iron worker final Questions and Verified Answers
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
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
concrete is strong in compression and______, but weak in______. Correct Answer: shear, tension
what are the small "U" or "W" shaped bars placed across a beam to resist diagonal tension known as?
Correct Answer: stirrups
Bar supports are also referred to as Correct Answer: accessories
the function of the______is to safely transmit the superstructure loads to the ground without causing
settlement. Correct Answer: foundation
in order to connect the column to its supports,______are required. Correct Answer: dowels
in erecting a wall where the footings have been previously doweled, it is necessary for all dowels to
be______and______. Correct Answer: straight, in-line
columns are made up of vertical bars and Correct Answer: bands or ties
what are the end supports for a beam bridge called? Correct Answer: abutments
SMAW uses which of the following electrode polarities? Correct Answer: all of the above
All arc-welding processes require a continuous supply of electrical current. What type of current can be
used for SMAW? Correct Answer: AC or DC
What type of power source yields a small welding current change when there is a large arc voltage
change? Correct Answer: constant current power source.
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
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
concrete is strong in compression and______, but weak in______. Correct Answer: shear, tension
what are the small "U" or "W" shaped bars placed across a beam to resist diagonal tension known as?
Correct Answer: stirrups
Bar supports are also referred to as Correct Answer: accessories
the function of the______is to safely transmit the superstructure loads to the ground without causing
settlement. Correct Answer: foundation
in order to connect the column to its supports,______are required. Correct Answer: dowels
in erecting a wall where the footings have been previously doweled, it is necessary for all dowels to
be______and______. Correct Answer: straight, in-line
columns are made up of vertical bars and Correct Answer: bands or ties
what are the end supports for a beam bridge called? Correct Answer: abutments
SMAW uses which of the following electrode polarities? Correct Answer: all of the above
All arc-welding processes require a continuous supply of electrical current. What type of current can be
used for SMAW? Correct Answer: AC or DC
What type of power source yields a small welding current change when there is a large arc voltage
change? Correct Answer: constant current power source.
