NB ASBOG Assorted PG material Exam-
Graded A
If more than 50% of soil is retained on the No. 200 sieve (0.003 inch), the soil is
classified as: - ANS-Coarse grained
What sieve number is the boundary for coarse and fine grained soils? - ANS-No. 200
(0.003 inch)
If more than 50% of soil is retained on the No 4 sieve, it is classified as a: - ANS-Gravel
Material retained on this sieve number represents the smallest particle size visible to the
unaided eye: - ANS-No. 200 (0.003 inch) sieve
The larger the "us standard sieve" number, the _____ the particle size. - ANS-Smaller.
For example, gravel is retained on the no. 4 sieve, medium sand is retained on the no.
40 sieve, and find grained sand is retained on the no. 200 sieve.
A soil is considered poorly graded if it contains ____ or fewer sieve sizes. - ANS-3
For a gravel or sand to be assigned a W or P, there must be what percentage or lower
of fines? - ANS-<5% fines
A well-graded soil has a Uniformity coefficient of greater than ___ for gravel and ___ for
sand - ANS-4, 6
If there are between 5% and 12% fines in a gravelly or sandy soil, what would the
classification look like? - ANS-It would be a dual classification, showing the first group
symbol plus a second that indicates "with clay" or "with silt"
Eg:
GW-GM- well graded gravel with silt
SP-SC- poorly graded sand with clay
Symbols used when fines exceed 12% of total sample weight - ANS-"C" or "M"
Eg:
GM- silty gravel
SC- clayey sand
Uniformity coefficient equation - ANS-Cu= D60/D10
Curvature coefficient equation - ANS-Cc=D30^2/D10•D60
, _____ have little to no strength when dry, while ____ have considerable strength. -
ANS-Silts, clays
The plasticity index value is determined using what lab method? - ANS-Atterburg Limits
test
Fine grained soils with a LL >50 are assigned what symbol? - ANS-H (high plasticity)
Fine grained soils with LL<50 are assigned what symbol? - ANS-L (low plasticity)
Fine grained soils with 30% or more coarse grained fractions should be modified with
these descriptive words: - ANS-Gravelly or sandy
Dry strength _____ with increased plasticity - ANS-Increases
Three field identification procedures for fine grained soils - ANS-1. Dry strength
(crushing characteristics)- silts and silty sands have a low dry strength, while clays have
high strength
2. Dilatancy (reaction to shaking)- fine, clean sands exhibit water when shaken and
disappearance of water when squeezed, clays show no reaction.
3. Toughness (consistency near the plastic limit)- high plasticity clays form a tougher
tread and stiffer lump when it crumbles (reaches plastic limit)
Clays that have a high swelling potential generally have a PI above: - ANS-18
The Rock quality designation (RQD) is determined by: - ANS-The sum of all the core
lengths >4" divided by the total core length
Come penetrometers are used to obtain a measurement of - ANS-Soil resistance
Vane shear test measures - ANS-In-situ shear strength and sensitivity of cohesive fine
grained soils. It is performed in the field on sensitive clayey materials before the soils
are disturbed.
A lysimeter is used to: - ANS-Sample the water chemistry in the Vadose zone, measure
deep percolation and evapotranspiration
A slug test is conducted to determine: - ANS-Hydraulic conductivity, transmissibility in
aquifer
Step drawdown test: - ANS-The well is pumped at series of increasingly higher pumping
rates with measurements of drawdown at each change. Used as a well performance
test.
Graded A
If more than 50% of soil is retained on the No. 200 sieve (0.003 inch), the soil is
classified as: - ANS-Coarse grained
What sieve number is the boundary for coarse and fine grained soils? - ANS-No. 200
(0.003 inch)
If more than 50% of soil is retained on the No 4 sieve, it is classified as a: - ANS-Gravel
Material retained on this sieve number represents the smallest particle size visible to the
unaided eye: - ANS-No. 200 (0.003 inch) sieve
The larger the "us standard sieve" number, the _____ the particle size. - ANS-Smaller.
For example, gravel is retained on the no. 4 sieve, medium sand is retained on the no.
40 sieve, and find grained sand is retained on the no. 200 sieve.
A soil is considered poorly graded if it contains ____ or fewer sieve sizes. - ANS-3
For a gravel or sand to be assigned a W or P, there must be what percentage or lower
of fines? - ANS-<5% fines
A well-graded soil has a Uniformity coefficient of greater than ___ for gravel and ___ for
sand - ANS-4, 6
If there are between 5% and 12% fines in a gravelly or sandy soil, what would the
classification look like? - ANS-It would be a dual classification, showing the first group
symbol plus a second that indicates "with clay" or "with silt"
Eg:
GW-GM- well graded gravel with silt
SP-SC- poorly graded sand with clay
Symbols used when fines exceed 12% of total sample weight - ANS-"C" or "M"
Eg:
GM- silty gravel
SC- clayey sand
Uniformity coefficient equation - ANS-Cu= D60/D10
Curvature coefficient equation - ANS-Cc=D30^2/D10•D60
, _____ have little to no strength when dry, while ____ have considerable strength. -
ANS-Silts, clays
The plasticity index value is determined using what lab method? - ANS-Atterburg Limits
test
Fine grained soils with a LL >50 are assigned what symbol? - ANS-H (high plasticity)
Fine grained soils with LL<50 are assigned what symbol? - ANS-L (low plasticity)
Fine grained soils with 30% or more coarse grained fractions should be modified with
these descriptive words: - ANS-Gravelly or sandy
Dry strength _____ with increased plasticity - ANS-Increases
Three field identification procedures for fine grained soils - ANS-1. Dry strength
(crushing characteristics)- silts and silty sands have a low dry strength, while clays have
high strength
2. Dilatancy (reaction to shaking)- fine, clean sands exhibit water when shaken and
disappearance of water when squeezed, clays show no reaction.
3. Toughness (consistency near the plastic limit)- high plasticity clays form a tougher
tread and stiffer lump when it crumbles (reaches plastic limit)
Clays that have a high swelling potential generally have a PI above: - ANS-18
The Rock quality designation (RQD) is determined by: - ANS-The sum of all the core
lengths >4" divided by the total core length
Come penetrometers are used to obtain a measurement of - ANS-Soil resistance
Vane shear test measures - ANS-In-situ shear strength and sensitivity of cohesive fine
grained soils. It is performed in the field on sensitive clayey materials before the soils
are disturbed.
A lysimeter is used to: - ANS-Sample the water chemistry in the Vadose zone, measure
deep percolation and evapotranspiration
A slug test is conducted to determine: - ANS-Hydraulic conductivity, transmissibility in
aquifer
Step drawdown test: - ANS-The well is pumped at series of increasingly higher pumping
rates with measurements of drawdown at each change. Used as a well performance
test.
