EXAM #2

Question 1

The BTU is the amount of heat required to raise the temperature of one cu. ft. of air:

Answer 1

55˚

Question 2

What is rock that is easily dislodged by bars and wedges called?

Answer 2

Common Rock

Question 3

What is the minimum time of mixing ingredients for asphalt concrete at the batch plant usually?

Answer 3

30 seconds

Question 4

Vibrators or tampers on the paver are used to get aggregate particles oriented into position. The mixture reaches about_____ %of its eventual density.

Answer 4

80%

Question 5

There are ___ square feet in an acre.

Answer 5

43,560

Question 6

What is done with the roots and rocks when clearing and grubbing is required to establish a finishing grade?

Answer 6

Permission is obtained to remove them and dispose of them

Question 7

Rounded gravel provides displacement better under rollers than rough-textured crushed rock. Gradings with an excess of material passing the ___ sieve can be hard to compact.

Answer 7

No. 4

Question 8

What is considered the safe distance from a magazine for explosives to be opened?

Answer 8

50 feet

Question 9

Foundation wall footings for a house are to be backfilled by hand. One person can shovel about 24 cu. yds. Of earth per work day. How much earth can 2 people backfill in 2 days?

Answer 9

96. Cu.yds

Question 10

A kind of machine mix in concrete is called a/an?

Answer 10

Batch

Question 11

How many feet before the construction work should the flagger be placed?

Answer 11

100 feet

Question 12

When paving operations call for widths not common to normal paver widths:

Answer 12

Cutoff shoes or screed extensions may be used

Question 13

In excavating a trench for a gravity flow sewer line, the elevation difference that provides the gradient which will help in carrying off the sewage is properly known as:

Answer 13

Fall

Question 14

The finished thickness of the lime-treated material shall not vary more than ___ from the planned thickness at any point.

Answer 14

0.10 foot

Question 15

What is the first thing that a driver should do when preparing to back up a piece of construction equipment?

Answer 15

Check back up alarm

Question 16

A mix with incorrect coating or a stiff appearance of the larger aggregate particles signifies:

Answer 16

A cold mixture

Question 17

Magazine buildings shall be located ___feet from low voltage electrical lines and ___ feet from high voltage electrical lines.

Answer 17

25 ; 100

Question 18

All measurements are computed from a ___ grade stake offset. There is no difference in this respect between a vertical and rolled curb.

Answer 18

2 foot

Question 19

What should the temperature be at the time of the first roll following the breakdown roll?

Answer 19

150˚ or more

Question 20

Two types of straightedges are:

Answer 20

Rolling straightedge
Wood or metal straightedge laid on pavement

Question 21

The operator can snake the scraper out by swinging the nose back and forth, if the mud is too deep or can?

Answer 21

Set the bowl down lifting the wheels

Question 22

When mixing concrete, which ratio of water & cement indicates low-strength cement?

Answer 22

1 to 4

Question 23

If it is hard to place, because there is too much filler in the mixture on should:

Answer 23

Increase placing temperature

Question 24

How far apart must the upright braces be spaced when shoring a trench?

Answer 24

8 feet

Question 25

If there is one lane in use for 2 directions of traffic, which of the following is necessary?

Answer 25

One flagman for each direction of traffic

Question 26

What is the proper method of disposing of non-explosive caps?

Answer 26

Burn them

Question 27

In shoring a trench, the pieces of lumber that run along each side of the trench longitudinally and are wedges against the sheathing or sheet piling to hold it in place are:

Answer 27

Whalers

Question 28

If a pipe is buried in concrete, which has the best resistance to corrosion?

Answer 28

PVC

Question 29

There is a smoother and quieter riding surface with aggregates smaller than ___ in diameter.

Answer 29

1/2”

Question 30

Rapid curing cutbacks, due to the volatility of the solvent being extremely hazardous, may flash as low as:

Answer 30

80˚F

Question 31

Internal stress or torque in a structural member which resists the lengthening effect of an externally applied force tending to increase the length of a member is known as:

Answer 31

Tensile strentgh

Question 32

If a slurry seal is placed shortly before the overlay, cured and clean a tack coat:

Answer 32

May not be needed

Question 33

A sprayed on application of asphalt to a wearing surface, with or without a thin layer of covering aggregate, is called an asphalt surface treatment, ___ or less in thickness.

Answer 33

1”

Question 34

What is an area drain?

Answer 34

it is used to collect water from a particular area and put it into pipes that are underground

Question 35

Spraying of untreated surface with a diluted slow-setting asphalt emulsion or a low-viscosity cutback is known as:

Answer 35

Dust laying

Question 36

To what temperature should asphalt be heated before it is installed?

Answer 36

250˚ to 325˚

Question 37

Some agencies require that pavement passes between joints be:

Answer 37

At the edge of the lanes

Question 38

In figuring an estimate, drilling and blasting rock are taken off by its __ cubic yards quantity.

Answer 38

In-ground

Question 39

The maximum mixing temperature of asphalt should never exceed:

Answer 39

177˚

Question 40

The name of the scum on the top of the asphalt after it is rolled and set is:

Answer 40

Laitance

Question 41

Natural gas has a heat value of ____ BTU’s per cubic foot.

Answer 41

1100

Question 42

How many reflectorized rail faces does a Type II barricade have?

Answer 42

4

Question 43

A swale is:

Answer 43

An invert on the ground

Question 44

Leveling and dressing ground surfaces either by hand or machine conforming to pre-specified contours or elevations I preparation for a subsequent operation is known as:

Answer 44

Grading

Question 45

If unstable material causes displacement, instead of aerating and drying the soil it is best to remove the unstable material and backfill with:

Answer 45

Asphalt aggregate mixture

Question 46

Final compaction shall be completed approximately within ___ hours of final mixing.

Answer 46

36

Question 47

A compression member whose unsupported length is ten or more times its least width is called a:

Answer 47

Column

Question 48

How many feet over public walkways must service conductors be placed?

Answer 48

10 feet

Question 49

Portable flashing beacons are mounted at a height of how many meters to the bottom of the lens?

Answer 49

3 meters