8-43. What term is used to describe the operation  of  removing  brush,  trees, and  rubbish  from  a  designated  area? 1. Bulldozing 2. Stumping 3. Clearing 4. Ditching 8-44. What  size  diameter  tree  is considered  a  large  tree? 1. 4 inches 2. 6 inches 3. 8 inches 4. 10 inches 8-45. Making  contact  or  releasing pressure on a tree with a dozer should  be  performed  quickly  and smoothly to avoid any shock to the tree. 1. True 2. False 8-46. Punctured  radiators,  broken 8–47. 8-48. hydraulic  lines,  and  damaged exhaust  stacks  are  common  types of  equipment  damage  that  occurs when  clearing  brush  and  trees? 1. True 2. False What is the most effective piece of  equipment  for  removing  rocks and  boulders? 1. A dozer with a tilted blade 2. A rock drill 3. A  forklift 4. A  jackhammer What  action  should  an  operator perform  to  increase  the  digging action  of  a  straight-blade  dozer working  in  hard  ground? 1. Tilt the top of the blade rearward 2. Tilt the top of the blade forward 3. Angle the blade to the left 4. Angle the blade to the right 8-49. What is the maximum working distance for a medium-size dozer? 1. 100 feet 2. 200  feet 3. 300 feet 4. 400  feet 8–50. Side–by–side  dozing  is  impractical for hauls of less than what distance? 1. 50  feet 2. 40 feet 3. 30  feet 4. 20  feet 8-51. Slot  dozing  can  increase  production up  to  what  percentage? 1. 50% 2. 40% 3. 30% 4. 20% 8-52. What term is used to describe the process  of  replacing  excavated earth? 1. Spreading 2. Finishing 3. Backfilling 4. Ditching 8–53. A  sidehill  excavation  can  be started  more  easily  if  what type of cut is made first? 1. Ditch 2. Bench 3. Slope 4. Slot 8–54. What  position  should  the  dozer blade be in when backing away from the edge of soft fills? 1. As high as possible 2. As low as possible 3. In the float position 4. Angled 60