ASCE Hydraulics and Fluid Mechanics

Question 1

Which dimensionless number is used to distinguish between laminar and turbulent flow in a pipe?

Accepted Answer

Reynolds number

Answer

Froude number

Answer

Mach number

Answer

Weber number

Question 2

The Bernoulli equation assumes which of the following conditions?

Accepted Answer

Inviscid, incompressible, steady flow along a streamline

Answer

Viscous, compressible, unsteady flow along a streamline

Answer

Turbulent, compressible, steady flow between two cross-sections

Answer

Viscous, incompressible, unsteady flow at a point

Question 3

The hydraulic grade line (HGL) represents the sum of which two energy heads?

Accepted Answer

Pressure head and elevation head

Answer

Velocity head and elevation head

Answer

Pressure head and velocity head

Answer

Elevation head and friction head

Question 4

Which formula is most commonly used to calculate head loss due to friction in a full pipe under pressure?

Accepted Answer

Darcy-Weisbach equation

Answer

Manning's equation

Answer

Chezy's formula

Answer

Hazen-Williams equation

Question 5

In open channel flow, critical flow occurs when the Froude number equals:

Accepted Answer

1.0

Answer

0

Answer

0.5

Answer

2.0

Question 6

The continuity equation for steady, incompressible flow through a pipe states that:

Accepted Answer

The product of cross-sectional area and velocity is constant

Answer

Pressure is constant throughout the pipe

Answer

The product of velocity and pipe diameter is constant

Answer

The sum of head losses equals the total energy

Question 7

A pump adds energy to a fluid system. Which of the following correctly represents the pump head (hp) in the energy equation?

Accepted Answer

hp is added between the upstream and downstream energy terms

Answer

hp is subtracted from the upstream total head

Answer

hp is added to the downstream total head

Answer

hp equals the friction losses in the system