Ironworker NCCER
Iron Worker Final Exam Questions and
Answers Graded A+ 2025-2026
the kindling temperature of steel is -Correct Answer ✔1600 degrees
one advantage of the OFC process is that it is -Correct Answer ✔portable
the materials that can be cut with OFC are limited primarily to _______materials -
Correct Answer ✔ferrous
A welder opens the cylinder valve slightly and closes it immediately. what process did
he/she perform? -Correct Answer ✔cracking the cylinder
A device that prevents the reverse flow of gasses that would result in a combustible
mixture in the welding hose is a -Correct Answer ✔check valve
A condition in which the flame burns inside the tip, torch or hose is known as a -Correct
Answer ✔flashback
acetylene cylinder valves should be opened only approximately one to one-and-a-half
turns to -Correct Answer ✔provide quick closure in case of an emergency
most oxygen and fuel gas regulators have gauges that measure actual pressure in the
cylinder and -Correct Answer ✔pressure at the torch
while oxygen cylinder pressure may be as high as 2200 psi, working pressure ranges
from_______to______psi. -Correct Answer ✔1, 50
Ironworker NCCER
, Ironworker NCCER
which is the best flame for welding and cutting? -Correct Answer ✔Neutral
Which of the following conditions will cause carburizing or reducing flame? -Correct
Answer ✔excess acetylene
If an operator using an OFC process produced an irregular cut surface with pitting and
undercutting, the most likely cause is -Correct Answer ✔a dirty cutting tip
which of the following is basic definition of concrete? -Correct Answer ✔artificially made
rock
what is the term for the weight of all moving and constantly acting loads? -Correct
Answer ✔live load
which of the following is not one of the three basic components of concrete? -Correct
Answer ✔lime
which of the following is the most accurate range of strengths for concrete? -Correct
Answer ✔3000 to 20,000 psi
when reinforcing concrete, what does the steel add to the concrete? -Correct Answer
✔tensile strength
what size wire is used to tie most rebar? -Correct Answer ✔16
which of the following is a low foundation wall of sufficient depth to extend below the
frost line? -Correct Answer ✔grade beam
Ironworker NCCER
Iron Worker Final Exam Questions and
Answers Graded A+ 2025-2026
the kindling temperature of steel is -Correct Answer ✔1600 degrees
one advantage of the OFC process is that it is -Correct Answer ✔portable
the materials that can be cut with OFC are limited primarily to _______materials -
Correct Answer ✔ferrous
A welder opens the cylinder valve slightly and closes it immediately. what process did
he/she perform? -Correct Answer ✔cracking the cylinder
A device that prevents the reverse flow of gasses that would result in a combustible
mixture in the welding hose is a -Correct Answer ✔check valve
A condition in which the flame burns inside the tip, torch or hose is known as a -Correct
Answer ✔flashback
acetylene cylinder valves should be opened only approximately one to one-and-a-half
turns to -Correct Answer ✔provide quick closure in case of an emergency
most oxygen and fuel gas regulators have gauges that measure actual pressure in the
cylinder and -Correct Answer ✔pressure at the torch
while oxygen cylinder pressure may be as high as 2200 psi, working pressure ranges
from_______to______psi. -Correct Answer ✔1, 50
Ironworker NCCER
, Ironworker NCCER
which is the best flame for welding and cutting? -Correct Answer ✔Neutral
Which of the following conditions will cause carburizing or reducing flame? -Correct
Answer ✔excess acetylene
If an operator using an OFC process produced an irregular cut surface with pitting and
undercutting, the most likely cause is -Correct Answer ✔a dirty cutting tip
which of the following is basic definition of concrete? -Correct Answer ✔artificially made
rock
what is the term for the weight of all moving and constantly acting loads? -Correct
Answer ✔live load
which of the following is not one of the three basic components of concrete? -Correct
Answer ✔lime
which of the following is the most accurate range of strengths for concrete? -Correct
Answer ✔3000 to 20,000 psi
when reinforcing concrete, what does the steel add to the concrete? -Correct Answer
✔tensile strength
what size wire is used to tie most rebar? -Correct Answer ✔16
which of the following is a low foundation wall of sufficient depth to extend below the
frost line? -Correct Answer ✔grade beam
Ironworker NCCER
