6-9. 6-10. 6-11. 6-12. 6-13. What  are  the  characteristics  of the  movement  of  materials  within a  continuous-flow  plant  pugmill? 1 They are confined in the mixer  chamber 2. They  are  propelled  toward discharge 3. They are continuously mixed in the mixer chamber 4. They  are  continuously  mixed, weighed, then discharged What period of time begins when  all  the  combined  mineral aggregates  are  in  the  mixer and ends when the gate is open? 1. The  total  mixing  time 2. The wet mixing time 3. The dry mixing time 4. The  shortest  mixing  time What period of time starts with the  asphalt  application  and  ends with  the  opening  of  the  discharge gates? 1. The  total  mixing  time 2. The wet mixing time 3. The dry mixing time 4. The  shortest  mixing  time What environmental condition makes asphalt film harden on the  aggregates? 1. Exposure to air 2. Exposure  to  moisture 3. Exposure to heat and air 4. Exposure to moisture and air Which of the following is NOT a  part  of  the  automatic  control system  for  a  continuous-flow plant? 1. Burner  controls 2. Mix  discharge 3. Dryer  control 4. Mixer and gradation cutoffs Learning  Objective:  Recognize the  operational  processes  of a drum-mix asphalt plant. 6-14. 6-15. 6-16. 6-17. 6-18. 6-19. In a drum-mix plant, in what location  is  aggregate  mixed with  the  asphalt? 1. In the mix surge silo 2. In  the  hot-mix  conveyer 3. In  the  dust  collector 4. In the dryer The drum-mix plant gradation control  unit  proportions  all the  aggregate  before  it  enters the mixing drum. 1. True 2. False What factor is the basis for determining  the  quantity  of asphalt  delivered  into  the  drum? 1. The  weight  of  the  aggregate 2. The  gradation  of  the  aggregate 3. The drum-mix output requirement 4. The speed of the in-line belt feeder What section in a drum-mixer heats  and  dries  the  aggregate? 1. Primary 2. Intermediate 3. Secondary 4. Third What condition creates an oily coating  on  the  aggregate particles? 1. Aggregate not heated 2. An  unbalanced  distribution of  asphalt 3. A lack of balance in the burner  operation 4. Drum-mixer  speed  is  too  slow The  drum-mix  plant  produces  a batch-flow  of  asphalt  that  can be temporarily stored in the surge silo. 1. True 2. False 42