5-32. Material from the hydrocone crusher  is  recirculated  to  the top  screen  by  what  components? 1. The return conveyer and the revolving  elevator  wheel 2. The under conveyer and a drop chute 3. The under conveyer and the revolving  elevator  wheel 4. The return conveyer and a crossover  chute 5-33. The desired performance of a specific  screen  is  obtained by taking which of the follow- ing  actions? 1. Varying the degree of inclination 2. Varying the frequency and  amplitude  of  stroke 3. Varying the direction of throw 4. All of the above 5-34. Which of the following is NOT a factor that affects the operational  efficiency  of  a conveyer? 1. Speed 2. Length  of  travel 3. Loading 4. Incline 5-35. What  factor  determines  the capacity  of  a  washing  and screening  plant? 1. Water  pressure 2. Speed of the dehydrator 3. Percent of sand in the deposit 4. Capacity of the scrubber Learning  Objective:  Recognize crusher  supervisor  responsi- bilities  for  developing  the layout  and  erection  of  a  crusher plant. 5-36. When you are developing a layout of a plant,   special  attention  must be given to creating a logical flow of material. 1. True 2. False 5-37. Which of the following materials can  contaminate  open  stockpiles of  aggregate? 1. Windblown sand 2. Fines 3. Trash 4. All of the above 5-38. When  you  are  building  stockpiles, which  of  the  following  pieces  of equipment  is  more  efficient because  it  can  combine  lift  with push to build higher piles? 1. Dozer 2. Clamshell 3. Loader 4. Excavator 5-39. Which  of  the  following  physical characteristics  should  the  site selected for the erection of a plant  have? 1. Flat 2. Level 3. Well compacted 4. All of the above 5-40. When  torquing  bolts  and  nuts  on the plant, you do so by torquing the bolt head. 1. True 2. False 36