- | Page
CONCRETE BATCH PLANT
OPERATOR EXAM (FDOT) |
QUESTIONS & ANSWERS
(VERIFIED) | LATEST UPDATE |
GRADED A+
Question 1: Stockpiles of aggregate shall be maintained in
a well-drained condition in order to:
CORRECT ANSWER: Minimize Free Water Content
Question 2: Coarse aggregate stockpiles must be
sprinkled for at least how many hours prior to batch for FDOT?
CORRECT ANSWER : 24
Question 3: Free moisture of the aggregate means:
CORRECT ANSWER : Moisture on the surface of an
aggregate that is above and beyond the absorbed moisture in the aggregate
- | Page
Question 4: If the moisture test is done other than by the
cook-out method, how often shall the other methods be verified?
CORRECT ANSWER : Each week
Question 5: For drill shaft concrete, the quantity of
cement replaced with fly ash shall be:
CORRECT ANSWER : 33 thru 37%
Question 6: In concrete, which material has a specific
gravity of one?
CORRECT ANSWER : Water
Question 7: What is the air content range for all classes of
structural concrete except Class IV Shaft?
CORRECT ANSWER : 1.00 thru 6.00%
Question 8: When can unmetered water be added to the
concrete?
CORRECT ANSWER : Not at all
- | Page
Question 9: Do not allow the total number of revolutions
at mixing speed to exceed:
CORRECT ANSWER : 160 Revolutions
Question 10: 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 11: When the water meters/scales are calibrated,
prior to production, at what frequency should they be checked thereafter?
CORRECT ANSWER : 3 months
Question 12: To what accuracy should the scales for
weighing cement, pozzolan, slag, and aggregates at the plant be maintained?
- | Page
CORRECT ANSWER : 0.5% of maximum load
normally handled
Question 13: 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 14: 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 15: Who places the orders for concrete with the
producer?