Pipefitter license test 2023 Questions and Answers with
complete solution
When OXY fuel cutting boots should be at least
8" tall
Are the most effective hearing protection
Disposable ear plugs
Reduces risk of flash burn
Safety glasses with properly tinted lenses
Combining pure oxygen with a burning material causes a fire to
Burn and flare out of control
In hollow steel cylinders oxygen is stored at more than
2,000 pounds per square inch (psi)
Largest oxygen cylinder holds about
485 cubic feet of oxygen
Most common size oxygen cylinder for welding/cutting is
227 cubic square feet of oxygen
Cylinders are stamped with gas name on
Shoulder of cylinder
When acetylene is mixed with oxygen the acetylene caused flame to burn hotter
than
5500°
Wait at least_______ before usuing a tipped over acetylene bottle
30 min
Safety plugs on top and bottom of cylinders melt at
220°
Methylacetylene propadiene (MAPP) gas is a combination of acetylene and
Propane or propylene-raw form of propane
When oxy fuel cutting propylene mixtures burn at about
5193°
If a high volume of gas is removed from a liquefied cylinder the pressure
Drops and the temperature of the cylinder drops also
Oxygen cylinders always have
Right handed threads on all connections
As a reminder that the regulator on a cylinder has left handed threads, a V-notch
is sometimes cut around the
Nut
Oxygen hoses are usually
Green or black
Acetylene hoses are always
Red
On a combination cutting torch, the primary fuel gas and oxygen valves are
located on
Torch handle
, The selection of a cutting torch tip depends on the thickness of the base metal
being cut and the
Kind of fuel gas being used
The special cutting tip for cutting off bolt heads and nuts is called a
Rivet cutting tip
A oxyfuel cutting torch should be checked for leaks
Each time it's used
A cutting flame that has an excess amount of oxygen is called a
Oxidizing flame
First step in shutting down the oxyfuel cutting equipment is to
Close the fuel gas cylinder valve
A empty cylinder must be marked MT near the _______ of the cylinder
Top
When cutting thin steel with oxyfuel cutting equipment, hold the torch so that the
tip is pointing in the direction the torch the torch is traveling at a ______ degree
angle
15- to 20-
_________ is used when you want the maximum residence to corrosion
Stainless steel
14" pipe and over is measured by
Outside diameter
Up to 14" pipe is measured by
Inside diameter
Pipe wall thickness is described in two ways: manufactures weight and
Schedule
The strongest pipe fittings are
Banded
A fitting that sends fluid back in the same direction from which it came is a
Return bend fitting
To join pipes of different sizes, pipefitters use reducers and
Bushings
Short threaded pieces on both ends is called a
Nipple
The weakest type of flange used only on low pressure lines is a
Screw on flange
Drawings that show a system from both elevation and plan view is a
Isometric drawing
The last part of a piping line number provides the
Specifications book reference number
The national pipe thread has an internal and external thread taper of
1/16 per inch
The additional turning of a fitting with a wrench after it is hand tightened is called
wrench
Makeup
Wrench make up on properly cut threads is usually about
Three complete rotations
complete solution
When OXY fuel cutting boots should be at least
8" tall
Are the most effective hearing protection
Disposable ear plugs
Reduces risk of flash burn
Safety glasses with properly tinted lenses
Combining pure oxygen with a burning material causes a fire to
Burn and flare out of control
In hollow steel cylinders oxygen is stored at more than
2,000 pounds per square inch (psi)
Largest oxygen cylinder holds about
485 cubic feet of oxygen
Most common size oxygen cylinder for welding/cutting is
227 cubic square feet of oxygen
Cylinders are stamped with gas name on
Shoulder of cylinder
When acetylene is mixed with oxygen the acetylene caused flame to burn hotter
than
5500°
Wait at least_______ before usuing a tipped over acetylene bottle
30 min
Safety plugs on top and bottom of cylinders melt at
220°
Methylacetylene propadiene (MAPP) gas is a combination of acetylene and
Propane or propylene-raw form of propane
When oxy fuel cutting propylene mixtures burn at about
5193°
If a high volume of gas is removed from a liquefied cylinder the pressure
Drops and the temperature of the cylinder drops also
Oxygen cylinders always have
Right handed threads on all connections
As a reminder that the regulator on a cylinder has left handed threads, a V-notch
is sometimes cut around the
Nut
Oxygen hoses are usually
Green or black
Acetylene hoses are always
Red
On a combination cutting torch, the primary fuel gas and oxygen valves are
located on
Torch handle
, The selection of a cutting torch tip depends on the thickness of the base metal
being cut and the
Kind of fuel gas being used
The special cutting tip for cutting off bolt heads and nuts is called a
Rivet cutting tip
A oxyfuel cutting torch should be checked for leaks
Each time it's used
A cutting flame that has an excess amount of oxygen is called a
Oxidizing flame
First step in shutting down the oxyfuel cutting equipment is to
Close the fuel gas cylinder valve
A empty cylinder must be marked MT near the _______ of the cylinder
Top
When cutting thin steel with oxyfuel cutting equipment, hold the torch so that the
tip is pointing in the direction the torch the torch is traveling at a ______ degree
angle
15- to 20-
_________ is used when you want the maximum residence to corrosion
Stainless steel
14" pipe and over is measured by
Outside diameter
Up to 14" pipe is measured by
Inside diameter
Pipe wall thickness is described in two ways: manufactures weight and
Schedule
The strongest pipe fittings are
Banded
A fitting that sends fluid back in the same direction from which it came is a
Return bend fitting
To join pipes of different sizes, pipefitters use reducers and
Bushings
Short threaded pieces on both ends is called a
Nipple
The weakest type of flange used only on low pressure lines is a
Screw on flange
Drawings that show a system from both elevation and plan view is a
Isometric drawing
The last part of a piping line number provides the
Specifications book reference number
The national pipe thread has an internal and external thread taper of
1/16 per inch
The additional turning of a fitting with a wrench after it is hand tightened is called
wrench
Makeup
Wrench make up on properly cut threads is usually about
Three complete rotations
