Concrete Batch Plant Operator Exam (FDOT) – Verified Questions and CORRECT ANSWER s – Graded A+
Question : Stockpiles of aggregate shall be maintained in a
well-drained condition in order to:
CORRECT ANSWER : Minimize Free Water Content
Question : Coarse aggregate stockpiles must be sprinkled for
at lest how many hours prior to batch for FDOT?
CORRECT ANSWER : 24
Question : 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.
Question : 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
Question : For drill shaft concrete, the quantity of cement
replaced with fly ash shall be:
CORRECT ANSWER : 33 thru 37%
Question : In concrete, which material has a specific gravity
of one?
CORRECT ANSWER : Water
Question : What is the air content range for all classes of
structural concrete except Class IV Shaft?
CORRECT ANSWER : 1.00 thru 6.00%
Question : When can unmetered water be added to the
concrete?
CORRECT ANSWER : Not at all.
Question : Do not allow the total number of revolution at
mixing speed to exceed:
CORRECT ANSWER : 160 Revolutions
Question : 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
Question : When the water meters / scales are calibrated, prior
to production, at what frequency should they be checked there after?
CORRECT ANSWER : 3 moths
Question : 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
Question : 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
Question : 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.
Question : Who places the orders for concrete with the
producer?
CORRECT ANSWER: The contractor
Question : 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.
Question : In what moister condition are the aggregates on the
approved concrete mix designs?