8-46. Aboard Navy ships, in which of the following  situations  would  you  most likely use HP air? 1. To  clean  machinery 2. To  start  diesel  engines 3. To  operate  pneumatic  tools 4. Each  of  the  above 8-47. Which of the following statements about general  procedures  for  maintaining  air compressors  is  true? 1. The  same  procedures  are  used  for  low, medium,    and high pressure systems except for the additional safety precautions which are observed in caring for high pressure compressors 2. The procedures vary with the type of compressed air system, compressor design, and compressor capacity 3. The procedures are the same for low and medium pressure systems, but for high pressure systems they vary with compressor design and capacity 4. The procedures for low, medium, and high pressure systems made by one manufacturer differ from the procedures used for the systems made by another manufacturer Question 8-48 is to be judged True or False. 8-48. Good engineering practice in making repairs is to use the proper tools and to observe all safety precautions and manufacturers'  instructions. 8-49. What may be expected when a wrench extension is used to apply more than the specified torque on bolts in order to obtain a tight connection at a gasket joint? 1. Sprung  gasketed  joints 2. Damaged  gaskets,  bolts  twisted  off, and/or insufficient tightness of the joint 3. Either 1 or 2 above 4. Tight  joints 8-50. Which of the following statements describes  the  recommended  procedures  for cleaning  an  oil  wetted  filter  element that was removed from a compressor intake? 8-51. 1. Clean with gasoline or kerosene, dip in  lightweight  oil,  and  drain  excess oil 2. Clean with steam or strong sal soda solution,  dip  in  clean  medium viscosity  oil,  and  drain  excess  oil 3. Clean with a jet of hot water, dip in kerosene,  and  drain  excess  kerosene 4. Clean with kerosene, drain excess kerosene,    dip  in  medium  viscosity oil,  and  drain  excess  oil How is moisture prevented from circulating  throughout  the  air  system? 1. By  preheating  the  inlet  air 2. By  blowing  down  the  compressor  inter- coolers 3. By  placing  coalescent  filters  in  the compressor  discharge  line 4. By  preheating  the  inter-coolers Question 8-52 is to be judged True or False. 8-52. In  a  two-stage  compressor  a  defective inlet  valve  in  the  second  stage  may  be indicated  by  an  increase  in  the inter-cooler  pressure,  and  a  defective discharge  valve  in  the  first  stage  may  be indicated  by  a  decrease  in  the inter-cooler   pressure. 8-53. Leakage  through  the  discharge  valves  of an air compressor is usually caused by which of the following factors? 1. Dirt  in  the  valves 2. Moisture  in  the  air 3. Overcompression  of  air  in  the cylinders 4. Insufficient  compression  of  air  in the  cylinders 8-54. How  can  you  reduce  the  frequency  with which air valve troubles occur or possibly prevent them from occurring? 1. By  keeping  the  pressure  high  in  the intercooler 2. By  inspecting  and  cleaning  the  valves and the valve passages regularly 3. By periodically circulating high temperature  air  around  the  valves 4. By  periodically  blowing  off  the  valve cover  to  keep  it  from  becoming  too hot 53