Pipe Flow: Master Fluid Behavior in Piping Systems

Question 1

The friction factor in the Darcy-Weisbach equation:

Accepted Answer

Is a function of Reynolds number and pipe roughness

Answer

Is a dimensionless parameter that accounts for frictional losses in the pipe

Answer

Is a constant value that depends on pipe material only

Answer

Is directly proportional to the pipe diameter

Question 2

Which of the following is NOT a type of minor loss in pipe flow?

Accepted Answer

Laminar flow

Answer

Expansion

Answer

Contraction

Answer

Bend

Question 3

A Moody diagram is used to determine:

Accepted Answer

Friction factor for a given Reynolds number and relative roughness

Answer

Pressure drop in a pipe

Answer

Pipe network design

Answer

Fluid flow velocity

Question 4

A dimensionless parameter used to characterize pipe flow is:

Accepted Answer

Reynolds number

Answer

Froude number

Answer

Mach number

Answer

Strouhal number

Question 5

Pipe roughness affects the friction factor such that:

Accepted Answer

Rougher pipes have a higher friction factor

Answer

Rougher pipes have a lower friction factor

Answer

Pipe roughness has no effect on the friction factor

Answer

The effect depends on the Reynolds number

Question 6

In a pipe flow system, which of the following is NOT considered a minor loss?

Accepted Answer

Friction

Answer

Sudden expansion

Answer

Pipe bend

Answer

Sudden contraction

Question 7

The Moody diagram is commonly used to determine the friction factor (f) in the Darcy-Weisbach equation. Which of the following parameters is NOT utilized in the Moody diagram?

Accepted Answer

Flow velocity

Answer

Reynolds number

Answer

Pipe roughness

Answer

Pipe diameter

Question 8

In a pipe flow system consisting of a pump, pipes of varying diameters, and valves, the correct equation to calculate the total head loss (ht) is:

Accepted Answer

ht = hf + hm + hv

Answer

ht = hf - hm - hv

Answer

ht = hm - hf - hv

Answer

ht = hv - hm - hf

Question 9

The Darcy-Weisbach equation is primarily used to calculate the head loss in a pipe due to:

Accepted Answer

Friction

Answer

Minor losses

Answer

Elevation changes

Answer

Sudden expansion

Question 10

Which of the following is NOT considered a minor loss in a pipe flow system?

Accepted Answer

Pipe roughness

Answer

Sudden expansion

Answer

Valves

Answer

Bends

Question 11

The Moody diagram is a graphical representation that can be used to determine the friction factor for a pipe flow system. Which of the following parameters is NOT considered in the Moody diagram?

Accepted Answer

Pipe length

Answer

Reynolds number

Answer

Pipe roughness

Answer

Fluid viscosity

Question 12

A sudden expansion in a pipe flow system typically results in:

Accepted Answer

A decrease in pressure

Answer

An increase in pressure

Answer

No change in pressure

Answer

An increase in velocity

Question 13

Which of the following pipe materials typically has the lowest friction factor?

Accepted Answer

Plastic

Answer

Steel

Answer

Concrete

Answer

Copper

Question 14

A flow meter is primarily used to measure:

Accepted Answer

Flow rate

Answer

Pressure

Answer

Temperature

Answer

Fluid density

Question 15

Which of the following is categorized as a minor loss in pipe flow?

Accepted Answer

Sudden enlargement of the pipe diameter

Answer

Boundary layer formation

Answer

Laminar flow conditions

Answer

Turbulent flow conditions

Question 16

The Darcy friction factor is:

Accepted Answer

Dependent on both pipe roughness and Reynolds number

Answer

Constant for all pipes

Answer

Dependent solely on Reynolds number

Answer

Dependent solely on pipe roughness

Question 17

The flow regime within a pipe is primarily determined by:

Accepted Answer

Reynolds number

Answer

Temperature

Answer

Velocity

Answer

Pressure

Question 18

Which of the following devices can be employed to measure flow rate in a pipe?

Accepted Answer

Venturi meter

Answer

Thermometer

Answer

Pressure gauge

Answer

Strain gauge

Question 19

The equivalent length of a pipe bend is typically:

Accepted Answer

Expressed as a multiple of the pipe's diameter

Answer

Independent of the fluid properties

Answer

Dependent on the flow rate

Answer

Equal to the actual length of the bend

Question 20

Which of the following is NOT a practical application of pipe flow principles?

Accepted Answer

Electrical wiring

Answer

Water distribution systems

Answer

Oil pipelines

Answer

Gas transportation networks

Question 21

In the Darcy-Weisbach equation, what is the significance of the friction factor (f)?

Accepted Answer

It incorporates the effects of surface roughness and fluid properties on head loss.

Answer

It represents a constant value applicable to all fluids and pipe materials.

Answer

It is inversely proportional to the diameter of the pipe.

Question 22

What is the primary purpose of using a Moody diagram in pipe flow analysis?

Accepted Answer

To determine the friction factor (f) based on the Reynolds number and relative roughness.

Answer

To calculate the velocity of flow in a pipe.

Answer

To estimate the head loss due to a specific minor loss.

Question 23

In laminar flow through a pipe, the velocity profile is described as:

Accepted Answer

Parabolic

Answer

Uniform

Answer

Triangular

Answer

Linear

Question 24

Which factors influence the critical Reynolds number in pipe flow?

Accepted Answer

Fluid properties and pipe diameter

Answer

Pipe wall roughness

Answer

Pipe length only

Answer

Fluid temperature only

Question 25

When selecting an appropriate pipe material for a given application, which factors should be considered?

Accepted Answer

Pressure, temperature, corrosion resistance, and cost

Answer

Always choose the most expensive material.

Answer

Focus primarily on the pressure rating.

Question 26

Which methods can be used to measure flow rate in a pipe?

Accepted Answer

Venturi meter, orifice plate, or ultrasonic flowmeter

Answer

Pressure gauge only

Answer

Temperature sensor only