5-62. The grading of an individual cold aggregate is determined by taking what  action? 1. Matching a sample of aggregate with a previous marked sample 2. Running a sieve analysis 3. Measuring the rate of aggregate  to  the  fines 4. Noting the progressive thickness  of  the  fines 5-63. Which of the following factors control the time required for aggregate  to  pass  through  a  dryer? 1. The cylinder speed 2. The slope of the cylinder 3. The  length,  arrangements, and  number  of  flights 4. All of the above 5-64. When aggregate particles show signs of an oily coating after leaving  the  dryer,  you  should make  what  adjustment? 1. Decrease the amount of fuel oil 2. Decrease blower or draft air pressure 3. Increase  the  amount  of  fuel oil 4. Increase  the  amount  of  natural gas 5-65. What factor controls the temperature  of  an  asphalt  mix? 1. The temperature of the asphalt 2. The temperature of the dryer 3. The  temperature  of  the aggregates 4. The  temperature  of  the  pugmill 5-66. If not kept clean, which of the following  components  can  be  a serious  cause  of  air  pollution at an asphalt plant? 5-67. The Jet-Pulse system is used in an asphalt plant as a method to gain what  result? 1. Production of pulses of heat to keep aggregate hot 2. Production of suction pulses to control dust 3. Production of a pulse of pressure within a filter bag to dislodge “dust cake” 4. A method that produces a stream  of  hot  asphalt  onto aggregates 5-68. What factors determine the amount of dust from the dust collector that can be returned to the plant? 1. Moisture content 2. Degree of suspension efficiency 3. Mix specification 4. Separate  grading  of  the  finish mix 5-69. In the gradation control unit, which of the following screens is used as a scalping screen? 1. Top screen 2. Top intermediate screen 3. Bottom intermediate screen 4. Bottom screen 5-70. As associated with the gradation control unit, what does the term “carry-over”  mean? 1. Larger  aggregates  are misdirected to smaller aggregate  bins 2. Rejected aggregates are “carried-over”  to  a  discharge chute 3. Smaller  aggregates  are misdirected into the larger aggregate  bins 4. Improperly  heated  aggregates are  reheated 1. Screens 2. The dryer combustion unit 3. The dryer 4. The hopper 39