ACI Aggregate Testing Technician -
Level 1 - Section 7
An ordinary frying pan should never be used with a hot plate because of heat transfer
problems. True or False? - CORRECT ANSWER-False; there are no heat transfer
problems
The mass of the test sample should be determined before and after the test to the
nearest ______ . - CORRECT ANSWER-0.1%
______ may cause particles to explode. - CORRECT ANSWER-Very rapid heating
To speed up the drying time and to avoid overheating in certain areas, ____ the sample
when using a hot plate or heat lamp. - CORRECT ANSWER-Stir
The presence of particular ____ in aggregates may cause ____ and ____ in microwave
ovens. - CORRECT ANSWER-Minerals, overheating, explosions
When further heating causes, or would cause, less than 0.1 % added ____ , the sample
may be considered thoroughly ______ . - CORRECT ANSWER-loss in mass, dry
For most purposes, this test method measures the moisture in a test sample more
reliably than the test sample ______ . - CORRECT ANSWER-Can be made to
represent the aggregate supply
A ventilated controlled-temperature oven should be used for the test when the
aggregate is _____ by heat or when a more _____ measurement is required. -
CORRECT ANSWER-Altered, refined· (or their equivalents)
It takes longer for moisture to travel from the interior of a large particle of coarse
aggregate to its exterior surface than from the interior of a small particle to its surface.
True or False? - CORRECT ANSWER-True
Quick-drying methods provide accurate results when used on large particles. True or
False or Unknown? - CORRECT ANSWER-Unknown; the user should determine by trial
If rapid drying methods provide sufficient accuracy for their intended use
The samples may be dried on a hot plate, with an electric ____ , in a ventilated ____ ,
or in a ventilated _____ . - CORRECT ANSWER-Heat lamp, oven, microwave oven
Which of the following are requirements for an acceptable container:
a) It should always be metallic
b) It should be large enough to eliminate spilling
Level 1 - Section 7
An ordinary frying pan should never be used with a hot plate because of heat transfer
problems. True or False? - CORRECT ANSWER-False; there are no heat transfer
problems
The mass of the test sample should be determined before and after the test to the
nearest ______ . - CORRECT ANSWER-0.1%
______ may cause particles to explode. - CORRECT ANSWER-Very rapid heating
To speed up the drying time and to avoid overheating in certain areas, ____ the sample
when using a hot plate or heat lamp. - CORRECT ANSWER-Stir
The presence of particular ____ in aggregates may cause ____ and ____ in microwave
ovens. - CORRECT ANSWER-Minerals, overheating, explosions
When further heating causes, or would cause, less than 0.1 % added ____ , the sample
may be considered thoroughly ______ . - CORRECT ANSWER-loss in mass, dry
For most purposes, this test method measures the moisture in a test sample more
reliably than the test sample ______ . - CORRECT ANSWER-Can be made to
represent the aggregate supply
A ventilated controlled-temperature oven should be used for the test when the
aggregate is _____ by heat or when a more _____ measurement is required. -
CORRECT ANSWER-Altered, refined· (or their equivalents)
It takes longer for moisture to travel from the interior of a large particle of coarse
aggregate to its exterior surface than from the interior of a small particle to its surface.
True or False? - CORRECT ANSWER-True
Quick-drying methods provide accurate results when used on large particles. True or
False or Unknown? - CORRECT ANSWER-Unknown; the user should determine by trial
If rapid drying methods provide sufficient accuracy for their intended use
The samples may be dried on a hot plate, with an electric ____ , in a ventilated ____ ,
or in a ventilated _____ . - CORRECT ANSWER-Heat lamp, oven, microwave oven
Which of the following are requirements for an acceptable container:
a) It should always be metallic
b) It should be large enough to eliminate spilling
