question archive 1) How is the gradation controlled in a drum mix plant? a
1) How is the gradation controlled in a drum mix plant? a
Subject:ManagementPrice: Bought3
1) How is the gradation controlled in a drum mix plant?
a. By adjusting the batch weights
b. The gradation cannot be adjusted
c. By adjusting the cold feed gates.
2. Aggregate is carried from the dryer to the screens by the _________.
a. cold elevator
b. hot elevator
c. overflow chute
3. Some batch plants do not have asphalt scales. Instead the asphalt is measured by a device
called a:
a. weigh bucket
b. lifting flight
c. fluidometer
4. The hot mix asphalt produced at a batch plant contains too much fine aggregate. Carry-
over is suspected to be the cause. Where is the best place to take a sample to find out if
carry-over really is the cause?
a. from the truck
b. from the hot bins
c. from the cold feed gates
5. If a hot bin runs dry, it is an indication that:
a. the aggregate is not dry
b. the production rate is too low
c. the cold feed is out of balance
6. Asphalt storage tanks are required by the specifications to be:
a. insulated
b. equipped with a double set of steam coils
c. at least 250 gallon capacity
7. In which type of plant is the asphalt added in the dryer?
a. batch plant
b. drum mix plant
c. both of the above
8. Automated batch plants, with digital printout, are not required to have which of the
following?
a. cold bins
b. hot bins
c. truck scales
9. High moisture content can cause a paving mix to appear to have:
a. too much aggregate
b. too much asphalt
c. not enough asphalt
10. Ten 50-pound test weights are placed on an asphalt scale. The dial reads 505 pounds.
The scale error is which of the following?
a. 1.0%
b. 0.1%
c. 10.0%
11. Trucks that haul hot mix asphalt are required to have which of the following?
a. A canvas cover
b. An aluminum bed
c. At least five axles
12. Asphalt lines must be heated because:
a. Cold asphalt will not coat the aggregate.
b. The asphalt will solidify and clog the lines.
c. Both of the above.
13. The return line, which carries the asphalt back to the storage tank, should discharge
below the surface of the asphalt. Why?
a. To protect the hot asphalt from oxygen in the air.
b. To keep the tank from overflowing.
c. Both of the above.
14. On a batch plant, where is the asphalt added?
a. The hot bins
b. The weigh hopper
c. The mixer
