3-32. A worker should wear double hearing protection  when  working  around  noise sources  above  what  prescribed  sound l e v e l? 1. 94 dB 2. 100 dB 3. 104 dB 4. 140 dB 3-33. When protective devices do not provide noise  reduction  to  a  level  below  84 dB,  which  of  the  following  actions should  be  taken? 1.  Secure  noisy  equipment 2.  Reduce  exposure  time 3. Remove personnel from the area 4. Reduce the number of personnel operating  equipment 3-34.  Supervisors  and  visitors  who  are  in the  vicinity  of  eye-hazardous operations  are  required  to  wear protective  equipment, 1.  True 2.  False 3-35. In areas where personnel may be exposed  to  corrosive  materials,  which of the following items must be available? 1.  Protective  eyewear 2.  Eyewash  facilities 3. Warning signs 4.  Each  of  the  above 3-36.  Personnel  just  passing  through  an  eye hazard  area  do  NOT  need  eye  protection as long as they keep moving. 1.  True 2.  False 3-37.  Which  of  the  following  contaminants  is formed  from  condensation  of  vaporized s o l i d s? 3-38.  Which  of  the  following  contaminants results  from  the  incomplete combustion  of  coal,  wood,  and  oil? 1.  Fumes 2. Dust 3. Smoke 4.  Mist 3-39.  Fine  liquid  droplets  suspended  in  air by  condensation  or  atomization  will cause  which  of  the  following contaminants? 1. Fumes 2. Dust 3. Smoke 4.  Mist 3-40.  Small  solid  particles  created  by  the breaking  up  of  larger  particles  by machine  shop  tools  will  cause  which of  the  following  contaminants? 1.  Fumes 2. Dust 3. Smoke 4. Mist 3-41.  Which  of  the  following  methods affords  the  best  personnel  protection from  industrial  respiratory  hazards? 1. Exhaust ventilation systems 2. Airtight working spaces 3.  Surgical  masks 4.  Respirators 3-42.  When,  if  ever,    would a surgical mask be  considered  as  adequate  for industrial  respiratory  protection? 1.  During  fueling  operations 2.  While  using  cleaning  solvents 3.  While  spray  painting 4.  Never 3-43.  An  air-purifying  type  of  respirator can be used in a space that has insufficient  oxygen. 1. Fumes 2. Dust 3. Smoke 4. Mist 17 1.  True 2.  False