Procedure Questions and Answers
Question 1.
What is the importance of retaining safety instructions?
Correct Answer: To have them readily available for future reference.
Question 2.
What should be done if the high pressure gauge drops while the delivery gauge rises?
Correct Answer: There is a leak in the regulator seat; take the regulator to a
qualified repair technician.
Question 3.
What should you do upon completion of all cutting operations?
Correct Answer: Shut off the oxygen preheat valve and then close the torch fuel
valve.
Question 4.
What color is the oxygen hose typically in the U.S.?
Correct Answer: Green.
Question 5.
What type of thread do fuel gas inlet connections usually have?
Correct Answer: Left-hand threads.
Question 6.
What is 'cracking' the cylinder valve?
Correct Answer: Momentarily opening and closing the cylinder valve to dislodge
loose contaminants.
Question 7.
What should be done if the inlet gauge reading decreases during a leak test?
Correct Answer: There is a leak at the cylinder valve or inlet connection; tighten
the inlet connection after releasing pressure from the regulator.
Question 8.
What is the burning velocity of propane in oxygen?
Correct Answer: 12.2 ft/sec (3.7 m/sec)
Question 9.
What is a multi-flame heating nozzle also known as?
Correct Answer: Rosebud.
Question 10.
What should be done to minimize potential hazards when using oxy-fuel equipment?
Correct Answer: Understand proper safety and operating procedures.
Page 1
,Question 11.
What indicates that the cutting tip is too far from the plate?
Correct Answer: The top edge shows signs of being blown away.
Question 12.
What is the design of the cutting attachment head intended for?
Correct Answer: To keep cutting oxygen and mixed preheat gas separated
during cutting operations.
Question 13.
What is the burning velocity of natural gas in oxygen?
Correct Answer: 15.2 ft/sec (4.6 m/sec)
Question 14.
Who should perform service or repair on the apparatus?
Correct Answer: A qualified repair technician only.
Question 15.
What should be done to cylinder valves?
Correct Answer: Inspect for damaged parts and keep them clean and free from
oil, grease, and foreign materials.
Question 16.
What is the purpose of purging the oxygen and fuel hoses?
Correct Answer: To remove any residual gas after every shut-down.
Question 17.
What must be present on the cone end of the welding nozzle?
Correct Answer: There must always be two O-rings. The absence or damage of
either allows premixing of gases, leading to a sustained backfire.
Question 18.
What is the maximum allowable use pressure for propylene cylinders?
Correct Answer: 135 PSIG @ 70°F (930 kPa @ 21°C)
Question 19.
What is the primary flame BTU value for acetylene?
Correct Answer: 507 BTU/ft³ (18.9 MJ/m³)
Question 20.
What is the main application for oxygen?
Correct Answer: Oxygen is primarily used in melting, refining, and
manufacturing of steel and other metals.
Question 21.
What are the basic external features of a regulator?
Page 2
,Correct Answer: CGA inlet connection, pressure adjusting screw, inlet gauge,
delivery gauge, outlet connection, and relief valve.
Question 22.
What is a characteristic sound of cutting with high oxygen flow?
Correct Answer: The sound of the cut is exceptionally loud.
Question 23.
What are the main components of a torch handle?
Correct Answer: Gas tubes with control valves for fuel and oxygen supply, and a
mixing apparatus.
Question 24.
What should be done with gas cylinders during storage?
Correct Answer: Keep them away from heat sources and protect them from
bumps and falling objects.
Question 25.
What should you inspect before using gas cylinders?
Correct Answer: Inspect the cylinder valves for damaged parts and keep them
clean, free from oil, grease, and foreign materials.
Question 26.
What should be done to prevent warping of metals during welding?
Correct Answer: Tack the ends of the two pieces of metal together before
welding.
Question 27.
What should be done with hoses that contain multiple splices?
Correct Answer: Completely replace the gas hose.
Question 28.
What should you do if you cannot make a gas-tight seal between the cylinder valve and a
regulator nipple?
Correct Answer: Check if the connection nut is tight and inspect the regulator
inlet connection for damage.
Question 29.
What is the purpose of tack welding?
Correct Answer: To hold the pieces of metal together before the final weld is
made.
Question 30.
What should you do with hoses before attaching the torch handle or regulators?
Correct Answer: Examine the hoses for cuts, burns, worn areas, cracks, or
damaged fittings; repair or replace if found.
Page 3
, Question 31.
What is a sustained backfire?
Correct Answer: The return of the flame into the torch with continued burning
within the torch, often accompanied by a hissing sound.
Question 32.
What should you do if the preheat and cutting oxygen holes are clogged?-
Correct Answer: Clean them out with the proper size tip cleaner.
Question 33.
What should be done before opening the acetylene cylinder valve?
Correct Answer: Keep the cylinder wrench on the valve for quick shut-off if
necessary.
Question 34.
What should you do if the packing of an acetylene cylinder valve is leaking?-
Correct Answer: Do not use the cylinder and consult your gas supplier for the
proper method of adjusting the packing.
Question 35.
What type of floor is required in the work area?
Correct Answer: A fireproof floor.
Question 36.
What should you wear for eye protection while welding?
Correct Answer: Protective goggles with shaded 5 or darker tempered lenses.
Question 37.
What type of thread do oxygen connections have?
Correct Answer: Right-hand threads.
Question 38.
What should be done before starting a brazing operation?
Correct Answer: Clean away paint, rust, grease, and dirt from the parts to be
brazed.
Question 39.
What should you do if the preheat flames are not the same size?
Correct Answer: Turn off the torch and let it cool, then clean the tip.
Question 40.
What type of clothing should be avoided during welding operations?
Correct Answer: Clothing that is easily ignited, such as polyester pants or shirts.
Question 41.
How should you stand when opening the cylinder valve?
Page 4
Question 1.
What is the importance of retaining safety instructions?
Correct Answer: To have them readily available for future reference.
Question 2.
What should be done if the high pressure gauge drops while the delivery gauge rises?
Correct Answer: There is a leak in the regulator seat; take the regulator to a
qualified repair technician.
Question 3.
What should you do upon completion of all cutting operations?
Correct Answer: Shut off the oxygen preheat valve and then close the torch fuel
valve.
Question 4.
What color is the oxygen hose typically in the U.S.?
Correct Answer: Green.
Question 5.
What type of thread do fuel gas inlet connections usually have?
Correct Answer: Left-hand threads.
Question 6.
What is 'cracking' the cylinder valve?
Correct Answer: Momentarily opening and closing the cylinder valve to dislodge
loose contaminants.
Question 7.
What should be done if the inlet gauge reading decreases during a leak test?
Correct Answer: There is a leak at the cylinder valve or inlet connection; tighten
the inlet connection after releasing pressure from the regulator.
Question 8.
What is the burning velocity of propane in oxygen?
Correct Answer: 12.2 ft/sec (3.7 m/sec)
Question 9.
What is a multi-flame heating nozzle also known as?
Correct Answer: Rosebud.
Question 10.
What should be done to minimize potential hazards when using oxy-fuel equipment?
Correct Answer: Understand proper safety and operating procedures.
Page 1
,Question 11.
What indicates that the cutting tip is too far from the plate?
Correct Answer: The top edge shows signs of being blown away.
Question 12.
What is the design of the cutting attachment head intended for?
Correct Answer: To keep cutting oxygen and mixed preheat gas separated
during cutting operations.
Question 13.
What is the burning velocity of natural gas in oxygen?
Correct Answer: 15.2 ft/sec (4.6 m/sec)
Question 14.
Who should perform service or repair on the apparatus?
Correct Answer: A qualified repair technician only.
Question 15.
What should be done to cylinder valves?
Correct Answer: Inspect for damaged parts and keep them clean and free from
oil, grease, and foreign materials.
Question 16.
What is the purpose of purging the oxygen and fuel hoses?
Correct Answer: To remove any residual gas after every shut-down.
Question 17.
What must be present on the cone end of the welding nozzle?
Correct Answer: There must always be two O-rings. The absence or damage of
either allows premixing of gases, leading to a sustained backfire.
Question 18.
What is the maximum allowable use pressure for propylene cylinders?
Correct Answer: 135 PSIG @ 70°F (930 kPa @ 21°C)
Question 19.
What is the primary flame BTU value for acetylene?
Correct Answer: 507 BTU/ft³ (18.9 MJ/m³)
Question 20.
What is the main application for oxygen?
Correct Answer: Oxygen is primarily used in melting, refining, and
manufacturing of steel and other metals.
Question 21.
What are the basic external features of a regulator?
Page 2
,Correct Answer: CGA inlet connection, pressure adjusting screw, inlet gauge,
delivery gauge, outlet connection, and relief valve.
Question 22.
What is a characteristic sound of cutting with high oxygen flow?
Correct Answer: The sound of the cut is exceptionally loud.
Question 23.
What are the main components of a torch handle?
Correct Answer: Gas tubes with control valves for fuel and oxygen supply, and a
mixing apparatus.
Question 24.
What should be done with gas cylinders during storage?
Correct Answer: Keep them away from heat sources and protect them from
bumps and falling objects.
Question 25.
What should you inspect before using gas cylinders?
Correct Answer: Inspect the cylinder valves for damaged parts and keep them
clean, free from oil, grease, and foreign materials.
Question 26.
What should be done to prevent warping of metals during welding?
Correct Answer: Tack the ends of the two pieces of metal together before
welding.
Question 27.
What should be done with hoses that contain multiple splices?
Correct Answer: Completely replace the gas hose.
Question 28.
What should you do if you cannot make a gas-tight seal between the cylinder valve and a
regulator nipple?
Correct Answer: Check if the connection nut is tight and inspect the regulator
inlet connection for damage.
Question 29.
What is the purpose of tack welding?
Correct Answer: To hold the pieces of metal together before the final weld is
made.
Question 30.
What should you do with hoses before attaching the torch handle or regulators?
Correct Answer: Examine the hoses for cuts, burns, worn areas, cracks, or
damaged fittings; repair or replace if found.
Page 3
, Question 31.
What is a sustained backfire?
Correct Answer: The return of the flame into the torch with continued burning
within the torch, often accompanied by a hissing sound.
Question 32.
What should you do if the preheat and cutting oxygen holes are clogged?-
Correct Answer: Clean them out with the proper size tip cleaner.
Question 33.
What should be done before opening the acetylene cylinder valve?
Correct Answer: Keep the cylinder wrench on the valve for quick shut-off if
necessary.
Question 34.
What should you do if the packing of an acetylene cylinder valve is leaking?-
Correct Answer: Do not use the cylinder and consult your gas supplier for the
proper method of adjusting the packing.
Question 35.
What type of floor is required in the work area?
Correct Answer: A fireproof floor.
Question 36.
What should you wear for eye protection while welding?
Correct Answer: Protective goggles with shaded 5 or darker tempered lenses.
Question 37.
What type of thread do oxygen connections have?
Correct Answer: Right-hand threads.
Question 38.
What should be done before starting a brazing operation?
Correct Answer: Clean away paint, rust, grease, and dirt from the parts to be
brazed.
Question 39.
What should you do if the preheat flames are not the same size?
Correct Answer: Turn off the torch and let it cool, then clean the tip.
Question 40.
What type of clothing should be avoided during welding operations?
Correct Answer: Clothing that is easily ignited, such as polyester pants or shirts.
Question 41.
How should you stand when opening the cylinder valve?
Page 4
