Concrete Batch Plant Operator Exam
(FDOT) UPDATED ACTUAL Questions
and CORRECT Answers
Stockpiles of aggregate shall be maintained in a well-drained condition in order to: -
CORRECT ANSWER✔✔- Minimize Free Water Content
Coarse aggregate stockpiles must be sprinkled for at lest how many hours prior to batch for
FDOT? - CORRECT ANSWER✔✔- 24
Free moisture of the aggregate means: - CORRECT 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? - CORRECT ANSWER✔✔- Each week
For drill shaft concrete, the quantity of cement replaced with fly ash shall be: - CORRECT
ANSWER✔✔- 33 thru 37%
In concrete, which material has a specific gravity of one? - CORRECT ANSWER✔✔- Water
What is the air content range for all classes of structural concrete except Class IV Shaft? -
CORRECT ANSWER✔✔- 1.00 thru 6.00%
When can unmetered water be added to the concrete? - CORRECT ANSWER✔✔- Not at
all.
Do not allow the total number of revolution at mixing speed to exceed: - CORRECT
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? - CORRECT
ANSWER✔✔- 70 to 100
, When the water meters / scales are calibrated, prior to production, at what frequency should
they be checked there after? - CORRECT ANSWER✔✔- 3 moths
To what accuracy should the scales for weighing cement , pozzolan, slag and aggregates at
the plant be maintained - CORRECT 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: - CORRECT ANSWER✔✔- 90
minutes
If a load of concrete has been rejected due to excessive slump, the concrete may remain in the
transporting vehicle to reduce the slump. - CORRECT ANSWER✔✔- Is not allowed.
Who places the orders for concrete with the producer? - CORRECT ANSWER✔✔- The
contractor
The minimum normal sampling frequency for the chloride content of structural concrete is: -
CORRECT ANSWER✔✔- 1 per design mix in use from the first day of production and
every 30 calendar days or less thereafter.
In what moister condition are the aggregates on the approved concrete mix designs? -
CORRECT ANSWER✔✔- SSD condition
The specific gravity of an aggregate is the ratio of its unit weight to the weight of an equal
absolute volume of: - CORRECT ANSWER✔✔- Water
What is the weight of a bag of Portland cement in the USA? - CORRECT ANSWER✔✔- 94
lbs
What is the maximum concrete temperature allowed when using a hot weather design mix? -
CORRECT ANSWER✔✔- 100 degrees F
(FDOT) UPDATED ACTUAL Questions
and CORRECT Answers
Stockpiles of aggregate shall be maintained in a well-drained condition in order to: -
CORRECT ANSWER✔✔- Minimize Free Water Content
Coarse aggregate stockpiles must be sprinkled for at lest how many hours prior to batch for
FDOT? - CORRECT ANSWER✔✔- 24
Free moisture of the aggregate means: - CORRECT 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? - CORRECT ANSWER✔✔- Each week
For drill shaft concrete, the quantity of cement replaced with fly ash shall be: - CORRECT
ANSWER✔✔- 33 thru 37%
In concrete, which material has a specific gravity of one? - CORRECT ANSWER✔✔- Water
What is the air content range for all classes of structural concrete except Class IV Shaft? -
CORRECT ANSWER✔✔- 1.00 thru 6.00%
When can unmetered water be added to the concrete? - CORRECT ANSWER✔✔- Not at
all.
Do not allow the total number of revolution at mixing speed to exceed: - CORRECT
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? - CORRECT
ANSWER✔✔- 70 to 100
, When the water meters / scales are calibrated, prior to production, at what frequency should
they be checked there after? - CORRECT ANSWER✔✔- 3 moths
To what accuracy should the scales for weighing cement , pozzolan, slag and aggregates at
the plant be maintained - CORRECT 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: - CORRECT ANSWER✔✔- 90
minutes
If a load of concrete has been rejected due to excessive slump, the concrete may remain in the
transporting vehicle to reduce the slump. - CORRECT ANSWER✔✔- Is not allowed.
Who places the orders for concrete with the producer? - CORRECT ANSWER✔✔- The
contractor
The minimum normal sampling frequency for the chloride content of structural concrete is: -
CORRECT ANSWER✔✔- 1 per design mix in use from the first day of production and
every 30 calendar days or less thereafter.
In what moister condition are the aggregates on the approved concrete mix designs? -
CORRECT ANSWER✔✔- SSD condition
The specific gravity of an aggregate is the ratio of its unit weight to the weight of an equal
absolute volume of: - CORRECT ANSWER✔✔- Water
What is the weight of a bag of Portland cement in the USA? - CORRECT ANSWER✔✔- 94
lbs
What is the maximum concrete temperature allowed when using a hot weather design mix? -
CORRECT ANSWER✔✔- 100 degrees F
