9–32. A  fairlead  performs  what  function during  crane  operations? 1. Keeps  the  clamshell  from twisting 2. Guides the drag cable onto the hoist drum 3. Guides  the  boom  hoist  cable through the gantry 4. Supports  the  pile  hammer during  pile–driving  operations 9-33. A  drag  cable  should  be  lubricated each  time  operator  maintenance  is performed on a crane. 1. True 2. False Learning  Objective: Recognize  the principles  of  crane  operations. 9-34. What factor is the cause of most crane  mishaps? 1. Mechanical  error 2. Operator  error 3. Natural  disasters 4. Design  flaws 9-35. Which  of  the  following COMSECOND/COMTHIRDNCBINST    provides guidelines  for  wire  rope  slings  and rigging  hardware  used  in  the  NCF? 1. 11200.8 2. 11200.9 3. 11200.11 4. 11200.22 9-36. Before  receiving  a  license  to operate  a  crane,  operators  are required to attend what total number  of  hours  of  formal  classroom instruction? 1. 8 2. 16 3. 32 4. 40 9-37. It is very dangerous for personnel to control crane suspended loads by their hands instead of a tag line. 1. True 2. False 9–38. Which of the following personnel has  the  ultimate  responsibility for a crane lift? 1. The  signalman 2. The  operator 3. The oiler 4. The  rigger 9-39. Which of the following forms is used  when  performing  crane  prestart inspections and is turned in to the crane crew supervisor at the end of each day or shift for reviewing and signing? 1. An  ODCL 2. A hard card 3. An  Operator’s  Inspection  Guide 4. An  Operator’s  Daily  PM  report 9–40. Wire rope should be replaced when wear  has  destroyed  what  fraction of the original diameter of the outside  individual  wires? 1. 1/8 2. 1/3 3. 1/2 4. 2/3 9-41. Which of the following sockets can develop only 70 percent of the breaking  strength  of  the  wire  rope? 1. Swage  socket 2. Cappel  socket 3. Spelter  socket 4. Wedge  socket 9–42. “Two-blocking”   means  hoisting  the hook  block  sheaves  against  the  boom tip  sheaves. 1. True 2. False 66