9–53. What type of lead is connected to the boom tip through the use of lead  adapters? 1. Swinging 2. Underhung 3. Extended  four-way 4. Overhead 9-54. During  what  time  period  should lead adapter bolts be checked for tightness? 1. At the beginning of each day 2. At the beginning of each week 3. At the beginning of each month 4. At the beginning of each shift 9-55. What component is used to hold leads at a vertical for driving bearing piles or to hold the leads at an angle for driving batter piles? 1. A tag line winder 2. A  bridle  assembly 3. A catwalk 4. A boom mast 9-56. What type of lead uses a sliding boom  tip  connector  for  connecting the boom tip of the crane to the leads? 1. Swinging 2. Underhung 3. Extended  four-way 4. Overhead 9-57. What type of lead has an advantage over other leads because it bears the entire bottom of the pile cap to the piling? 1. Swinging 2. Spud 3. Extended  four-way 4. Underhung Learning  Objective: Recognize the  principles  and  components of  pile–driving  hammers. 9-58. 9-59. 9-60. 9-61. 9-62. 9-63. The noise generated by a pile– driving  operation  can  cause hearing loss. 1. True 2. False The DE-10 hammer is lifted and started by a single crane line connected  to  what  hammer  component? 1. Fuel pump assembly 2. Belleville  spring  assembly 3. Trip  mechanism 4. Thrust  bearing The  compression  of  the  trapped air in the DE-10 hammer creates a  preloading  force  upon  which of  the  following  components? 1. Anvil 2. Drive cap 3. Pile 4. All of the What  component is designed to above in the DE–10 hammer break or bend in the event the operator lowers the trip mechanism  to  low  during  hammering operations? 1. Dowel pin 2. Safety link 3. Throttle  shaft 4. Lifting hook On a diesel hammer, by gravity from the gasoline is fed main fuel tank through the filter cartridge. 1. True 2. False Lubricating oil for a diesel hammer should have a flash point of what degrees, in  Fahrenheit? 1. 225°F to 250°F 2. 325°F to 350°F 3. 425°F to 450°F 4. 525°F to 550°F 68