4-29. How  should  you  make  emergency  repairs  to 4-35. a leaky tube of a shell in a tube-type oil cooler? 1. Plug the tube at both ends with a special  plug 2. Plug the tube at both ends with a strip  of  neoprene 3. Seal  the  tube  with  soft  solder 4. Seal the tube with solder at the inlet  end  only 4-30. Shell-and-tube-type  heat  exchangers  are cleaned  by  which  of  the  following methods? 1. Air  lances,  steam  sprays,  or  chemical solutions 2. Steam  sprays  or  chemical  solutions only 3. Air  or  water  lances  only 4. Chemical  solutions,  air  lances,  or water  lances Learning  Objective:  Recognize  casualties pertaining  to  lubricating  systems  and point out how they may be avoided. Question 4-31 is to be judged True or False. 4-31. If you will use the proper type of lube oil in an engine lubricating oil system you  will  ensure  that  all  engine  parts receive  sufficient  lubrication. 4-32. Pressure  in  the  lubricating  system  is maintained by which of the following devices? 1. Relief  valves 2. External  relief  valves 3. Internal  pressure  regulating  valves 4. All of the above 4-33. Which  of  the  following  conditions indicate  a  broken  lube  oil  pump? 1. Smoke  rising  from  the  shaft 2. Abnormal  noise  in  the  pump 3. Sudden  increase  of  lube  oil pressure 4. Fluctuation  of  lube  oil  pressure 4-34. When  is  the  low-pressure  warning  device of a lube oi 1 system usually tested? 1. Every day 2. When  the  system  is  started  and secured 3. Only  when  the  system  is  started 4. Only  when  the  system  is  secured 4-36. 4-37. In  addition  to  temperature  and  pressure readings,    which  of  the  following  methods should  you  use  to  determine  if  a  bearing is  receiving  oil? 1. After  shutdown,  inspect  bearings  to determine  the  pressure  of  the  oil 2. After  shutdown,  place  you  hand  on  a bearing  to  note  the  temperature 3. Both 1 and 2 above 4. Blow  air  through  lube  oil  passages Which  of  the  following  materials  should you  use  when  cleaning  an  engine  lube  oil sump? 1. Cotton  waste 2. Paper towels 3. Lintfree  cloths 4. All of the above You  have  removed  an  oil  filter  line  from an engine. Before reinstalling, the line should  be  cleared  of  any  obstructions with 1. diesel  oil 2. compressed  air 3. low-pressure   steam 4. freshwater  lances Learning  Objective:  Explain  the operational  characteristics  of  fuel injection  equipment  and  engine controls.  Recognize  symptoms  of fuel  injection  trouble  and  their causes,    and  indicate  what  corrective measures  may  be  required. 4-38. Regardless  of  design,  under  which  of  the following  conditions  should  solid  fuel injection  systems  deliver  the  fuel  oil  to each  engine  cylinder? 1. At a high pressure 2. In the correct amounts 3. At the proper time 4. All of the above 4-39. What  are  the  two  general  types  of  solid fuel  injection  systems? 1. Unit  injection  and  common  rail 2. Jerk  pump  and  common  rail 3. Individual  pump  and  jerk  pump 4. Unit  injection  and  individual  pump 25