2-51. 2-52. 2-53. Which of the following types of drawings  takes  more  time  to  draw and is used where visual presentation is more important than time? 1. Single-line   orthographic 2. Double-line   orthographic 3. Single-line   isometric 4. Double-line   isometric What is the advantage of using single-line  isometric  drawings  to lay  out  piping  systems? 1. They take less time and show all  information  required 2. The  information  is  of  better graphic quality 3. They  take  less time   and are shown on three planes of projection 4. They are cheaper to produce and easier  to  understand A pipe connection is shown on a drawing  by  what  means? 1. A break in the line 2. A  qeneral  note  specifying  its location 3. A heavy dot and a note or specification to describe the type  of  connection 4. A leader line to the point of the connection and a note showing  how  the  connection should be made 2-54. Detachable connections may be shown on a pipe drawing by which of the following  means? 1. General  notes 2. Specifications 3. A bill of material 4. All of the above 2-55. On a pipe drawing, one pipe is shown  crossing  in  front  of  another by what means? 1. A heavy dot on the line represents  one  pipe  passing  in front of the other 2. The  line  representing  the  pipe farthest away has a break or interruption 3. The  line  representing  the closest pipe has a break or interruption 4. The  farthest  line  is  drawn  with a heavy, thick  line 2-59. 2-60 2-61 2-56. When an item is not covered by specific  standards,  what  person  or organization ensures that a suitable  symbol  is  used? 1. The  draftsman 2. The  technician 3. The designer of the fitting 4. The responsible activity 2-57. When standard fittings are not used on a drawing, fittings  such  as tees, elbows, and  crossings  are shown by which of the following means? 1. Notes  and  specifications 2. Continuous  lines 3. Circular  symbols  that  show  the direction  of  piping 4. Both 2 and 3 above 2-58. Piping  system  prints  with  more  than one of the same piping systems are shown on a drawing by what means? 1. Additional  letters  added  to  the symbols 2. A print with several drawing numbers 3. A general note or specification 4. Heavier  lines  that differentiate  between  the systems IN ANSWERING QUESTIONS 2-59 THROUGH 2-64, SELECT  FROM  THE  FOLLOWING  LIST  THE  COLOR ON THE PIPING SYSTEM THAT CARRIES THE MATERIAL  IN  THE  QUESTION. A. Yellow B. Brown C. Blue D. Green E. Gray F. Red Physically  dangerous  materials. 1. C 2. D 3. E 4. F Toxic  and  poisonous  materials. 1. A 2. B 3. C 4. D Fire  protection  materials. 1. C 2. D 3. E 4. F 12