CONCRETE BATCH PLANT OPERATOR
EXAM (FDOT) QUESTIONS AND
ANSWERS
Plant personnel must check the mixer for which of the 5 items? - Answer-1. Truck Drum
Condition
2. Water Gauge
3. Manufacturer's Rating Plate
4. Mixer Blade Wear
5. Revolution Counter.
What is re-tempered concrete? - Answer-Concrete that has water added after it initially
starts to set
An accumulation of hardened concrete in a mixer drum may cause: - Answer-
Inadequate mixing
Who must demonstrate thru examination, adequate concrete related knowledge and
sign concrete delivery tickets? - Answer-Concrete Batch Plant Operator
A design mix indicates that the amount of coarse aggregate to be used is 1,056 lbs/yd3
using pit #87-020 with a specific gravity of 2.46 and the specific gravity changes to 2.49.
How much coarse aggregate should be used to maintain the same volume? - Answer-
1,069 lbs/yd3
If the batch weight equals 3,810 and the yield is 27 ft3 what is the unit weight? -
Answer-141.1 lbs/ft3
What is the water-cementitious ration (w/cm) of a concrete mix that contains 550 lbs/yd3
of cement, 120 lbs/yd3 of fly ash and 35 gal/yd3 of water? - Answer-0.44
A batch of sand is 1,310 lbs. If a 1,050 gram sample from the batch weighs 966.4 grams
when oven dried, weights do not include the pan. How many pounds of dry sand are
there? - Answer-1206
What type of of cement is used in for all mass concrete elements? - Answer-Type II
(MH)
The minimum normal sampling frequency for the chloride content of structural concrete
is: - Answer-1 per design mix in use from the first day of production and every 30
calendar days or less thereafter.
EXAM (FDOT) QUESTIONS AND
ANSWERS
Plant personnel must check the mixer for which of the 5 items? - Answer-1. Truck Drum
Condition
2. Water Gauge
3. Manufacturer's Rating Plate
4. Mixer Blade Wear
5. Revolution Counter.
What is re-tempered concrete? - Answer-Concrete that has water added after it initially
starts to set
An accumulation of hardened concrete in a mixer drum may cause: - Answer-
Inadequate mixing
Who must demonstrate thru examination, adequate concrete related knowledge and
sign concrete delivery tickets? - Answer-Concrete Batch Plant Operator
A design mix indicates that the amount of coarse aggregate to be used is 1,056 lbs/yd3
using pit #87-020 with a specific gravity of 2.46 and the specific gravity changes to 2.49.
How much coarse aggregate should be used to maintain the same volume? - Answer-
1,069 lbs/yd3
If the batch weight equals 3,810 and the yield is 27 ft3 what is the unit weight? -
Answer-141.1 lbs/ft3
What is the water-cementitious ration (w/cm) of a concrete mix that contains 550 lbs/yd3
of cement, 120 lbs/yd3 of fly ash and 35 gal/yd3 of water? - Answer-0.44
A batch of sand is 1,310 lbs. If a 1,050 gram sample from the batch weighs 966.4 grams
when oven dried, weights do not include the pan. How many pounds of dry sand are
there? - Answer-1206
What type of of cement is used in for all mass concrete elements? - Answer-Type II
(MH)
The minimum normal sampling frequency for the chloride content of structural concrete
is: - Answer-1 per design mix in use from the first day of production and every 30
calendar days or less thereafter.
