2-21. A   right   angle   is   what   number   of degrees? 1. 30   degrees 2.    60   degrees 3.    75   degrees 4.    90   degrees 2-22. Which   of   the   following   tools   is used   for   testing   bevels   and   laying out   angles? 1.   A   plumb   bob 2.   A   climbing   tool 3.  A  mattocks 4.   A   T-bevel 2-23. To   transfer   measurements   to   work and   to   indicate   the   parallelism   of surfaces,   you   should   use   which   of the   following   tools? 1.   A   dial   depth   gage 2.   A   vernier   depth   gage 3.  A  surface  gage 4.  A  micrometer  depth  gage 2-24. Which   of   the   following   tools   is used  to  measure  the  depth  of holes,   slots,   counterbores,   and recesses? 1.  A  snap  gage 2.  A  telescoping  gage 3.  A  two-piece  collet  die 4.  A  rule  depth  gage 2-25. In   reference   to   a   vernier   depth gage,   which   of   the   following statements   is/are   true? 1.   It   consists   of   a   graduated scale   that   is   either   6   or   12 inches   long 2.   It   has   a   sliding   head   that   is designed   to   bridge   holes   and slots 3.   It   cannot   enter   holes   less   than 1/4   inch   in   diameter 4.   All   of   the   above 2-26. Which   of   the   following   tools   can be  used  to  measure  the  thickness of   paint? 1.   A   dial   depth   gage 2.   A   rule   depth   gage 3.  A  machinist's  level 4.   A   master   precision   level 2-27. Height   gages   are   normally graduated   in   which   of   the following    divisions? 1. .015   inch 2.    .025   inch 3.    .500   inch 4. .750   inch 2-28. In   reference   to   a   surface   plate, which   of   the   following   statements is/are   true? 1.   A   surface   plate   provides  a true,   smooth,   plane   surface 2.   A   surface   plate   is   often   used as   a   level   base   for   surface   and height  gages  from  which  to  make accurate measurements 3.   A   surface   plate   is   usually   made of   close   grained   cast   iron   and is   rectangular   in   shape 4.   All   of   the   above 2-29. In   reference   to   ring   gages,   which of   the   following   statements   is true? 1.  GO  gages  are  larger  than  NO  GO gages 2.  GO  gages  are  smaller  than  NO gages 3. GO and NO GO gages cannot be distinguished   from   each   other 4. GO gages and NO Go gages are always  the  same  size 2-30. Which   of   the   following   gage classes   indicates   that   the   gage   is precision   lapped   to   close tolerances? 1.   Class   Y 2.   Class   X 3.   Class   Z 4.   Class   ZZ 9