Answer Key: Self-Test C-1.20

  1. What is the name of the chemical grouping of petroleum gases?
    1. hydrocarbons
  2. Name the three most commonly used fuel gases.
    1. natural gas
    2. propane
    3. butane
  3. What are the main components of natural gas?
    1. methane
    2. ethane
  4. What are the names given to the ratio of the weight of a given volume of a gas compared to the weight of the same volume of air?
    1. specific gravity
    2. relative density
  5. What is the relative density of each of the following gases?
    1. natural gas
      1. 0.6
    2. propane gas
      1. 1.5
    3. butane gas
      1. 2.0
    4. air
      1. 1.0
  6. What is the ignition temperature (°F) of each of the following gases?
    1. natural gas
      1. 1,100-1,200 °F
    2. propane gas
      1. 920-1,020 °F
    3. butane gas
      1. 900-1,000 °F
  7. What are the six major factors that affect the flow of gas in a piping system?
    1. type of gas
    2. type of pipe
    3. length of pipe
    4. diameter of pipe
    5. number of fittings
    6. pressure drop
  8. What is the specific gravity of each of the following LP liquids?
    1. propane
      1. 0.51
    2. butane
      1. 0.58
  9. What is the calorific value of each of the following fuel gases in [latex]\frac{\text{BTU}}{\text{ft.}^3}[/latex]?
    1. natural gas
      1. [latex]1,000\frac{\text{BTU}}{\text{ft.}^3}[/latex]
    2. propane gas
      1. [latex]2,500\frac{\text{BTU}}{\text{ft.}^3}[/latex]
    3. butane gas
      1. [latex]3,200\frac{\text{BTU}}{\text{ft.}^3}[/latex]
  10. What is the calorific value of each of the following fuel gases in [latex]\frac{\text{kW}}{\text{m}^3}[/latex]?
    1. natural gas
      1. [latex]10.35\frac{\text{kW}}{\text{m}^3}[/latex]
    2. propane gas
      1. [latex]25.86\frac{\text{kW}}{\text{m}^3}[/latex]
    3. butane gas
      1. [latex]33.1\frac{\text{kW}}{\text{m}^3}[/latex]
  11. What is the calorific value of each of the following fuel gases in [latex]\frac{\text{kW}}{\text{ft.}^3}[/latex]?
    1. natural gas
      1. [latex]0.293\frac{\text{kW}}{\text{ft.}^3}[/latex]
    2. propane gas
      1. [latex]0.732\frac{\text{kW}}{\text{ft.}^3}[/latex]
    3. butane gas
      1. [latex]0.937\frac{\text{kW}}{\text{ft.}^3}[/latex]
  12. What is the calorific value of the following fuel gases in [latex]\frac{\text{BTU}}{\text{m}^3}[/latex]?
    1. natural gas
      1. [latex]35,310\frac{\text{BTU}}{\text{m}^3}[/latex]
    2. propane gas
      1. [latex]88,275\frac{\text{BTU}}{\text{m}^3}[/latex]
    3. butane gas
      1. [latex]112,992\frac{\text{BTU}}{\text{m}^3}[/latex]
  13. What is added to fuel gases to make leaks more noticeable?
    1. mercaptan

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