Oxyfuel Pre-Test

Oxyfuel

STUDY GUIDE

Copyright  2004 Lincoln Global, Inc. 1 E- Date: 03/17/12 Oxyfuel Study Guide

1. The oxyfuel process uses oxygen and what other types of gases? a. Inert Gases b. Active Gases c. Fuel Gases d. None of the Above

2. What polarity does oxyfuel welding employ? a. AC b. DC+ c. DC- d. None of the Above

3. What is the most common gas used for oxyfuel welding? a. Acetylene b. Propane c. Natural Gas d. Propylene

4. Which material cannot be cut by the oxyfuel process? a. Carbon Steel b. Stainless Steel c. Low-alloy Steel d. None of the Above

5. What is the recommended lens shade for most oxyfuel welding applications? a. 3 b. 5 c. 7 d. 9

6. In the AWS classification, R45, what does the "45" stand for? a. Melting Temperature in 0C b. % Silver in Solder c. Minimum Tensile Strength d. None of the Above

7. Check valves are optional pieces of equipment? a. True b. False

8. What type of thread and color are fuel gases associated with? a. Right Hand Thread - Red b. Left Hand Thread - Red c. Right Hand Thread - Green d. Left Hand Thread - Green

9. Which type of hose is used for alternate fuel gases? a. “R” Grade b. “A” Grade c. “O” Grade d. “T” Grade

10. When oxyfuel cutting, gases are mixed in the following before exiting the torch? a. Head b. Tube c. Tip d. All of the Above

Copyright  2004 Lincoln Global, Inc. 2 E- Date: 03/17/12 11. When oxyfuel (oxygen/acetylene) welding, a good ratio (oxygen:acetylene) setting would be? a. 1:1 b. 2:1 c. 1:2 d. 0.5:1

12. When lighting an oxyfuel torch, which is the best sequence? a. Purge, Turn on Oxygen, Turn on Fuel, Ignite b. Purge, Turn on Fuel, Ignite, Turn on Oxygen c. Purge, Turn on Fuel, Turn on Oxygen, Ignite d. Turn on Fuel, Ignite, Turn on Oxygen

13. What is the maximum draw rate per hour of a tank of Acetylene? a. 1/3rd b. 1/5th c. 1/7th d. 1/9th

14. The following gas cylinder should be fully opened during normal use? a. Oxygen b. Acetylene c. Propane d. MAPP

15. To what temperature must steel be raised in order to properly cut it? a. Melting b. Kindling c. Transition d. Transformation

16. There are 2 types of cutting torches. One is an equal pressure torch. What is the other? a. Injector b. Positive Pressure c. Venturri d. High Pressure

17. When setting up oxyfuel equipment, the green hose attaches to what? a. Oxygen Fitting b. Fuel Gas Fitting

18. Fuel gas & oxygen regulators can be used interchangeably? a. True b. False

19. What type of CGA fitting does Oxygen have? a. 300 b. 510 c. 540 d. 580

20. All of these are characteristics of acetylene except? a. Shock Sensitive b. Flammable c. Unstable d. None of the Above

Copyright  2004 Lincoln Global, Inc. 3 E- Date: 03/17/12

21. All of these can cause flashbacks except? a. Dirty Welding/Cutting Tip b. Improper Welding/Cutting Procedure c. Dirty Check Valves d. None of the Above

22. As a tank depletes with a single stage regulator, what occurs? a. Outlet Pressure Rises b. Outlet Pressure Drops c. Output Remains Constant d. None of the Above

23. The temperature of a neutral oxy-acetylene flame is approximately? a. 4,500 oF b. 5,500 oF c. 6,500 oF d. 10,000 oF

24. Oxyfuel cutting is this type of chemical process? a. Sublimation b. Reduction c. Addition d. Oxidation

25. What is the recommended lens shade for most oxyfuel cutting applications? a. 3 b. 5 c. 7 d. 9

26. In the AWS classification, R65, what does the "65" stand for? a. 6,500 oF Melting Temperature b. 65% Silver in Solder c. 65,000 psi Minimum Tensile Strength d. None of the Above

27. Aluminum can be welded with the oxyfuel process? a. True b. False

28. What type of thread and color is oxygen associated with? a. Right Hand Thread - Red b. Left Hand Thread - Red c. Right Hand Thread - Green d. Left Hand Thread - Green

29. Which type of hose is used for acetylene fuel gases? a. “R” Grade b. “A” Grade c. “O” Grade d. “T” Grade

30. When oxyfuel welding, gases are mixed in the following before exiting the torch? a. Head b. Tube c. Tip d. Mixer

Copyright  2004 Lincoln Global, Inc. 4 E- Date: 03/17/12 31. Which gas is better for heating applications? a. Natural Gas b. Propane c. MAPP d. Acetylene

32. Acetylene is dissolved into this substance? a. Acetone b. Ethanol c. Butanol d. Ketone

33. What is the maximum draw rate per hour of a tank of propane gas? a. 1/3rd b. 1/5th c. 1/7th d. None of the Above

34. Of the alternate fuels, which if any can also be used for welding? a. Propylene b. MAPP c. Propane d. Natural Gas

35. What is not a type of welding flame? a. Neutral b. Carburizing c. Oxidizing d. Reducing

36. There are 2 types of cutting torches. One is an injector torch. What is the other? a. Low Pressure b. Venturri Pressure c. Positive Pressure d. Different Pressure

37. Alternate fuel cylinders should be fully opened during normal use? a. True b. False

38. Acetylene cylinders are constructed the same as alternate fuel cylinders? a. True b. False

39. What type of CGA fitting does propane have? a. 300 b. 510 c. 540 d. 580

40. These charts/graphs are used to properly size regulators? a. Time Charts b. Pressure Charts c. Flow Charts d. Density Charts