Self-Test B-5.1: Describe Oxy-Acetylene Equipment

Complete Self-Test B-5.1 and check your answers.

1.                         is not a fuel gas.
   1. Natural gas
   2. MAPP gas
   3. Oxygen gas
   4. Acetylene gas

2. Which gas has the highest flame temperature?
   1. Acetylene gas
   2. Propane gas
   3. MAPP gas
   4. Natural gas

3. What is the first step in putting out a fire in the hoses of an oxyacetylene outfit?
   1. Use a fire extinguisher on the hoses.
   2. Close only the acetylene cylinder valve.
   3. Close only the oxygen cylinder valve.
   4. Close both the oxygen and acetylene cylinder valves.

4. The critical point of free acetylene is                       psi (                       kPa) pressure at 21°C (70°F); if the temperature is increased, the pressure becomes critical at a                       pressure.
5. The safety devices on an acetylene cylinder are                        activated.
6. Oxygen cylinder valves are opened                        , acetylene cylinder valves are opened                        .
7. Liquid fuel cylinders are designed to allow the liquid to                       when the cylinder valve is opened and gas escapes.
8. When cylinders are too low on gas to be used, they should be marked                        .
9. Cylinder valves should always be                        open momentarily before the regulator is attached, and                       when your work is finished.
10. To increase the working pressure, the pressure-adjusting screw is turned                        .
11. A grooved hex nut indicates a(n)                       regulator.
12. The gauge with the higher numerical calibrations indicates                    pressure.
13. The gauge with the lower numerical calibrations indicates                       pressure.
14. The colour of an oxygen hose is usually                        .
15. The colour of the fuel gas hose is usually                        .
16. An RFCV placed between the torch and hose has the arrow pointing toward the                        ; between the hose and regulator, it is pointing toward the                      .
17. When you are using the combination torch for the cutting process, the                       valve is used to adjust the amount of oxygen mixed with acetylene for preheating.
18. If a flashback occurs, the                       and                       valves must be shut down as soon as possible.

Answer Key: Self-Test B-5.1 is on the next page.