1-34. The device that is inserted in the heat  exchanger’s  water  box  to concentrate  electrolytic  action  to it vice to the metal of the heat exchanger’s tubes is made of what material  (s)? 1. Zinc  cathode 2. Zincs  only 3. Zinc  anode  only 4. Both 2 and 3 above 1-35. Who is the best qualified person on board  to  determine  the  overall condition  of  the  cooling  system? 1. Engineering  officer 2. Electronics  material  officer 3. System’s test officer 4. Ship’s  maintenance  technician 1-36. The  expansion  tank  sight  glass 1-37. 1-38. 1-39. 1-40. should normally read in what range? 1. 1/4 to 1/2 full 2. 1/3 to 2/3 full 3. 1/2 to 3/4 full 4. 2/3 to 4/5 full The low-level alarm switch is usually set at 20 percent of tank capacity.  The  alarm  will  initially sound  when  the  distilled  water level reaches which of the following  levels? 1. 5 percent of full 2. 10 percent of full 3. 15 percent of full 4. 20 percent of full What  term  best  describes  the  word makeup  water? 1. Distilled  water 2. Seawater 3. Potable  water 4. Chilled  water When, if ever, may potable water be used  in  electronic  cooling  systems? 1. After chloride is added 2. Only as makeup water 3. As  a  replacement  for  chilled water 4. NEVER What  is  the  maximum  permissible chloride that may be used in cooling  system  water? 1. 6.5 epm 2. 0.65 epm 3. 0.065 epm 4. 0.0065  epm What is an indication that the 1-41. 1-42. 1-43. 1-44. 1-45. 1-46. 1-47. duplex  strainer  is  clogged? 1. The pressure reading will be 5 to 10 psi below a clean basket reading 2. The pressure reading will be 5 to 10 psi above the clean basket  reading 3. The water temperature will be 5 to 10 degree below normal 4. The water temperature will be 5 to 10 degree above normal If the pressure drop is less than that of a clean basket reading, the basket may be missing. 1. True 2. False The  three-way  temperature regulating valve is used where seawater  is  the  primary  cooling medium, and the two-way valve is used where chilled water is the primary cooling medium. 1. True 2. False The basic operation of both the two-way  temperature  regulating valve is the same as the three-way temperature  regulating  valve  except that the two-way valve has a manual override feature. 1. True 2.  False Temperature  regulating  valve corrective  maintenance  consists only of visual checks for leaks and corrosion. 1.  True 2.  False Which of the following devices is used to regulate flow in a seawater cooling  system? 1. The gate valve 2. The globe valve 3. The orifice plate 4. The relief valve Which of the following flow regulators is used to regulate flow in the chilled water system? 1. The globe valve 2. The orifice plate 3. The variable orifice 4. The equipment-flow regulator 4