Municipal & Public Works Flashcards
Concrete curing procedures and curing compounds should be applied:
After final finishing as soon as the concrete surface is dry
Underground conductors for communication circuits entering a manhole that also contains light and power conductors:
Must be separated from the light and power conductors by a brick tile or concrete partition
Overhead data communications conductors are to be run between two buildings parallel to and below electrical power conductors. What minimum separation must be maintained between the two sets of conductors?
12”
A typical traffic weight manhole cover is how many inches in diameter?
12”
Where practical, a separation of at least how many feet shall be maintained between communications wires and cables on buildings and lightning conductors?
6 feet
What must a worker in the bottom of a bell hole be supplied with?
A lifeline and safety lanyard
What is the percentage of cement in concrete?
7-15%
What causes lung problems when sandblasting?
Crystalline silica
If workers must pass under scaffolding what should be done prior to use?
Provide a screen between the toeboard and the guard rail, extending along the entire opening, consisting of number 18 gauge
What is the best cleaning for a metal surface?
White blast
If too much cut back asphalt is applied, what shall be done to prevent bleeding of the prime coat up through the asphalt concrete?
Blot the excess coat with sand.
What do you do with rebar that sticks out horizontally from a wall for a future pour?
Cap the end to prevent impalement
What is the proper barrier fence for an open hole?
42” with a mid-rail
What is the schedule number used for carbon steel pipe 14” - 24”?
10-180
What is used in a drinking water plant to trap solids?
Sand
A benchmark is at an elevation of 35.11, cut invert is 17.35 height of the instrument is 4.07. What is the elevation of the invert?
21.83
35.11 + 4.07 +- 17.35 = 21.83
BM + Back Site - Front Site
If you are installing a socket and spigot tee, you should cut the line ________
A little shorter than the tee
When leveling equipment, it should be bolted and shimmed with what?
Metal shins
If hazardous atmospheres could reasonably be expected to exist, atmospheres shall be tested at how many feet?
4’
Class 4 lines shall be tested to how many times the Maximum Operating Pressure?
1.5
The junction box for underground electrical in a tier 5 location would be used for what?
A sidewalk with occasional non-deliberate vehicular traffic
According to OSHA, if a trench is unstable soil, the sides shall be sloped, shores, or braced if the trench is how many feet deep or more?
5
OSHA regulations state that if the permit for a confined space is canceled, the record must be retained for how many years?
1 year
What is true about a mechanical pipe joint?
The gasket should go on the socket end
Blowoff valves are placed where?
On the low elevations or at dead ends of the system
If employees are working in a building that has been damaged by fire, OSHA requires?
Walls or floors to be shored or braced
A jeep tests for holidays in pipeline coatings using?
Electrical charge
A tripod is being used for a rescue system for a confined space, however this system does not have a built in speed control. This will also require what?
A trained rescue team on site
A small length of steel Water main has been damaged. The piece will be cut out and replaced, what would be the best to use?
MJ Sleeve
What is the most stable bedding for underground telecommunications and electrical cable?
Sand
What is used to avoid electrolysis between copper and other metals?
Dialectic union
Overhead regulatory highway signs are placed a minimum of how many feet above the roadway?
17’
What method of connecting a control valve box that will allow easy removal for maintenance?
Bolted gasketed connection
What type of valve can be opened or closed quickly by lowering or raising a sliding stem?
Gate valve
What would be used to keep copper from corroding when attached to a different metal?
Dielectic Union
Water main piping is laid at what grade?
Even grade
Which fire extinguisher is rated to handle wood, metal, or electrical fires?
Dry chemical
When the nominal wall thickness of a pipe is not known, the pipe is measured at
1/4 points on one end
When using cast iron pipe in the construction of a natural gas transportation line, each caulked bell and spigot joint
Must be sealed with mechanical leak clamps
No welder may weld using a specific welding process unless the welder has been using that specific process within the last proceeding how many months?
6
With concrete that contains an accelerant, when would curing compound be added?
While concrete is slightly dark
A 1500 CY excavation needs to be filled. The material to be used has a 25% shrinkage factor. How many cubic yards will be needed?
2000
1500/.75
When pouring a concrete wall using plywood forms, when would you remove the cone nut?
After removing the sheathing
Spacers used for PVC underground electrical conduit power duct banks are made of?
Plastic
Who establishes the weight of large equipment?
Manufacturer
What test for welds would be used on a gas piping system?
Radiographic
What is used to disinfect a new ductile iron water main?
Chlorine then flush
When using LA One Call they will mark sewer gas and water lines from the edge of the property to
The construction stopping point
What test is used for leak testing concrete pipe and manholes?
Hydrostatic
A well point system is least effective in?
Clay
What would be attached to the boom of a track hoe to demolish concrete?
Hydraulic breaker
A valve box for a water distribution line would be found where?
In a larger above ground box
What type of lubricant would be used on a gasketed pipe that will contain potable water?
AWWA/ANSI standard 60
According to OSHA a crane operator certificate is valid for how long?
5 years
At the beginning intake of a waste water treatment plant, what would be used to remove all large and floating debris?
Bar screen
A Ph reading of 3.1 is considered
Acidic
What type of fire extinguisher is approved for burning metals such as fire caused by welding?
D
What is the minimum burial depth for a high-voltage line in IMC conduit under a parking lot?
24”
What is the minimum slope for a trench with type C soil?
1 1/2:1
Threaded taps in cast iron pipe without reinforcement is permitted up to a size of how many percent of the pipe diameter?
25%
Most pipeline welding is done using
SMAW
The standard used for pipeline weld quality is?
API 1104
OSHA requires certification for operators of
Cranes
Sewer and water mains that cross shall have a minimum vertical separation of how many inches?
18”
When installed in parallel, sewer and water mains shall be laid not less than how many feet apart?
6’
What bacteria is tested for when repairing potable water lines?
Coliform
Pallets containing 15 pipes that are 8 feet long each are being delivered to the job site. The best placement of each pallet should be where?
The first pallet at 60 foot and then 120 foot apart
A simple slope excavation 20 foot or less in type a soil shall have a maximum slope of
3/4:1
A PH reading of ____ is neutral
7
Which type of fire extinguisher is approved for an energized electrical equipment fire and flammable liquids?
Type BC
Which type of valve allows flow in one direction only?
Check
What are the standard dimensions of a rectangular manhole cover?
26” x 22”
According to code, when water service piping is installed in the same trench as sewer piping, there must be a minimum separation of
12”
A lift station is being built and boring logs sure water and sand at the invert elevation. What should be used to remove water from the excavation?
Well point
