10–50  . On the earth auger, the auger head is attached to the drill shank by square-drive  pin  connectors. 1. True 2. False 10-51. In addition to keeping the drill hole alignment straight, the pilot cutter on an auger serves what other  function? 1. 2. 3. 4. Protects the drill head from overheating Makes  cutting  easier  with larger  auger  heads Acts as a safety link between the cutting edge and auger shank Makes it easier to change drill  heads 10-52. Before  performing  any  drilling  or boring  operations,  you  must  have a digging permit and have all underground  utilities  and obstructions  clearly  marked  and identified. 1. True 2. False Learning  Objective: Recognize the  principles  of  compressed  air equipment and tools. 10-53. Most compressors used in the Naval Construction  Force  are  governed  by a  pressure  control  system  that  is adjusted to compress air to a maximum  pressure  of  how  many pounds  per  square  inch  (psi)? 1. 90 2. 100 3. 150 4. 200 10-54. All  reciprocating,  rotary,  and screw  compressors  are  classified as one of what two types? 1. Either fast or Slow acting 2. Either  double  or  triple  stage 3. Either single stage or multistage 4. Either  portable  or  non– portable 10-55. A  multistage  air  compressor  system is more efficient than a single- stage system because the air cooled  between  stages  in  the multistage  provides  what advantage? 1. Increases  the  temperature of the compressed air 2. Reduces  buildup  of  pressure due  to  temperature  rise 3. Has the capacity to hold more air at a higher pressure 4. Compresses   the air to one thousandth  of  its  original size 10-56. To supply compressed air over a distance of more than 200 feet for hand tool operations, you must use what  attachment? 1. An air manifold 2. A number 4 coupler 3. A larger diameter hose 4. A  smaller  diameter  hose 76