principle of buoyancy.
• The conservation of energy leads to the Second Law of Thermodynamics.
• The conservation of energy leads to Newton`s Second Law of Motion.

18. What is the conservation of mass in fluid flow?

• The conservation of mass suggests that mass increases in fluid flow.
• The conservation of mass causes the fluid to evaporate.
• The conservation of mass leads to the continuity equation.
• The conservation of mass prevents fluids from flowing.

19. What is steady-state flow in fluid dynamics?

• Steady-state flow is when all fluid particles move at different speeds.
• Steady-state flow is the transition state between laminar and turbulent flow.
• Steady-state flow is when the fluid moves in a circular path only.
• Steady-state flow is the condition where the fluid properties at any single point in the system do not change over time.

20. What is the volumetric flow rate in fluid dynamics?

• \\( P = \\frac{F}{A} \\)
• \\( m˙ = \\frac{\\Delta V}{\\Delta t} \\)
• \\( F = ma \\)
• \\( W = Fd \\)

21. What is Pascal’s Law in fluid dynamics?

• Pascal’s Law states that the density of a fluid increases with temperature.
• Pascal’s Law states that fluid at rest exerts pressure equally in all directions.
• Pascal’s Law states that a change in pressure at any point in a confined fluid is transmitted undiminished to all points in the fluid and to the walls of the container.
• Pascal’s Law states that fluid flow always moves from high to low velocity.

22. What is the control volume concept in fluid dynamics?

• The control volume concept describes the behavior of solids under stress in mechanical systems.
• The control volume concept analyzes only gravitational forces acting on fluids in open systems.
• The control volume concept is used to analyze fluid flow problems by considering the masses and energies crossing the boundaries of a fixed region in space.
• The control volume concept focuses on the surface tensions of fluids at rest in a container.

23. What is the head loss in a pipe due to friction?

• Head loss is caused only by the inlet and outlet conditions of the pipe.
• Head loss due to friction is negligible in all types of fluid flow.
• Head loss is solely determined by the length of the pipe.
• Head loss due to friction is given by the Darcy-Weisbach equation: \\( h_f = f \\frac{L}{D} \\frac{v^2}{2g} \\)

24. What is the Reynolds number in fluid dynamics?

• The Reynolds number describes the color of the fluid in motion.
• The Reynolds number is a dimensionless quantity used to predict flow patterns in different fluid flow situations, given by \\( Re = \\frac{\\rho v D}{\\mu} \\).
• The Reynolds number indicates the density of the fluid only.
• The Reynolds number measures the temperature of the fluid flow.

25. What is the specific gravity of water?

• Four
• Three
• One
• Two

26. What is the specific gravity of mercury?

• 5.12
• 1.13
• 9.81
• 13.56

27. What is the dimension of specific gravity?

• M0L1T0
• M1L1T0
• M1L0T1
• M0L0T0

28. What is the head loss in a pipe if the flow rate is doubled?

• The head loss will be quadrupled if the flow rate is doubled.
• The head loss will be halved if the flow rate is doubled.
• The head loss will remain the same if the flow rate is doubled.
• The head loss will increase linearly if the flow rate is doubled.

29. What is the net force required to hold the upper plate in the position shown?

• \( F = 2\mu Q R^2 / h^2 [1 – (R_0 / R)^2] \)
• \( F = 4\mu Q R^2 / h^3 [1 – (R_0 / R)^2] \)
• \( F = \mu Q R^2 / h^4 [1 – (R_0 / R)^2] \)
• \( F = 3\mu Q R^2 / h^3 [1 – (R_0 / R)^2] \)

30. What is the pressure gradient in a narrow gap between parallel disks?

• The pressure gradient is directly proportional to the distance between the disks.
• The pressure gradient increases linearly with the radius.
• The pressure gradient is given by \\( dp/dr = -6\\mu Q / h^3 r^2 \\).
• The pressure gradient is zero between the disks.