On a buried ductile-iron water main in corrosive soil, DIPRA's generally recommended external corrosion-control method is:
Water And Sewer
Question · Easy
A water-main trench is 280 feet long, 3.5 feet wide, and 6 feet deep with vertical sides. The excavated volume is closest to:
Question · Hard
Unbalanced hydrostatic thrust at a ductile-iron bend, tee, or dead end is typically resisted by:
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Under DIPRA laying conditions, a Type 4 installation generally means the pipe is:
Question · Medium
After a reinforced-concrete pipe or box culvert with lifting holes is set to line and grade, the lifting holes should be:
A new 12-inch ductile-iron water main has a 100 psi working pressure. Under ANSI/AWWA C600, the hydrostatic test pressure at the lowest point of the test section should be not less than:
When bedding concrete or ductile-iron pipe, the haunch zone is critical because:
A sewer trench is 360 feet long, 30 inches wide, and 8 feet deep with vertical sides. The excavated volume is closest to:
Bell holes are excavated in the trench bottom so that:
Immediately before homing a gasketed concrete or ductile-iron pipe joint, the crew should:
Gravity sanitary sewers are laid to a designed invert grade primarily to:
DIPRA notes that ductile-iron push-on joints may be deflected:
When joining (homing) precast box-culvert sections, excess bedding at the connection should be:
For a concrete box culvert founded on rock, ACPA installation guidance calls for bedding thickness of about:
After a ductile-iron pipe is field-cut, the cut end should be:
Pipe-zone backfill around a newly laid water or sewer line should be placed:
ASME B31.8, a listed reference for the Mississippi Heavy Construction exam, covers:
Gas
Under ASME B31.8, the steel-pipe design factor F for a Class 3 location is:
ASME B31.8 class location is assigned primarily from:
For strength testing a newly constructed steel gas pipeline under ASME B31.8, the preferred test medium is:
Field girth welds on ASME B31.8 gas piping may be made only by:
Buried steel gas transmission and distribution pipe requires external corrosion control, which typically includes:
As ASME B31.8 location class increases from Class 1 to Class 4, the steel-pipe design factor F:
When installing a buried steel gas main, the contractor must provide the specified depth of cover because:
The primary purpose of compacting a hot-mix asphalt mat is to:
Paving
In a typical hot-mix asphalt roller train, the first roller on the hot mat is the:
A paving crew will place a 1,000-foot-long, 12-foot-wide, 2-inch compacted HMA lift. Using 145 pounds per cubic foot, the mix required is:
When compacting a hot longitudinal joint, the preferred practice is to:
On an HMA paving job, a nuclear density gauge is used primarily to:
A tack coat is applied before an HMA overlay primarily to:
Coarse-particle segregation in an HMA mat typically appears as:
A crew will place 800 feet of 11-foot-wide HMA at a 3-inch compacted thickness. Using 145 pounds per cubic foot, the mix required is closest to:
Before placing HMA on an existing pavement, the surface should be:
A transverse HMA construction joint should generally be built as:
On a crowned roadway, breakdown rolling of a fresh HMA lift should generally:
Estimate HMA needed for a 600-foot × 13-foot × 1.5-inch compacted lift at 145 pounds per cubic foot. The quantity is closest to:
The main purpose of compacting soil in an embankment or trench backfill is to:
Excavation Compaction Grading
A field density test shows a dry unit weight of 117.6 pounds per cubic foot. The laboratory maximum dry density is 124.0 pounds per cubic foot. Percent compaction is:
Optimum moisture content (OMC) is the moisture content at which:
A parking area 120 feet by 24 feet will be cut an average of 2.25 feet. The excavated volume is:
Field dry density of compacted soil is commonly compared with the laboratory Proctor maximum by using:
A sheepsfoot or padfoot roller is generally the better choice for compacting:
Soil should be compacted in specified loose lift thicknesses because:
Proof rolling a prepared subgrade is done to:
Blue tops, hubs, or GPS/laser grade control are used during grading to:
A job will excavate 300 bank cubic yards of soil that swells 25 percent when loaded. The loose volume to be hauled is:
Before placing pavement base or a structure on a soil subgrade, organic topsoil and other unsuitable material should be:
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