4-11.  The  five  phases  of  a  ship’s  damage control  firefighting  and  defense include  the  firemain  system, communication  equipment,  watertight closures,  ventilation  systems,  and what other systems? 1.  Hydraulic  systems 2.  Electrical  systems 3.  Water  cooling  systems 4.  Propulsion  systems 4-12.  Which  of  the  following  types  of firemain  systems  is  generally  found aboard  small  ships? 1. Horizontal-loop 2. Single-main only 3. Vertical-loop only 4.  Single-main  and  vertical-loop 4-13.  What  type  of  firemain  system  consists of  two  mains  installed  on  the  damage control  deck  and  is  separated athwartships? 1.  A  composite  firemain  system 2.  A  horizontal  firemain  system 3.  A  straight  firemain  system 4.  A  vertical  firemain  system 4-14.  When  is  the  watertight  integrity  of  a naval  ship  established? 1. Prior to getting under way 2.  At  sea 3. Prior to general quarters 4.  When  the  ship  is  built 4-15.  What  is  the  primary  means  of  smoke  and gas  removal  during  post  fire conditions? 1. Back-up air supply systems 2.  Installed  ventilation  systems 3. Natural ventilation 4.  Portable  ventilation  systems 4-16.  What  is  the  key  to  successful  damage c o n t r o l? 1.  Firefighting 2.  Flood  control 3.  Organization 4.  Manpower  availability 4-17.  Preventive  and  corrective  actions  are vital  to  damage  control. 1.  True 2.  False 4-18.  What  damage  control  organization includes  damage  control  central (DCC)? 1.  Administration 2. Battle 3.  Communication 4.  Firefighting 4-19.  Ship  fire  parties  are  divided  into which  of  the  following  types? 1.  Inport  and  at-sea 2.  Large  and  small 3. Normal and emergency 4.  Quick  response  and  delayed  action 4-20.  Which  of  the  following  is  NOT  a primary  firefighting  agent  used aboard  naval  ships? 1. C0₂ 2. PKP 3. Steam 4. Sand 4-21.  Which  of  the  following  fire  fighting agents  is  a  clear  to  slightly  amber- colored  liquid  concentrate? 1. AFFF 2. Aqueous Potassium Carbonate 3. Halon 4. Water 4-22. C0₂ is  about  how  many  times  heavier than  air? 1 .   1 .0 2. 1.5 3 .   2 .0 4 .   2 .5 4-23.  Air  diluted  with  CO₂ will   extinguish a fire below what prescribed percent of  oxygen? 1. 12% 2. 15% 3. 18% 4. 21% 22