First Test Spring 2013 Hydraulic Engineering

Full Name ______

Note: cop outs give half credit

Closed book, one page of notes one side in your own hand writing.

Casio: All fx-115 models. Any Casio calculator must contain fx-115 in its model name. Examples of acceptable Casio fx-115 models include but are not limited to the following:

  • fx-115 MS
  • fx-115 MS Plus
  • fx-115 MS SR
  • fx-115 ES
  • fx-115 ES Plus

Hewlett Packard: The HP 33s and HP 35s models, but no others.
Texas Instruments: All TI-30X and TI-36X models. Any Texas Instruments calculator must contain either TI-30X or TI-36X in its model name. Examples of acceptable TI-30X and TI-36X models include but are not limited to the following:

  • TI-30Xa
  • TI-30Xa SOLAR
  • TI-30Xa SE
  • TI-30XS Multiview
  • TI-30X IIB
  • TI-30X IIS
  • TI-36X II
  • TI-36X SOLAR
  • TI-36X Pro

By my signature below, I hereby swear that I have neither received aid from any other student, nor have I given aid to any other student on this exam.Moreover, I swear that I have not committed any form of academic dishonesty and have maintained ethical integrity in accordance with the UTEP Handbook of Operating Procedures, the UTEP Civil Engineering Honor Code, and the ASCE Code of Ethics.

Signature: ______

By my signature below, I swear that I have not witnessed any other student commit any form of academic dishonesty with regard to this exam.

Signature: ______

Several problems refer to this information:

Walt has started to wonder what is happening. Prices are falling in Albuquerque and quality has improved. The people on the street talk of new crystal with an orange tintand a density of 780 kg/m3. His competition in El Paso (reputed to be a bald professor with a degree in Chemical Engineering), frustrated by a poor football season, thinks that his school needs to be known for something of high quality. To h--- with Walt’s fat brother in law, and shoplifting sister in law: cook, sell, make money, ruin some lives – what’s not to like?

With a normaldepth of only 1.1 ft, a bottom width of 21 ft, and a slope of 0.5%, with sidewalls of 4H:1V, the concrete lined portion ofthe Rio Grande is easy to cross, opening things up to southern exports. Not to be outdone, Walt has been busy upgrading his RV-laboratory with the best equipment including new 15 mm diameter copper tubing, and Pyrex 3 liter flasks. The temperature inside the lab in now controlled at 68.4 degrees Fahrenheit and relative humidity is kept at 20%. New air enters the RV at a velocity of 3 ft/s and a discharge of 2 cfs. It has a new 6-liter fuel injected engine with a 40 gallon gas tank.

  1. (8) In hopes of catching up to the competition, Walt sets up a new flow system in his RV laboratory. He asks his sidekick (Jesse or is it you?) to:

a)(4) Label the fastest flow system below

b)(4) Label the slowest flow system below

  1. (20) Find the friction factor in Walt’s new tubing if the water flow rate is 10 liters a minute.

a)(5) What is relative roughness?

b)(5) Is the flow fully turbulent? Why or why not?

c)(5) What is the Reynolds Number?

d)(5) What is the friction factor?

  1. (4) Label the wetting and nonwetting surface of these two droplets on the RV counter
  1. (4) The force, T is proportional to: ( pick two of the choices below)
  2. the viscosity
  3. the velocity gradient (dV/dy)
  4. the surface tension
  5. the velocity squared
  6. the velocity

  1. The concrete lined section of the Rio Grande, when flowing at a depth of 1.1 ft, has a
  2. (4) Flow velocity =
  3. (4) Hydraulic radius =
  4. (4) A discharge =
  5. (4) A Froude number =
    e. (4) is a A, M, H, S section?(letter only, you don’t have the information for the number), Why?
  1. (4) The figure is an example of a
  2. Venturi
  3. Broad crested weir
  4. Parshall flume
  5. Darcy-Weisbach flume
  6. cop out

  1. (12)The velocity in the tube is 2 m/s and the pressure in the center is 4 kPa. Measured from the center of the pipe, how far does the water rise in:
    a) (6) The piezometer?
    b) (6) The Pitot tube?

  1. (4) How does the critical depth change with discharge in a given channel section?
    a) depends only on the section characteristics, independent of flow rate
    b) critical depth increases with increasing flow
    c) critical depth decreases with increasing flow
    d) (cop out) I have no idea and will choose to get half the points in the problem for free rather than guessing

  1. (6) The area between the control point and the hydraulic jump has what profile? yo1 and yo2 represent the normal depths at the marked locations. The critical depth is shown with the dashed line.
    Explain your answer (both the number and the letter):

    10. (6) After not studying for your Fundamentals of Engineering Exam, which would have helped ensure your future as an engineer, you fail it and go to work as an assistant to Walton and start carrying loads across the Rio Grande - you have the same future as Jesse! Suddenly you trip and spill the large perfectly shaped orange crystals in the river. Having fast reactions you quickly reach for them:

a)On the surface of the river, why?

b)Scraping along the concrete on the bottom of the river, why?

c)(cop out)

  1. (20) All his life Walt has had visions of grander that have never materialized. When he supplies crystal to the whole world, this will be in his lab. Ignore minor losses

a)(6) Initially the energy equation looks like:

b)(6) Solving the energy equation for the velocity (without numbers but eliminating zero terms):

c)(6) I plug in the numbers and get a velocity of:

V =