2-23. Instead of using a T-square, some drafters  prefer  a  parallel straightedge because it offers which of  the  following  advantages? 1. It allows the drafter to produce cleaner  drawings 2. It helps prevent ink blots on small  drawings 3. It allows the drafter to work more  accurately  on  large  drawings 4. It  helps  keep  drawings  from sliding  off  an  inclined  drawing board 2-24. What is the most desirable source of illumination  for  drafting  work? 1. Direct  sunlight 2. Adjustable fluorescent table lamps 3. Overhead  ceiling  lights 4. Natural  light 2-25. Assuming that a drafter is right-handed,    the  lighting  should  be from what direction? 1. Left-front 2. Right-front 3. Over the right shoulder 4. Over the left shoulder Figure    2A IN  ANSWERING  QUESTIONS  2-26  AND  2-27,  REFER TO TRIANGLES X AND Y IN FIGURE 2A. 2-26. The size of a 30°-60° triangle (X) is designated  by  the 1. length of AB 2. length of BC 3. size of angle A or C 4. perimeter of the triangle 2-27. The size of a 45° triangle (Y) is designated  by  the 1. length of DE 2. length of DF or EF, whichever you prefer 3. perimeter of the triangle 4. size of angle D or E 2-28. Assume that you are testing the straightness of a 45° triangle. The first step you should take is to place the triangle against a T- square and draw a vertical line. The next step is to take what actions? 1. 2. 3. 4. Rotate the triangle and draw another vertical line, which should  coincide  with  the  first line Slide the triangle to the left (or right) and draw an intersecting  45°  line,  which  can be tested for accuracy with a protractor Reverse the triangle and draw another  vertical  line  along  the same  edge. This  line  should coincide  with  the  first Reverse the T-sauare and draw another  vertical  line  along  the same  edge. This line should coincide  with  the  first 2-29. In which of the following ways are circular  protractors  graduated? 1. Clockwise from 0° to 90° and 180° to 270°, and counterclockwise  from  360°  to 270° and 180° to 90° 2. Clockwise  and  counterclockwise from 0° to 180° 3. Clockwise  and  counterclockwise from 0° to 360° 4. Clockwise  in  quadrants  from  0° to 90° 2-30. Without estimating, what is the minimum angle that can be set on the adjustable triangle shown in textbook  figure  2-13? 1. 30 seconds 2. 15 seconds 3. 30 minutes 4. 1 degree 2-31. For which of the following shapes should  you  NOT  use  french  curves? 1. Spirals 2. Ellipses 3. Parabolas 4. Circular  arcs 11