Pipe & Excavation Contracting

Question 1

What should be the angle of repose for compacted sharp sand?

Answer 1

33°

Question 2

A reference stake has 13 ft. 8 in and f. 8 ft. 3. In written on it, what does the 13 ft 8 in mean?

Answer 2

That the reference stake is 13 ft 8 in from the center line.

Question 3

What is the problem with excavation in narrow spaces?

Answer 3

You cannot easily add water necessary for wetting.

Question 4

When installing a thrust block on a 8-in pipe carrying 100 PSI with a 45° fitting and the elbow bearing against sand, what is the thrust block surface area?

Answer 4

See Chart in pipe and excavation contracting. Page 197 figure 7-2.

Using chart in book:

4100 (thrust)÷ 1000 (estimating bearing load of soil)

Question 5

What is the calculation for production trenching /moving dirt in a back hose set?

Answer 5

Volume of dirt in set ÷ dirt Moved per cycle = digging cycles per set

Question 6

What do contour lines on a topographical map that form a closed loop represent?

Answer 6

A summit or depression

Question 7

A 100% slope is the same as a?

Answer 7

45° angle

Question 8

What is a cut sheet?

Answer 8

A form showing elevations, cuts, and horizontal distances to a fixed point.

Question 9

What type of pipe is typical used to connect at the top of a water heater?

Answer 9

Type m. Copper pipe

Question 10

What is the best method for hauling dirt over a long distance?

Answer 10

Self-loading scraper or loader and truck.

Question 11

You are excavating an area 245 ft by 350 ft, the equipment can remove 100 yrd³ per hour. If you need 6 inches of gray cut off the whole area, how many hours would it take?

Answer 11

245x350 = area
85750÷2 = cubic feet because it’s only 6”
42875÷27 = conversion to cubic yards
1587.9629629629 ÷ 100yrds/hr = 15.88hrs

Question 12

Coarse grained soils like gravel tend to withstand?

Answer 12

Saturation

Question 13

What type of slope is indicated by contours lines that are closer at the peak of the slope than at the bottom?

Answer 13

Concave.

Indicates that the slope of the land is increasing as it gets towards the peak.

Question 14

The best piece of vibratory compaction equipment in situation where you have a wide trench and no cross lines is:

Answer 14

Sheep’s foot roller

Question 15

When positioning a trench box it is always centered over the pipe. To mean safety in the ditch, the maximum height above the pipe you should install the tricks box is:

Answer 15

5 ft.

Question 16

What is a hub?

Answer 16

A small stake driven into the ground to identify some reference point

Question 17

The optimum hourly production rate is 700 loose cubic yards when working in soil with a 35% swell factor. What is the adjusted production rate in bank convict yards?( Pipe)

Answer 17

519

Question 18

Which statement is true about the impact of soil structure and density and the choice of compaction methods to Maximize production?

Answer 18

Course sand and gravel compact well with water and vibration

Question 19

An advantage of nuclear compaction test compared to other methods is that?

Answer 19

It does not require the removal of soil samples from the site of the test.

Question 20

The advantage of using an angle blade over a straight blade is to:

Answer 20

Side cast materials.

Question 21

If an operator fails too lift, tilt, an angle, the blade of a dozer just right:

Answer 21

Most of the load is lost

Question 22

To convert bank cubic yards you divide your cubic feet total by?

Answer 22

27

Question 23

The level of underground water is called

Answer 23

Water table

Question 24

The advantage of a u-blade over a semi u blade is it:

Answer 24

Holds more material

Question 25

Before making a pass, what should the dozer be aligned with?

Answer 25

Blade dump area.

Question 26

What is the best method for compacting sanding gravel?

Answer 26

Puddling and vibration

Question 27

The best piece of equipment to strip material over a long distance is a:

Answer 27

Scraper

Question 28

You are checking elevations in an excavated area. There are three stake sets called a, b, and c. This A stake is labeled 3 ft. 4. In, the bee stake is labeled 4 ft 10 inches and the c stake is labeled the 7 ft. 2. In. What is the difference between stake a and c?

Answer 28

3 ft. 10 in

Question 29

It is virtually impossible to compact without adequate?

Answer 29

Moisture.

Question 30

With salt fences, generally the maximum spacing between posts should be _____ and the post-depth should be at least ____.

Answer 30

6ft, 12in