CEN 325: Exam II Review (copy)

TRUE or FALSE: The runoff coefficient will be higher for an asphalt surface that it is for a forest

• TRUE

What are the main assumptions of the Rational Formula?

• Short t_c

• small watersheds

• the rainfall has a constant intensity, i, for a duration of time equal to the time of concentration of the watershed

An HGL is coincident with the liquid surface of a piezometer while an EGL is coincident with the liquid surface in a stagnation tube.

TRUE or FALSE: A Froude number less than 1 indicates supercritical flow

• FALSE

TRUE or FALSE: A Reynolds number greater than 4000 would represent turbulent flow conditions.

• TRUE

If a pipe i hydraulically long, we can assume that which type of head losses dominate?

• Pipe frictional losses

Which of the following is always true for the pipe networks shown in figure?

• Q₃=Q₂+Q₄

• Q₂=Q₄

• Q₁=Q₂+Q₄

Which is always true for the pipe network shown in the attached figure

• Q₁=Q₂

• Q₂=Q₃

What is always true for the attached figure?

• Q_A=Q_B+Q_C

What is the name of what happens when the absolute pressure at the pump inlet decreases below the vapor pressure of the fluid?

• Cavitation

TRUE or FALSE: Changing the pump speed will not change the pump characteristics curve

• False

For the pump curve below, what is the approximate discharge?

0.27 m³/s

For the attached pump curve, what is the cutoff head?

59m

TRUE or FALSE: Critical flow occurs when specific energy is minimum for a given discharge

• True

Subcritical is generally associated with slow and deep, while supercritical is associated with fast and shallow

TRUE or FALSE: There can only be one depth for a given specific energy

• False