Concrete Batch Plant Operator Exam(FDOT)
TEST QUESTIONS AND ANSWERS VERIFIED
LATEST UPDATE
Stockpiles of aggregate shall be maintained in a well-drained condition in order to: -
Answer- Minimize Free Water Content
Coarse aggregate stockpiles must be sprinkled for at lest how many hours prior to batch
for FDOT? - Answer- 24
Free moisture of the aggregate means: - Answer- Moister on the surface of an
aggregate that is above and beyond the absorbed moister in the aggregate.
If the moister test is done other than by the cook-out method, how often shall the other
methods be verified? - Answer- Each week
For drill shaft concrete, the quantity of cement replaced with fly ash shall be: - Answer-
33 thru 37%
In concrete, which material has a specific gravity of one? - Answer- Water
What is the air content range for all classes of structural concrete except Class IV
Shaft? - Answer- 1.00 thru 6.00%
When can unmetered water be added to the concrete? - Answer- Not at all.
Do not allow the total number of revolution at mixing speed to exceed: - Answer- 160
Revolutions
After all materials have been charged into the transit mixer drum, the concrete must be
mixed at how many revolutions at the plant before leaving for the project? - Answer- 70
to 100
When the water meters / scales are calibrated, prior to production, at what frequency
should they be checked there after? - Answer- 3 moths
To what accuracy should the scales for weighing cement , pozzolan, slag and
aggregates at the plant be maintained - Answer- 0.5% of maximum load normally
handled
For concrete containing a water-reducing retarding admixture, in an agitator truck, the
maximum time for depositing the concrete shall not exceed: - Answer- 90 minutes
TEST QUESTIONS AND ANSWERS VERIFIED
LATEST UPDATE
Stockpiles of aggregate shall be maintained in a well-drained condition in order to: -
Answer- Minimize Free Water Content
Coarse aggregate stockpiles must be sprinkled for at lest how many hours prior to batch
for FDOT? - Answer- 24
Free moisture of the aggregate means: - Answer- Moister on the surface of an
aggregate that is above and beyond the absorbed moister in the aggregate.
If the moister test is done other than by the cook-out method, how often shall the other
methods be verified? - Answer- Each week
For drill shaft concrete, the quantity of cement replaced with fly ash shall be: - Answer-
33 thru 37%
In concrete, which material has a specific gravity of one? - Answer- Water
What is the air content range for all classes of structural concrete except Class IV
Shaft? - Answer- 1.00 thru 6.00%
When can unmetered water be added to the concrete? - Answer- Not at all.
Do not allow the total number of revolution at mixing speed to exceed: - Answer- 160
Revolutions
After all materials have been charged into the transit mixer drum, the concrete must be
mixed at how many revolutions at the plant before leaving for the project? - Answer- 70
to 100
When the water meters / scales are calibrated, prior to production, at what frequency
should they be checked there after? - Answer- 3 moths
To what accuracy should the scales for weighing cement , pozzolan, slag and
aggregates at the plant be maintained - Answer- 0.5% of maximum load normally
handled
For concrete containing a water-reducing retarding admixture, in an agitator truck, the
maximum time for depositing the concrete shall not exceed: - Answer- 90 minutes
