Question 1

From which of the following conditions do structural forces originate?
1. Point loads
2. Uniform loads
3. Compression
4. Non-uniformly distributed loads
5. Tension
6. Moments

A)1, 2
B)1, 3, 4
C)2, 4 ,5, 6
D)1, 2, 4, 6

1, 2, 4, 6

Accepted Answer

Structural forces originate from the following conditions:
- Point loads
- Uniform loads
- Non-uniformly distributed loads
- Moments
Structural forces, or loads on a structure, result in stresses on the structural material. There are two types of material stress: compression and tension.

Question 2

What is the degree of saturation of a 600 cm³ soil sample given the following values from its three-phase diagram? Volume of air: 100 cm³; volume of solids: 320 cm³. A)30% B)64.3% C)87.5% D)Not enough information provided

Accepted Answer

The degree of saturation of a 600 cm³ soil sample with the given volumetric values is 64.3%. Solution: Use the following equation to determine the degree of saturation, S. S = volume of water / volume of voids = V_w / V_v Given V_v = total volume - volume of solids V_v = 600 - 320 = 280 cm³ And V_w = V_T - V_V - V_S V_W = 600 - 100 - 320 = 180 cm³ Therefore S = V_W / V_V = (180 cm³ / 280 cm³) x 100 S = 64.3%

Question 3

Which of the following hammers is not commonly used for conducting Standard Penetration Tests (SPTs)?&#10;A)Split-spoon&#10;B)Automatic&#10;C)Donut&#10;D)Safety

Accepted Answer

A split-spoon is not a hammer used for conducting SPTs. A split spoon is a sampling tube, approximately 20 - 36-inches long, that is placed inside a drill rod to collect soil samples. Automatic, donut, and safety hammers are used to drive the drill rods into the soil.

Question 4

Which of the following elements are typically included on the Erosion and Sediment Control Plan of a construction site?&#10;A)Site drawing with existing and proposed conditions&#10;B)Standard details of each erosion and sediment control best management plan (BMP) proposed for use&#10;C)BMP inspection and maintenance schedule&#10;D)All of the above.

Accepted Answer

All of the elements listed are typically included on an Erosion and Sediment Control Plan. Local ordinances set the requirements for controlling stormwater runoff from construction sites that may cause soil erosion and sedimentation in downstream waterways. Local ordinances are required to be developed under the U.S. Environmental Protection Agency's National Pollutant Discharge Elimination System program.

Question 5

What is the velocity (in ft/sec) in a rectangular concrete channel with a width of 3 feet (ft), a hydraulic grade line slope of 0.002 ft/ft, a flow depth of 1.5 ft and an assumed Manning's coefficient n = 0.014?

A)0.15 ft/sec
B)1.50 ft/sec
C)3.92 ft/sec
D)None of the above

Accepted Answer

the velocity in a rectangular channel with the given dimensions is 3.92 ft/sec. Solution: Use Manning's Equation and solve for V V = (K/n) R^2/3 Sf^1/2 Where: K = conversion coefficient (1.486 for English units, 1.0 for SI) n = 0.014, the Manning coefficient d = depth of flow = 1.5 ft w = width of channel = 3.0 ft Sf= channel slope = 0.002 ft/ft A = Area = d x w = 1.5 ft x 3 ft = 4.5 ft² P = wetted perimeter = w + 2d = 3 ft + 3 ft = 6 ft R = hydraulic radius = A/P = (4.5 ft² )/ (6 ft) = 0.75 ft V = (1.486/0.014) x (0.75 ft)^2/3 x (0.002 ft/ft)^1/2 = 3.92 ft/sec

Deck 1: Civil Engineering