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Oxy/Fuel
1. What gas provides the hottest flame when burned with oxygen?
a. Natural gasb. Propane
c. Acetylene d. MAPP
• Propane– 4,530 °F (2,500 °C)
• Natural Gas (methane)– 5,190 °F (2,865 °C)
• MAPP - methylacetylene-propadiene propane– 5,300 °F (2,925 °C)
• Acetylene/Oxygen– 5,700 - 6,330 °F (3,150 - 3,500 °C)
3. What is the maximum safe working pressure when using acetylene?
a. 15 lbsb. 10 lbs c. 20 lbs d. 30 lbs
5. Devices that prevent the gases from mixing in the hoses are called
a. back stoppersb. one way valves
c. reverse flow check valves d. gas valves
7. The vertical lines on the face of the cut are called
a. drag linesb. cutting lines c. sever lines d. heat lines
9. The flames used to bring the metal up to cut- ting temperature are called the
a. warming flames b. cutting flames c. preheat flames d. reducing flames
10. A condition that exists when the flame burns back in the torch is called a
a. burnback b. explosion c. reverse flow d. flashback
SMAW
11. For an E-7018 electrode the 70 stands for the
a. tensile strength times 10,000 lbs b. flux coating c. position the electrode can be used in d. core wire composition
12. The SMAW process uses what type of power supply?
a. constant potential b. constant voltage c. high voltaged. constant current
13. An E-11018 electrodea. is a low hydrogen electrodeb. has a tensile strength of 110,000
PSI c. can be used in all positionsd. is all of the above