3-44.  The  OBA  can  be  used  for  which  of  the f o l l o w i n g   s i t u a t i o n s? 1.  Painting  a  void 2.  Sandblasting  a  void 3.  Fighting  a  fire  in  a  void 4. Each of the above 3-45.  Respirator  cartridges  use  which  of  the following  means  for  identifying  the type  of  contaminant  against  which  they are  useful? 1.  Color  codes 2.  Raised  letters 3.  Fluorescent  letters 4.  Alphanumeric  codes 3-46. Prolonged exposure of personnel to excessive  heat  and  humidity  while under  a  continued  work  load  can  result in  which  of  the  following  conditions? 1.  Heat  stress 2. Heat stroke 3.  Heat  exhaustion 4. Each of the above 3-47.  Voltages  of  115  and  below  are  very dangerous. 1. True 2.  False 3-48.  One  of  your  workers  reports  that  a typewriter  is  not  working  properly. Upon  inspecting  it,  you  notice  it  has a  frayed  plug. Which  of  the  following actions  should  you  take? 1.  Wrap  the  plug  with  insulation  tape and  allow  the  person  to  continue typing 2.  Have  the  person  stop  typing  and call  the  electric  shop  supervisor 3.  Put  a  rubber  mat  under  the  typist’s chair  and  allow  the  person  to continue  typing 4.  Wiggle  the  cord  until  the typewriter works and allow the person  to  continue  typing 3-49.  Navy  personnel  who  are  assigned  work in  construction  or  ship  repair  must obtain  safety  shoes  at  their  own expense. 1.  True 2.  False 3-50.  Hazardous  material  labels  are required  on  which  of  the  following items? 1.  Materials  with  a  flash  point  of 190°F 2. Materials that are unstable if heated 3.  Corrosive  materials  that  do  not burn 4.  Each  of  the  above 3-51.  Which  of  the  following  effects  is known to be caused by overexposure to rf  radiation? 1.  Loss  of  reproductive  ability 2.  Loss  of  muscle  tissue 3.  An  increase  in  body  temperature 4.  Each  of  the  above 3-52.  Safety  limitations  for  exposure  to  rf radiation have been established by the Naval Medical Command. These limits  are  based  on  which  of  the following   criteria? 1.  Beam  power  density  and  exposure time 2. Antenna size and exposure time 3.  Beam  power  density  and  proximity 4.  Antenna  size  and  proximity 3-53. While working near a radar antenna, you  accidentally  touch  a  guard  rail that  has  a  significantly  large induced  rf  voltage. You could suffer which  of  the  following  effects? 1.  Pain 2.  Skin  damage 3.  Involuntary  reflex  action 4.  Each  of  the  above 18