Viscosity & Flow in Pipes Quiz

What is viscosity defined as in flowing liquids?

There are TWO correct answers.

• Quantity that describes a fluid's resistance to flow

• Force exerted by the wall

• Internal friction of the fluid

• Pressure exerted by the fluid

What is the SI unit for viscosity?

• Pa.s (pascal second)

• N (newton)

• m/s (meters per second)

• kg/m3 (kilograms per cubic meter)

When is the flow considered laminar according to Reynolds number?

• Reynolds number between 2000 and 4000

• Reynolds number greater than 4000

• Reynolds number more than 2000

• Reynolds number less than 2000

What is the main category of head loss in pipes associated with energy loss per length of pipe?

• Turbulence losses

• Friction losses

• Minor losses

• Major losses

What is the most common equation used to calculate major head losses in pipes?

• Einstein's equation

• Newton's equation

• Darcy’s equation

• Bernoulli's equation

What type of loss occurs when a pipe changes its diameter?

• Loss of head

• Loss of pressure

• Loss of velocity

• Loss of temperature

What is the coefficient times the flow velocity head used to evaluate the loss of head for each valve or fitting?

• D

• f

• k

• L

What is the best way to minimize the loss of head in a pipeline?

You can choose more than one.

• Use the shortest possible pipe

• Use the largest possible pipe diameter

• Use the highest possible liquid temperature

• Use unnecessary valves

What is the no-slip condition in fluid flow?

• Fluid flows with zero viscosity

• Fluid speed is zero at the wall

• Fluid speed is maximum at the wall

• Fluid has no friction

What is the definition of a pipe in fluid mechanics?

• A device to increase pressure

• A closed conduit of circular section

• An open channel

• A type of pump