ASSIGNMENT 7 Textbook  Assignment: “Front-End  Loaders,  Excavators,  and  Ditchers”  and  “Graders  and Scrapers,”    pages  9-11  through  10–19. Learning  Objective: (continued) Recognize  the  principles  of  loader operations. 7-1. Which  of  the  following  loader operational  techniques  provides greater  force  and  penetration  to loosen  large  rocks? 1. Squeezing the tip of the rocks  with  the  clamshell 2. Digging  under  the  rocks with the bucket 3. Dozing  under  the  rocks with the blade 4. Back  dragging  the  rocks with  the  clamshell 7-2. What  action  should  a  loader operator  take  when  loading  large rocks  into  dump  trucks? 1. Drop small rocks in the dump bed to cushion the large rocks 2. Gently load the large rocks from  the  lowest  possible  height 3. Place a load of dirt or sand in the dump bed to cushion the large rocks 4. Load in the center of the dump bed with the clamshell 7–3. Improper  loading  techniques  with a  multipurpose  bucket  can  cause unnecessary damage to the bucket. 1. True 2. False Learning Objective: Recognize  the principles  of  backhoe  operations. 7-4. The digging depth of a backhoe attachment  is  limited  by  what components? 1. Bucket size and length of dipper  stick 2. Length of boom and dipper stick 3. Bucket size and length of boom 4. Backhoe  coupling  and  positive hydraulic  pressure 7-5. What  type  of  fitting  allows  the easy  attachment  of  the  backhoe to the loader? 1. Quick  disconnect  hydraulic fittings 2. Manual  connect  hydraulic fittings 3. Forced  driven  hydraulic fittings 4. Screw  pin  hydraulic  fittings 7–6. After the backhoe is attached to the 515 dresser loader, the operator  should  raise  the  boom  arm until the boom arm pivot point is approximately  how  many  inches  from the  ground? 1. 6 2. 15 3. 20 4. 36 7–7. Which  of  the  following  problems results  from  setting  the  engine throttle in excess of that set for  backhoe  operations? 1. Creates  excessive  engine temperatures 2. Creates excessive digging pressure 3. Creates  excessive  hydraulic temperatures 4. Creates  excessive  boom  swing 48