Self-Test D-2.3 Creating Plans and Isometric Drawings of DWV Systems

Complete Self-Test D-2.3 and check your answers.

Figure 1

Using Figure 1, identify each type of line in Questions 1–7 by stating its:

  1. Name (e.g., body line, hidden line, centreline, etc.)
  2. Main use (e.g., shows object outline, shows centre of an object, shows the end of a dimension, etc.)
  1. Line 1
  2. Line 2
  3. Line 3
  4. Line 4
  5. Line 5
  6. Line 6
  7. Line 7
  1. What is the purpose of a cutting plane line used in technical drawings?
    1. Indicates the centre of an object
    2. Shows alternate positions of a part
    3. Shows hidden object lines not visible to the eye
    4. Indicates where an imaginary cutting plane takes place

     

  2. Which of the following lines should be drawn the thinnest?
    1. Body line
    2. Cutting plane line
    3. Hidden body line
    4. Leader line

     

  3. What type of DWV plumbing drawing shows only horizontal two-dimensional details of the plumbing system on a single floor?
    1. DWV isometric drawing
    2. Plumbing detail drawing
    3. Plumbing rough-in drawing
    4. Orthographic plumbing plan

     

  4. Most horizontal pipelines are drawn in what way on isometric drawings?
    1. Vertically
    2. 300° to the vertical
    3. 300° to the horizontal
    4. 450° to the horizontal

     

  5. Why is it preferable to align the bottom floor stacks directly under the upper floor stack and/or stack vent?
    1. It is a plumbing code requirement
    2. Makes it easier to clean out the system
    3. Eliminates the need for an offset between floors
    4. Reduces the hydraulic fixture unit load on the stack vent

     

  6. When sketching an isometric plumbing layout, which plumbing fittings are not shown to scale?
    1. 45° ells
    2. P-traps
    3. Wye fitting branches
    4. All of the above

     

  7. When preparing an orthographic drawing sheet, what would be the best scale to use when the project is 83 ft 4 in. long and the available drafting sheet is 10 in. long?
    1. 1:10
    2. 1:100
    3. 1:1000
    4. 0.25 in. per foot

     

Answer Key: Self-Test D-2.3 is on the next page.

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