# Top Questions on Bernoulli’s Principle in Flow Meters

Test your knowledge of Bernoulli’s Principle and flow meters with our in-depth questions focused on fluid flow, pressure, and velocity in flow measurement systems.

## Bernoulli’s Principle in Flow Meters

Here this video provides you with detailed explanations for Bernoulli’s theorem questions and answers.

Question 1

### What does Bernoulli’s principle relate in a fluid flow?

A. Pressure and density

B. Velocity and pressure

C. Temperature and velocity

D. Flow rate and pressure

Velocity and pressure

Question 2

### How does Bernoulli’s principle apply in a Venturi meter?

A. It increases flow speed

B. It decreases pressure at the throat

C. It equalizes pressure

D. It measures temperature changes

It decreases pressure at the throat

Question 3

### Why is pressure lower at the throat of a Venturi meter?

A. Increased fluid velocity

B. Decreased fluid temperature

C. Reduced fluid density

D. Increased fluid viscosity

Increased fluid velocity

Question 4

A. Fluid is compressible

B. Fluid is at constant temperature

C. Fluid is incompressible

D. Fluid is turbulent

Fluid is incompressible

Question 5

### In which scenario does Bernoulli’s principle NOT apply?

A. Laminar flow

B. Turbulent flow

D. Incompressible flow

Turbulent flow

Question 6

### How does a Pitot tube uses Bernoulli’s principle?

A. It measures fluid temperature

B. It determines the fluid’s density

C. It measures stagnation pressure to find velocity

D. It decreases flow pressure

It measures stagnation pressure to find velocity

Question 7

### What is the role of pressure differential in a Venturi meter?

A. It indicates fluid temperature

B. It measures fluid viscosity

C. It determines the flow rate

D. It balances fluid velocity

It determines the flow rate

Question 8

### Which of the following is a key limitation of Bernoulli’s principle?

A. Assumes viscous fluid

B. Requires turbulent flow

C. Neglects friction losses

D. Assumes compressible fluid

Neglects friction losses

Question 9

### What happens to fluid velocity as pressure decreases, according to Bernoulli’s principle?

A. Velocity decreases

B. Velocity remains constant

C. Velocity increases

D. Velocity oscillates

Velocity increases

Question 10

### In an orifice plate flow meter, how does Bernoulli’s principle help measure flow rate?

A. It measures fluid temperature change

B. It detects fluid density variations

C. It relates pressure drop to flow velocity

D. It balances static pressure

It relates pressure drop to flow velocity

Question 11

### Why must the flow be steady for Bernoulli’s principle to be accurate?

A. To maintain constant temperature

B. To ensure consistent fluid properties

C. To avoid turbulence effects

D. To balance energy equations

To ensure consistent fluid properties

Question 12

### What is a key design consideration for using Bernoulli’s principle in flow meters?

A. Fluid color

B. Fluid density variations

C. Pipe material

D. Smooth, non-turbulent flow

Smooth, non-turbulent flow

Question 13

### Which of the following statements about Bernoulli’s principle is true?

A. It only applies to gases

B. It applies to compressible fluids

C. It assumes no energy loss

D. It neglects velocity variations

It assumes no energy loss

Question 14

### What is the effect of fluid density on Bernoulli’s principle?

A. Directly affects pressure drop

B. Has no impact on pressure

C. Increases temperature

D. Only affects flow direction

Directly affects pressure drop

Question 15

### Which factor must remain constant for Bernoulli’s equation to be valid?

A. Fluid viscosity

B. Fluid height

C. Fluid velocity

D. Fluid density

Fluid density

Question 16

### In which type of flow does Bernoulli’s principle most accurately predict pressure changes?

A. Compressible flow

B. Viscous flow

Question 17

### Why is the vena contracta important when applying Bernoulli’s theorem to an orifice plate?

A. It is the point of maximum fluid velocity and minimum density

B. It is the point of minimum fluid velocity and maximum pressure

C. It is the point of maximum fluid velocity and minimum pressure

D. It is the point of maximum fluid temperature and minimum pressure

It is the point of maximum fluid velocity and minimum pressure

Question 18

### Why is Bernoulli’s principle less accurate at high speeds?

A. Fluid density decreases

B. Pressure variations become negligible

C. Compressibility effects become significant

D. Temperature becomes a factor

Compressibility effects become significant

Question 19

### What happens to fluid velocity as the cross-sectional area decreases in a pipe, according to Bernoulli’s principle?

A. Velocity decreases

B. Velocity increases

C. Velocity remains constant

D. Velocity fluctuates

Velocity increases

Question 20

### How does the orifice plate in a flow meter create the conditions described by Bernoulli’s theorem?

A. By restricting the fluid flow to decrease velocity and increase pressure

B. By restricting the fluid temperature to increase velocity and reduce pressure

C. By restricting the fluid flow to increase velocity and reduce pressure

D. By restricting the fluid flow to increase velocity and reduce density

By restricting the fluid flow to increase velocity and reduce pressure

Question 21

### What does the term “stagnation pressure” refer to in Bernoulli’s principle?

A. Pressure due to fluid height

B. Static pressure at a point

C. Pressure where fluid velocity is zero

D. Minimum pressure in the flow

Pressure where fluid velocity is zero

Question 22

### How does Bernoulli’s principle affect the pressure on an airplane wing?

A. Increases pressure on top

B. Increases pressure on bottom

C. Equalizes pressure on both sides

D. Decreases pressure on the top

Decreases pressure on the top

Question 23

### How does fluid compressibility affect the application of Bernoulli’s principle in an orifice flow meter?

A. It increases fluid velocity

B. It causes energy losses

C. It enhances measurement accuracy

D. It has no effect on measurements

It causes energy losses

Question 24

### What is the impact of Reynolds number on the performance of an orifice flow meter?

A. It stabilizes temperature

B. It affects the flow coefficient

C. It has no impact

D. It only affects laminar flow

It affects the flow coefficient

Question 25

### How does Bernoulli’s theorem explain the pressure drop in an orifice flow meter?

A. Pressure increases due to velocity

B. Pressure drop is due to energy loss

C. Pressure drop is due to increased fluid velocity

D. Pressure remains constant across the orifice

Pressure drop is due to increased fluid velocity

Question 26

### What is the relationship between the cross-sectional area and velocity in an orifice flow meter according to Bernoulli’s theorem?

A. Velocity decreases as area decreases

B. Velocity increases as area decreases

C. Area and velocity are independent

D. Area and velocity both increase

Velocity increases as area decreases

Question 27

### Why is Bernoulli’s theorem essential in the design of orifice flow meters?

A. It predicts temperature changes

B. It provides a basis for pressure and velocity relationship

C. It assumes fluid is compressible

D. It ignores energy losses

It provides a basis for pressure and velocity relationship

Question 28

### According to Bernoulli’s theorem, what happens to pressure energy as fluid velocity increases in an orifice meter?

A. Pressure energy increases

B. Pressure energy decreases

C. Pressure energy remains constant

D. Pressure energy converts to thermal energy

Pressure energy decreases

Question 29

### What is the significance of the pressure drop measured in an orifice flow meter?

A. Indicates temperature rise

B. Reflects the energy loss

C. Directly relates to flow rate

D. Indicates a constant flow rate

Directly relates to flow rate

Question 30

### How does Bernoulli’s theorem justify the use of an orifice flow meter for fluid flow measurement?

A. It relates fluid density to temperature

B. It connects pressure drop to flow rate

C. It assumes constant temperature in the fluid

D. It stabilizes the fluid’s velocity

It connects pressure drop to flow rate

Question 31

### What assumption does Bernoulli’s theorem make about the flow in an orifice meter?

A. Flow is compressible

B. Flow is turbulent

C. Flow is incompressible and steady

Question 32

### According to Bernoulli’s theorem, what is the impact of fluid velocity on pressure when flowing through an orifice?

A. Pressure increases with velocity

B. Pressure decreases with velocity

C. Pressure remains unchanged

D. Pressure oscillates with velocity

Pressure decreases with velocity

Question 33

### Why does Bernoulli’s theorem assume negligible friction in an orifice flow meter?

A. To simplify flow calculations

B. To increase pressure drop

C. To focus on temperature changes

D. To account for fluid viscosity

To simplify flow calculations

Question 34

### How does Bernoulli’s theorem explain the flow rate change as fluid passes through an orifice?

A. Flow rate decreases with pressure

B. Flow rate increases with pressure

C. Flow rate is independent of pressure

D. Flow rate is proportional to the square root of pressure drop

Flow rate is proportional to the square root of pressure drop

Question 35

### What is the primary energy conversion that occurs in an orifice meter according to Bernoulli’s theorem?

A. Thermal to kinetic energy

B. Kinetic energy to pressure energy

C. Pressure energy to kinetic energy

D. Potential energy to thermal energy

Pressure energy to kinetic energy

Question 36

### How does Bernoulli’s theorem relate to the concept of head loss in an orifice flow meter?

A. Head loss is minimized by increasing velocity

B. Head loss is unrelated to Bernoulli’s theorem

C. Head loss is the energy loss due to pressure drop

D. Head loss increases fluid temperature

Head loss is the energy loss due to pressure drop

Question 37

### What does Bernoulli’s theorem suggest about the relationship between flow velocity and pressure in an orifice meter?

A. Pressure and velocity are directly proportional

B. Pressure remains constant as velocity changes

C. Velocity increases as pressure decreases

D. Pressure increases as velocity increases

Velocity increases as pressure decreases

Question 38

### Why is Bernoulli’s theorem particularly useful in understanding the operation of orifice flow meters?

A. It explains temperature fluctuations

B. It relates pressure, velocity, and flow rate

C. It assumes fluid compressibility

D. It only applies to laminar flow

It relates pressure, velocity, and flow rate

Question 39

### According to Bernoulli’s theorem, what happens to the kinetic energy of fluid as it flows through an orifice?

A. It decreases

B. It remains unchanged

C. It increases as pressure decreases

D. It converts into potential energy

It increases as pressure decreases

Question 40

### In which scenario would Bernoulli’s principle be least applicable?

A. Fluid flowing through a narrow pipe

B. Fluid flow with rapid expansion

C. Fluid moving in a steady, incompressible manner

D. Fluid flow in a slowly converging pipe