Fluid Dynamics Learning Quizzes for Mechanical Principles

Question 1

In laminar flow, fluid particles move in:

Accepted Answer

Straight, parallel lines

Answer

Random, swirling patterns

Answer

Turbulent, irregular paths

Answer

Circular, clockwise motions

Question 2

The SI unit of dynamic viscosity is:

Accepted Answer

Pascal-second (Pa·s)

Answer

Newton-second (N·s)

Answer

Poise (P)

Answer

Stokes (St)

Question 3

Which of the following is a dimensionless number used to characterize similarity in fluid flows?

Accepted Answer

Reynolds number

Answer

Prandtl number

Answer

Nusselt number

Answer

Grashof number

Question 4

A fluid with a higher viscosity will:

Accepted Answer

Flow less easily

Answer

Flow more easily

Answer

Have a higher density

Answer

Have a lower pressure

Question 5

Which device is used to measure fluid pressure?

Accepted Answer

Manometer

Answer

Pitot tube

Answer

Thermocouple

Answer

Strain gauge

Question 6

Laminar flow is characterized by:

Accepted Answer

Smooth, orderly flow

Answer

Turbulent, irregular flow

Answer

High pressure drop

Answer

Low pressure drop

Question 7

Bernoulli's equation expresses the relationship between which three parameters of a flowing fluid?

Accepted Answer

Pressure, velocity, and height

Answer

Volume, pressure, and temperature

Answer

Density, temperature, and velocity

Answer

Acceleration, displacement, and pressure

Question 8

The principle of mass conservation is expressed by which of the following equations?

Accepted Answer

Continuity equation

Answer

Navier-Stokes equations

Answer

Euler's equations

Answer

Bernoulli's equation

Question 9

Which of the following is NOT a type of fluid flow pattern?

Accepted Answer

Viscous flow

Answer

Laminar flow

Answer

Turbulent flow

Answer

Boundary layer flow

Question 10

Bernoulli's equation relates which quantities in a fluid system?

Accepted Answer

Pressure, velocity, and height

Answer

Temperature, density, and viscosity

Answer

Acceleration, force, and mass

Answer

Voltage, current, and resistance

Question 11

Which of the following fluids exhibits Newtonian behavior?

Accepted Answer

Water

Answer

Honey

Answer

Blood

Answer

Paint

Question 12

Which instrument is used to measure fluid velocity?

Accepted Answer

Pitot tube

Answer

Pressure gauge

Answer

Manometer

Answer

Thermometer

Question 13

What is the Venturi effect?

Accepted Answer

Pressure drop in a constricted section of a pipe, leading to increased fluid velocity

Answer

Increase in fluid density in a constricted section of a pipe

Answer

Decrease in fluid temperature in a constricted section of a pipe

Answer

Formation of vortices in a fluid

Question 14

What is the purpose of a diffuser in a fluid system?

Accepted Answer

To decrease fluid velocity

Answer

To increase fluid velocity

Answer

To increase fluid pressure

Answer

To decrease fluid temperature

Question 15

According to Bernoulli's equation, as the fluid velocity increases, what happens to the fluid pressure?

Accepted Answer

Decreases

Answer

Increases

Answer

Remains constant

Answer

Changes direction

Question 16

In a pipe flow system, which factor contributes most significantly to the head loss due to friction?

Accepted Answer

Pipe length

Answer

Flow rate

Answer

Pipe diameter

Answer

Fluid density

Question 17

Which of the following conditions can lead to turbulence in a fluid flow?

Accepted Answer

High fluid velocity

Answer

Large pipe diameter

Answer

Low fluid density

Answer

Smooth pipe walls

Question 18

Which of the following fluids typically exhibits the highest viscosity?

Accepted Answer

Honey

Answer

Water

Answer

Oil

Answer

Air

Question 19

In a fluid at rest, the pressure at any point is:

Accepted Answer

Equal in all directions

Answer

Zero

Answer

Atmospheric pressure

Answer

Proportional to the fluid depth

Question 20

To improve the efficiency of a pipe flow system, which measure is most effective?

Accepted Answer

Reducing friction losses

Answer

Using larger diameter pipes

Answer

Installing valves

Answer

Increasing the flow rate

Question 21

Bernoulli's equation is applicable to which type of fluid?

Accepted Answer

Incompressible fluids

Answer

Compressible fluids

Answer

Laminar flow

Answer

Turbulent flow

Question 22

Which of the following is NOT a fundamental fluid property?

Accepted Answer

Enthalpy

Answer

Compressibility

Answer

Viscosity

Answer

Density

Question 23

Bernoulli's equation is applicable to:

Accepted Answer

Incompressible, inviscid flows

Answer

Incompressible, viscous flows

Answer

Compressible, viscous flows

Answer

Compressible, inviscid flows

Question 24

The SI unit of dynamic viscosity is:

Accepted Answer

Pa·s

Answer

N/m^2

Answer

m^2/s

Answer

J/m^3

Question 25

As a fluid moves along a streamline, its velocity:

Accepted Answer

Remains constant

Answer

Decreases exponentially

Answer

Increases linearly

Answer

Increases exponentially

Question 26

The dimensionless parameter used to characterize the flow regime is:

Accepted Answer

Reynolds number

Answer

Mach number

Answer

Prandtl number

Answer

Froude number

Question 27

Laminar flow in a pipe is characterized by:

Accepted Answer

Low Reynolds number

Answer

Zero Reynolds number

Answer

Negative Reynolds number

Answer

High Reynolds number

Question 28

The **Venturi effect** describes:

Accepted Answer

Pressure decrease due to flow acceleration

Answer

Flow separation due to pressure increase

Answer

Flow attachment due to pressure decrease

Answer

Pressure increase due to flow acceleration

Question 29

The boundary layer in a fluid flow is:

Accepted Answer

A thin region near the solid surface where velocity gradients exist

Answer

A region of constant velocity near the solid surface

Answer

A region of zero velocity near the solid surface