ACI Aggregate Testing Technician - Level 2 Exam Questions and Answers Already Passed
Latest Update 2025-2026
AASHTO T 96 LA Machine Small-Size Course Agg.
1. In this test "small-size" coarse aggregate is considered to be aggregate smaller than 19 mm
(3/4 in.). True or False? - Answers False, 1½ in.
AASHTO T 96 LA Machine Small-Size Course Agg.
2. The aggregate tested in the Los Angeles Machine is subjected to such actions as _________,
________., ________., and ________ - Answers Abrasion, attrition, impact, grinding.
AASHTO T 96 LA Machine Small-Size Course Agg.
3. What promotes the degradation of the aggregates in the rotating steel drum? - Answers Steel
spheres
AASHTO T 96 LA Machine Small-Size Course Agg.
4. This test indicates the relative _________ or __________ of aggregates composed of similar
_________ - Answers Quality or competence; minerals
AASHTO T 96 LA Machine Small-Size Course Agg.
5. The Los Angeles Machine consists of a hollow ____________, with an opening for the
introduction of the test sample, a dust-tight ______, and a ___________ shelf. - Answers Steel
cylinder; cover; removable steel
AASHTO T 96 LA Machine Small-Size Course Agg.
6. A shelf of wear-resistant steel, rectangular in cross section, and mounted on the cover, is
preferred. True or False? - Answers False, a shelf mounted independently of the cover is
preferred.
AASHTO T 96 LA Machine Small-Size Course Agg.
,7. A _________ , __________ speed must be maintained. - Answers Uniform, peripheral
AASHTO T 96 LA Machine Small-Size Course Agg.
8. The steel spheres should be 31.8 mm (1-1/4 in.) in diameter and have a mass of 320 g. True
or False? - Answers False; they should average 46.8 mm (1-27/32 in.) and have a mass between
390 and 445 g.
AASHTO T 96 LA Machine Small-Size Course Agg.
9. If grading B is used, ____ spheres are needed. - Answers 11
AASHTO T 96 LA Machine Small-Size Course Agg.
10. After the test sample and steel spheres are in the machine, rotate the drum at __ to __ r/min.
for ____ revolutions. - Answers 30-33 r/min for 500 revolutions.
AASHTO T 96 LA Machine Small-Size Course Agg.
11. After the required revolutions, separate the material using a ______________ - Answers 1.70
mm sieve (No. 12 sieve)
AASHTO T 96 LA Machine Small-Size Course Agg.
12. The _______ material that remains after sieving, should be oven-dried to ______ - Answers
Coarse; substantially constant mass
AASHTO T 96 LA Machine Small-Size Course Agg.
13. Computing the ratio of loss after 100 revolutions to the loss after 500, may offer valuable
information regarding the uniformity of the test sample. True or False? - Answers True
AASHTO T 96 LA Machine Small-Size Course Agg.
, 14. The difference between the original mass of the test sample and the final mass should be
reported as a percent of the ___________________ . This is the percent loss. - Answers Original
mass
AASHTO T 96 LA Machine Small-Size Course Agg.
15. The results of properly conducted tests run by different laboratories on the same coarse
aggregates are not expected to differ by more than ____ % of their average. - Answers 12
ASTM C535 LA Machine Large-Size Course Agg.
1. This test method covers all aggregate larger than 10 mm (3/8 in.). True or False? - Answers
False; larger than 19 mm (3/4 in.)
ASTM C535 LA Machine Large-Size Course Agg.
2. This test relies on the rotation of a ______ drum containing 12 ______ spheres to abrade and
grind aggregate. - Answers Steel; steel
ASTM C535 LA Machine Large-Size Course Agg.
3. The number of revolutions of the drum is immaterial providing that the operator runs the
machine for 30 min. True or False? - Answers False, the number of revolutions is prescribed to
provide valid test results.
ASTM C535 LA Machine Large-Size Course Agg.
4. This test indicates the relative __________ or __________ of different aggregate sources which
have similar mineral composition. - Answers Quality; Competence
ASTM C535 LA Machine Large-Size Course Agg.
5. Since aggregate sources may differ in origin, composition, and structure, valid comparisons
of results _________________________________ - Answers Cannot be automatically made.
Latest Update 2025-2026
AASHTO T 96 LA Machine Small-Size Course Agg.
1. In this test "small-size" coarse aggregate is considered to be aggregate smaller than 19 mm
(3/4 in.). True or False? - Answers False, 1½ in.
AASHTO T 96 LA Machine Small-Size Course Agg.
2. The aggregate tested in the Los Angeles Machine is subjected to such actions as _________,
________., ________., and ________ - Answers Abrasion, attrition, impact, grinding.
AASHTO T 96 LA Machine Small-Size Course Agg.
3. What promotes the degradation of the aggregates in the rotating steel drum? - Answers Steel
spheres
AASHTO T 96 LA Machine Small-Size Course Agg.
4. This test indicates the relative _________ or __________ of aggregates composed of similar
_________ - Answers Quality or competence; minerals
AASHTO T 96 LA Machine Small-Size Course Agg.
5. The Los Angeles Machine consists of a hollow ____________, with an opening for the
introduction of the test sample, a dust-tight ______, and a ___________ shelf. - Answers Steel
cylinder; cover; removable steel
AASHTO T 96 LA Machine Small-Size Course Agg.
6. A shelf of wear-resistant steel, rectangular in cross section, and mounted on the cover, is
preferred. True or False? - Answers False, a shelf mounted independently of the cover is
preferred.
AASHTO T 96 LA Machine Small-Size Course Agg.
,7. A _________ , __________ speed must be maintained. - Answers Uniform, peripheral
AASHTO T 96 LA Machine Small-Size Course Agg.
8. The steel spheres should be 31.8 mm (1-1/4 in.) in diameter and have a mass of 320 g. True
or False? - Answers False; they should average 46.8 mm (1-27/32 in.) and have a mass between
390 and 445 g.
AASHTO T 96 LA Machine Small-Size Course Agg.
9. If grading B is used, ____ spheres are needed. - Answers 11
AASHTO T 96 LA Machine Small-Size Course Agg.
10. After the test sample and steel spheres are in the machine, rotate the drum at __ to __ r/min.
for ____ revolutions. - Answers 30-33 r/min for 500 revolutions.
AASHTO T 96 LA Machine Small-Size Course Agg.
11. After the required revolutions, separate the material using a ______________ - Answers 1.70
mm sieve (No. 12 sieve)
AASHTO T 96 LA Machine Small-Size Course Agg.
12. The _______ material that remains after sieving, should be oven-dried to ______ - Answers
Coarse; substantially constant mass
AASHTO T 96 LA Machine Small-Size Course Agg.
13. Computing the ratio of loss after 100 revolutions to the loss after 500, may offer valuable
information regarding the uniformity of the test sample. True or False? - Answers True
AASHTO T 96 LA Machine Small-Size Course Agg.
, 14. The difference between the original mass of the test sample and the final mass should be
reported as a percent of the ___________________ . This is the percent loss. - Answers Original
mass
AASHTO T 96 LA Machine Small-Size Course Agg.
15. The results of properly conducted tests run by different laboratories on the same coarse
aggregates are not expected to differ by more than ____ % of their average. - Answers 12
ASTM C535 LA Machine Large-Size Course Agg.
1. This test method covers all aggregate larger than 10 mm (3/8 in.). True or False? - Answers
False; larger than 19 mm (3/4 in.)
ASTM C535 LA Machine Large-Size Course Agg.
2. This test relies on the rotation of a ______ drum containing 12 ______ spheres to abrade and
grind aggregate. - Answers Steel; steel
ASTM C535 LA Machine Large-Size Course Agg.
3. The number of revolutions of the drum is immaterial providing that the operator runs the
machine for 30 min. True or False? - Answers False, the number of revolutions is prescribed to
provide valid test results.
ASTM C535 LA Machine Large-Size Course Agg.
4. This test indicates the relative __________ or __________ of different aggregate sources which
have similar mineral composition. - Answers Quality; Competence
ASTM C535 LA Machine Large-Size Course Agg.
5. Since aggregate sources may differ in origin, composition, and structure, valid comparisons
of results _________________________________ - Answers Cannot be automatically made.
