12-53. Before the burners are lit on a distributor  truck,  the  flues  must be covered by a total of how many inches  of  material? 1. 3 inches 2. 6 inches 3. 9 inches 4. 12 inches 12–54. Which  of  the  following  actions should you take to prevent the distributor  pump  and  circulation system  from  clogging  up  because  of bitumen  setting  up  and  hardening in the system? 1. When  used,  you  should  flush out  the  pump  and  circulating system at the end of the day 2. Flush out the pump and circulating  system  at  least once a week 3. Wash the outside of the pump with  solvent  weekly 4. Circulate  bitumen  through  the pump daily 12–55. What is the storage capacity of an  asphalt  kettle? 1. 15 gallons 2. 50 gallons 3. 100 gallons 4. 165  gallons 12–56. Which  of  the  following  conditions can  develop  if  emulsified  asphalt is left in a distributor truck for any great length of time? 1. The  emulsified  asphalt  can become  highly  flammable 2. The  emulsified  asphalt  will separate and set in much less time than cutbacks 3. The  emulsified  asphalt  will expand and damage the tank 4. The  emulsified  asphalt  will evaporate  resulting  in  the loss of material 12–57. To  prevent  sticking,  you  must  take what action to prepare the bed of a  dump  truck  before  loading  hot– mix asphalt into it? 1. Spray the bed with water 2. Lay a light coat of sand in the bed 3. Coat the bed with a release agent  (lubricant) 4. Lay a plastic covering in the bed 12–58. Which  of  the  following  factors should  be  considered  when  planning the number of trucks required for an asphalt plant? 1. The  mix  production  rate of the plant 2. The length of the haul 3. The type of traffic encountered 4. All of the above 12-59. An end–dump truck must be inspected to ensure the rear of the dump bed overhangs the rear wheels  enough  to  discharge  the hot-mix  asphalt  into  the  paver hopper. If the dump bed does not,   what  action  should  you  take? 1. Do not use the truck 2. Shovel the material by hand into the hopper 3. Add an apron with side plates to increase the overhang of the dump bed 4. Raise the dump bed only halfway 12-60. When  positioning  a  dump  truck  to dump a hot-mix asphalt into a paver, you must ensure the truck is squarely against the paver and the truck tires are in what position in relation to the roller bar on the paver? 1. A few inches away 2. Squarely  against  the  roller 3. At least 1 foot away 4. Bumped against the roller bar 94