3-24.
3-25.
3-26.
3-27.
3-28.
3-29.
3-30.
3-31.
Coars-grained sils are divided
into what divisions?
1.
Silt and sand
2.
Clay and gravel
3.
Sand and gravel
4.
Clay and silt
To classify a coarse-grained soil,
you would use what sieve?
1. 1/4 inch
2. No. 4
3. No. 50
4. No. 200
Coarse-grained soils with more than
12-percent fines are classified by
what characteristic(s)?
1.
Cohesiveness
2.
Liquid limit
3.
Plasticity index
4.
Both 2 and 3 above
For a soil sample to be classified
as silty gravel, the plasticity
index should be
1.
more than 7
2.
between 4 and 7
3.
less than 4
4.
unmeasurable
Coarse-grained soils with between
5- and 12-percent fines are
classified in what manner?
1.
By dual symbols
2.
As clayey silts
3.
As nonplastic, nonliquid soils
4.
As silty clays
A borderline soil may meet more
than one zone requirement.
1.
True
2.
False
Fine-grained soils are classified
based on what requirement?
1.
Plasticity index
2.
Grain-size distribution
3.
Percentage of organic material
4.
Liquid limit
Plastic silts have what group
designation?
1. MH
2. ML
3. MP
4. MW
3-32.
3-33.
3-34.
Peat is identified in what manner?
1.
By grain-size distribution
2.
By liquid limit determination
3.
By odor
4.
By plasticity index
determination
Cc is defined as the coefficient of
1.
uniformity of the grain-size
curve
2.
gradation
3.
curvature of the gradation
curve
4.
distribution
To determine the coefficient of
uniformity, you must have what
information?
1.
Percent retained on the No. 10
and No. 60 sieves
2.
Percent passing the No. 10 and
No. 60 sieves
3.
Grain size, in centimeters, at
10- and 60-percent passing
levels on the gradation curve
4.
Grain size, in millimeters, at
10- and 60-percent passing
levels on the gradation curve
r
YOU HAVE COMPLETED A SIEVE ANALYSIS WITH
THE FOLLOWING RESULTS:
SIEVE SIZE
PERCENT PASSING
1/2 IN.
100
1 IN.
74
3/4 IN.
57
1/2 IN.
40
NO.
4
27
NO. 10
22
NO. 40
14
NO. 60
8
NO. 100
5
NO. 200
3.8
Figure 3A
IN ANSWERING QUESTIONS 3-35 THROUGH 3-39,
USE THE INFORMATION FROM FIGURE 3A.
3-35.
What is the value of D60 for this
soil sample?
1.
7.2 mm
2.
20.0 mm
3.
29.6 mm
4.
37.3 mm
3-36.
What is the coefficient of
uniformity (CU) of this soil sample?
1.
18.1
2.
32.7
3.
48.9
4.
66.7
16
