C-12 Practice Questions Flashcards
If trench walls are too loose or soft for shoring, the walls must be sloped at least:
3/4:1
Which type of trencher can get closer to a pipe than any other trencher ?
Bucket-line trencher
Where do you set a string line before paving with asphalt ?
6” offset from center line of a road way
Type “A” warning lights are :
Low intensity flashing warning lights
Type “B” warning lights are:
High-intensity warning lights
Type “C” warning lights are:
Steady-Burn lights
Flaggers should be provided with what color vest or jacket for daytime use ?
Orange
A flagged should stand within _____ of a work area with what size flag ?
100 feet ; 18”
Rocks in an aggregate base that have come to the top with no fines to bind them are called:
Bony Grade
Which type of material would you use as initial backfill for asbestos-cement pipe?
Sand
Existing concrete must be removed to a depth of _____ beneath finish grade
3 feet
When breaking up concrete for use in fill, what is the maximum dimension allowed for any piece ?
6”
Which type of equipment is best for trenching in very lose or soft soil ?
Dragline
A road grade falls 10 ft over a horizontal distance of 20 ft. What is the slope ?
2:1
When you are paving an asphalt road in one pass, how should you proceed ?
Start rolling on low side and progress toward high side
On a public works project, if a contractor breaks a water line not shown on the plans while installing a curb and gutter, who would be responsible ?
Awarding authority
A detour sign is classified as what kind of sign ?
Construction sign
What color should a flashing warning light be ?
Yellow
A job calls for you to remove and dispose of concrete from an existing road. How far from the nearest tree or pipeline must you bury the concrete ?
10 feet
The temperature for spreading regular asphalt is between ?
250˚ to 325˚
The temperature range for spreading open-graded asphalt is ?
200˚F to 250˚F
White spray paint is used to mark excavation site on paved surfaces, if the marks could be misinterpreted as a traffic of pedestrian control, the excavator must use what color marking ?
Pink
