Millwright - 2nd Year - Oxy-Fuel Equipment
and Procedures: Part B Exam Questions and
Answers with Verified Solutions | Latest
Updated 2026
What is a general rule before To open and close the torch needle valves
lighting on at a
the torch for welding or cutting? time to purge the lines of any explosive air
mixture
that may exist in the line
What should always be used to A proper spark igniter (striker)
light
a torch?
How much should you open the 1/2 Turn
acetylene needle valve when
lighting a torch?
Should you light a torch with a No. It should be lit with acetylene only
mixture of acetylene and oxygen?
What should you do when welding Close the cylinder valves and bleed the
or cutting is to be stopped for a gas
considerable amount of time? pressure from both regulators
, When shutting a torch down, Oxygen
which
cylinder valve is shut off first?
During shutdown, what should be Open the needle valve and bleed the line
done after closing each cylinder
valve?
To prevent the seat from Turn in the working pressure adjusting
corroding, screw just
what should be done when enough to release the spring pressure on
regulators are to be out of service the valve
for weeks or longer? seat
What is backfire? When the flame backs up into the tip and
mixer,
usually resulting in a pop
What is often the cause of Unequal pressures and too little gas flow
backfire?
What is flashback? When one gases backs up into the line of
the other,
creating an explosive mixture and resulting
in an
explosion, or series of explosions.
and Procedures: Part B Exam Questions and
Answers with Verified Solutions | Latest
Updated 2026
What is a general rule before To open and close the torch needle valves
lighting on at a
the torch for welding or cutting? time to purge the lines of any explosive air
mixture
that may exist in the line
What should always be used to A proper spark igniter (striker)
light
a torch?
How much should you open the 1/2 Turn
acetylene needle valve when
lighting a torch?
Should you light a torch with a No. It should be lit with acetylene only
mixture of acetylene and oxygen?
What should you do when welding Close the cylinder valves and bleed the
or cutting is to be stopped for a gas
considerable amount of time? pressure from both regulators
, When shutting a torch down, Oxygen
which
cylinder valve is shut off first?
During shutdown, what should be Open the needle valve and bleed the line
done after closing each cylinder
valve?
To prevent the seat from Turn in the working pressure adjusting
corroding, screw just
what should be done when enough to release the spring pressure on
regulators are to be out of service the valve
for weeks or longer? seat
What is backfire? When the flame backs up into the tip and
mixer,
usually resulting in a pop
What is often the cause of Unequal pressures and too little gas flow
backfire?
What is flashback? When one gases backs up into the line of
the other,
creating an explosive mixture and resulting
in an
explosion, or series of explosions.
