CEW Section Quiz 15

CE-1     How much backfill soil is required to fill a 6 ft deep x 8 feet wide x 2500 foot long trench? The soil swell is 25% and the shrinkage is 12%.

CE-2     Given the following pieces of equipment, which one provides the lowest cost benefit? Assume the annual interest rate is 3.75%.

CE-3     Which of the following is not a required Activity constraint to assemble a CPM Project Plan:

CE-4     In the CPM Schedule shown, which path is the Critical Path?

CE-5     What load must a 400 sqft temporary structure support for the following:

• Dead load = 75 psf
• Construction dead load = 32 psf
• Variable material load = 12 psf
• Personnel and equipment load = 27 psf

CE-6     A construction method that utilizes insulated concrete formwork is known as:

CE-7     A steel beam is required to temporarily support a construction process. The beam will need to span 12 feet and carry a load of 1200 lbs/ft. The maximum allowable deflection is ¼”. What size W shape should be used? Neglect the weight of the beam.

CE-8     Calculate the total earth pressure force on a 6 foot high retaining wall using the Rankine method. The total unit weight of the soil is 123 pcf. The soil friction value is 31°.

CE-9     The settlement due to primary consolidation of a spread footing is measured to be 2.71”. The footing is installed on a 15 feet deep unconsolidated soil layer. Consolidation tests reveal that the void ratio (e₀) is 0.52. What is the change in void ratio (Δ_e)?

CE-10    If the groundwater level is 3 feet below ground, what is the Effective Stress at a point 10 feet below ground. The soil density is 135 lbs/ft³ and water density is 62.4 lbs/ft³.

CE-11    Calculate the size (area) of a square column footing to support a load of 250 kips. The footing is to be located on soft limestone (bearing capacity S_BC = 24ksf – 30ksf; use 24ksf). Neglect the weight of the footing.

CE-12    A 24” x 24” concrete footing is installed in a 21 ft deep normally consolidated clay layer. The pressure distribution ratio under the footing is 2:1. The clay layer has a density (ɣ) of 123 lbs/ft³, a compression index (C_c) of 0.24, and an initial void ratio (e₀) of 0.68. What is the distributed load area at the midpoint of the clay layer?

CE-13    Calculate the Critical Height of a 6 ft deep trench dug into soil with a cohesion of 121 lbs/ft², a soil unit weight of 120 lbs/ft³, and a stability number = 4.33.

CE-14    Which of the following would not be considered a dead load?

CE-15    In the truss shown, what is the force in BD?

CE-16    For the 20 ft beam shown with one end fixed and the other end supported with a concentrated load of 50kips at the center, what is the deflection at the point of the load? E = 29,000,000psi and I = 103 in⁴.

CE-17    What is the smallest and lightest size A36 W shape that could be used for a beam spanning 20ft with a uniformly distributed load of 370 lbs/ft? Maximum deflection allowed = 0.20 in.

CE-18    A 10 foot long column located outdoors and supporting a portion of a roof experiences temperature fluctuations from 20°F to 75°F regularly. If the base of the column is secured to a concrete footing (i.e. fixed), how much will the column change in length during these temperature changes?

CE-19    A footing supporting a column is subject to what type of shear stress?

CE-20    A steel beam fixed at one end and supported at the other is subjected to a uniform load of 20kips/ft. What is the maximum shear and where does it occur?

CE-21    Hydraulic jump occurs when a flow of _________ velocity discharges into a zone of __________ velocity.

CE-22    A 70 ft x 70 ft flat roof with a wall on one side extending 15 ft above the roof surface would require what size horizontal storm drainage pipe if the rainfall rate is 3 inches per hour?

CE-23    Which of the following is a type of stormwater drain inlet:

CE-24    Hydrographs are used to:

CE-25    Detention ponds and Retention ponds are structures built specifically for excess rainwater. A Retention pond is designed to __________ excess rainwater.

CE-26    Using the Darcy-Weisbach equation, calculate the head loss in a 10 ft section of 3” pipe. The Moody friction factor is 0.075, the density of the fluid is 1 lb/ft³, and the velocity of the fluid is 4 ft/sec.

CE-27    Water flows thru a 2” diameter pipe at 5 fps before the pipe increases in size to a 4” diameter. Assuming laminar flow, what is the new velocity of the water in the 4” diameter pipe?

CE-28    What is the tangent length for the following horizontal curve: Central angle of the curve (Δ) = 38° and the Curve radius = 107 ft

CE-29    The 2 types of sight distance are __________ and __________.

CE-30    Superelevation is a design feature of __________.

CE-31    In the USDA Soil Classification System, which of the following is not a subgroup:

CE-32    What is the Total Stress at the point shown? Z₁ = 10 ft, Z₂ = 2 ft, Z_w = 4ft Water density = 62.4 pcf.

CE-33    Hardness is defined as the measure of how resistant solid matter is to various kinds of permanent shape change when a force is applied. Since the behavior of solid materials under force is complex, there are different measurements of hardness. Which measurement of hardness measures the resistance of a sample to material deformation due to a constant compression load from a sharp object?

CE-34    Which of the following has the lowest yield strength:

CE-35    In the AASHTO Soil Classification system, soils containing less than 50% fines are classified as:

CE-36    The Modified Proctor test uses a 1/30 ft³ mold and a _____ pound hammer dropped _____ times from _____ inches.

CE-37    Calculate the total net cut for the following using the Prismoidal Method:

CE-38    In surveying, one mile equals _____ rods.

CE-39    Sediment control is the process that traps soil particles after they have been detached and moved by rain, flowing water, or wind. Which of the following is a method of sediment control:

CE-40    OSHA’s 10 most frequent construction site hazards are scaffolding, fall protection (scope, application, definitions), excavations (general requirements), ladders, head protection, excavations (requirements for protective systems), hazard communication, fall protection (training requirements), construction (general safety and health provisions), and electrical (wiring methods, design and protection). Approximately _____ fatalities occur each year due to scaffolding accidents.