WELDING OXYFUEL CUTTING TORCH WRITTEN TEST
REVIEW QUESTIONS
What do regulators do (what do they tell)? - Answers -Indicate tank pressure and work
pressure.
what color is the oxygen hose? - Answers -Green (high pressure hose)
What color is the fuel gas hose? - Answers -Red (low pressure hose)
What kind of flame do you get when there is more fuel than oxygen and 3 distinct parts
of the flame are present? - Answers -Carbonizing flame
What kind of flame do you get when 2 separate parts of the flame are present? The
inner flame is brought as bright blue with rounded cones. - Answers -Neutral flame
What kind of flame do you get when 2 distinct parts of the flame are similar to that of the
neutral flame, but the inner flame is pointed and makes a hissing noise? - Answers -
Oxidizing flame
When does reverse flow occur? - Answers -When a gas goes into the other gas side of
torch or vise versa.
What causes reverse flow to occur? - Answers -Blockage in the tip or the torch, and low
or no pressure in 1 of the tanks.
When does flash back occur? - Answers -When a flame continues to burn back into the
torch, mixing chamber, torch valves, hoses, and possible into the regulators.
When does back fire occur? - Answers -When the return of a flame goes back into the
torch creating a small explosions and popping noises.
What causes a back fire to occur? - Answers -Incorrect gas pressure, incorrect tip size,
overheated tip, and carbon depositing inside of the tip.
What is the flame temperature of an acetylene flame? - Answers -5,600 degrees
What is the temperature of an propylene flame? - Answers -5,300 degrees
What is the flame temperature of an MAPP flame? - Answers -5,300 degrees
What does MAPP stand for? - Answers -Methyl- acetylene propadiene
What is the flame temperature of a propane flame? - Answers -4,600 degrees
REVIEW QUESTIONS
What do regulators do (what do they tell)? - Answers -Indicate tank pressure and work
pressure.
what color is the oxygen hose? - Answers -Green (high pressure hose)
What color is the fuel gas hose? - Answers -Red (low pressure hose)
What kind of flame do you get when there is more fuel than oxygen and 3 distinct parts
of the flame are present? - Answers -Carbonizing flame
What kind of flame do you get when 2 separate parts of the flame are present? The
inner flame is brought as bright blue with rounded cones. - Answers -Neutral flame
What kind of flame do you get when 2 distinct parts of the flame are similar to that of the
neutral flame, but the inner flame is pointed and makes a hissing noise? - Answers -
Oxidizing flame
When does reverse flow occur? - Answers -When a gas goes into the other gas side of
torch or vise versa.
What causes reverse flow to occur? - Answers -Blockage in the tip or the torch, and low
or no pressure in 1 of the tanks.
When does flash back occur? - Answers -When a flame continues to burn back into the
torch, mixing chamber, torch valves, hoses, and possible into the regulators.
When does back fire occur? - Answers -When the return of a flame goes back into the
torch creating a small explosions and popping noises.
What causes a back fire to occur? - Answers -Incorrect gas pressure, incorrect tip size,
overheated tip, and carbon depositing inside of the tip.
What is the flame temperature of an acetylene flame? - Answers -5,600 degrees
What is the temperature of an propylene flame? - Answers -5,300 degrees
What is the flame temperature of an MAPP flame? - Answers -5,300 degrees
What does MAPP stand for? - Answers -Methyl- acetylene propadiene
What is the flame temperature of a propane flame? - Answers -4,600 degrees
