4-46. 4-47. 4-48. 4-49. 4-50. 4-51. Which   of   the   following   tools   are used   in   boiler,   locomotive,   and railroad   shops   for   tapping   holes   in the   outer   and   inner   plates   of boilers? 4-52. To   enlarge   and   true   a   hole,   you should   use   which   of   the   following tools? 1.   Breast   drills 2.   Precision   gage   blocks 3.   Staybolt   taps 4.   Vernier   calipers 1.   A   scriber 2.   A   vernier   caliper 3.   A   reamer 4.   A   jeweler's   hammer 4-53. What   are   the   three   parts   of  a reamer? Rethreading   dies   are   used   for   which of   the   following   purposes? 1.   To   start   tapping   operations 2.   To   restore   bruised   or   rusty threads   on   screws   and   bolts 3.  To  remove  threads  from  screws and   bolts 1.   Body,   stem,   and   flange 2.   Body,   shank,   and   blades 3.   Blades,   flange,   and   rim 4. Shank,   flange,   and   wheel 4-54. Where   can   you   find   the   size   of  a reamer? 4.   To   make   threads   on   the   inside of   nuts 1.  Stamped  on  the  shank  of  the t o o l The   two-piece   collet   die   consists of   two   die   sections. What  are  the two   sections   called? 2.   Stamped   between   the   blades   of t h e    t o o l 3.   Painted   on   the   body   of   the   tool 4.   Scribed   on   the   body   of   the   tool 1.   The   collet   nut   and   collet   bolt 2.   The   collet   screw   and   collet washer 4-55. Solid   taper-pin   reamers   are   made with   what   standard   taper? 3.   The   collet   groove   and   collet ridge 4.   The   collet   cap   and   collet   guide The  mud  or  washout  tap  has  a  total of  how  many  threads  per  inch? 1. 12   threads   per   inch 2. 15   threads   per   inch 3. 18   threads   per   inch 4. 20   threads   per   inch Tapered   boiler   taps   have   tapered diameters   that   increase   at   what rate? 1. 3/4   inch   per   foot 2. 1/2   inch   per   foot 3. 1/4   inch   per   foot 4. 1/8   inch   per   foot 4-56. An  expansion  reamer  is  made  from which   of   the   following   materials? 1. Plastic 2.   Carbon   steel 3.   Copper 4.   Lead 1. 1/8   inch   per   foot 2. 1/4   inch   per   foot 3. 1/2   inch   per   foot 4.   3/4   inch   per   foot 4-57. Solid   taper-pin   reamers   come   with which   of   the   following   types   of flutes? Thread   cutter   sets   contain   which   of the   following   items? 1. Straight   flutes   only 2. Spiral   flutes   only 3. Straight   and   spiral   flutes 4. Square   flutes 1.   Taps,   dies,   and   diestocks 2.   Tap   wrenches,   guides,   and screwdrivers 3.   Wrenches   for   making   adjustments 4.   All   of   the   above 23