1. Which type of threads is recommended for plumbing hydraulic circuits?

  1. SAE straight threads
  2. NPT tapered pipe threads
  3. BSP tapered pipe threads

2. What is the minimum size pipe to handle 400-cfm air flow for 500 feet?

  1. 4 in.
  2. 5 in.
  3. 6 in.

3. What is the recommended fluid velocity for a suction line?

  1. 2 to 4 fps
  2. 10 to 15 fps
  3. 30 fps

4. A grid system for plant air piping requires:

  1. several small compressors
  2. several large compressors
  3. one adequately sized compressor

5. For hydraulic lines up to and including 2 in., use:

  1. steel tubing
  2. black-iron pipe
  3. plastic pipe

6. Always take drop lines in an air piping circuit from the:

  1. bottom of the header
  2. side of the header
  3. top of the header

7. Elbows are better than smooth tubing bends.

  1. True
  2. False

8. The pipes in an air plumbing system should be:

  1. sloped away from the receiver tank
  2. sloped toward the receiver tank
  3. level

9. Hose size is designated by its:

  1. ID
  2. OD
  3. ND

10. Velocity in hydraulic circuit return lines should be:

  1. 2 to 4 fps.
  2. 10 to 15 fps.
  3. 15 to 20 fps.