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Worksheets29103-15 Plasma Arc Cutting
Total questions: 15
Worksheet time: 8mins
In plasma-arc cutting, plasma is created by _____.
combining acetylene with acetone
exposing cutting gas to radioactive material
passing fuel gases through a large orifice inside the torch
superheating gas in an electric arc
In most cases, plasma-arc cutting is _____.
slower and less efficient than other cutting methods
faster and more efficient than other cutting methods
more likely to create large amounts of dross than other cutting methods
more likely to create a large heat-affected zone than other cutting methods
Which of the following PPE is considered optional for plasma-arc cutting?
Hearing protection
Safety glasses
A full leather hood
High-top shoes or boots
Which of the following safety statements related to plasma-arc cutting is true?
A hot-work permit is not required for plasma-arc cutting due to the nature of the process.
Both methane and propane are lighter than air and rise quickly from the work area if
released.
Never carry matches or gas-filled lighters in your pockets.
Unlike oxyfuel cutting, a vessel can be cut safely with plasma regardless of its contents.
The simplest plasma-arc cutting units use filtered _____.
carbon dioxide
nitrogen
compressed air
helium
Industrial plasma cutting units can cut carbon steel up to _____.
1" thick
3" thick
5" thick
7" thick
The most common plasma-arc cutting torch uses _____.
a pilot arc with the transferred arc process
a pilot arc with the nontransferred arc process
contact starting with the oxyfuel pilot process
discharge starting with the common arc process
The typical plasma arc cutting torch contains a _____.
deflector, retaining cup, extended nozzle, and extended electrode
gouge shield, retaining cup, gouging nozzle, and standard bronze electrode
deflector, gouge shield, retaining cup, and copper electrode
retaining cup, copper electrode with a hafnium or thoriated tungsten insert, gas swirl ring, and nozzle
The term standoff distance refers to the _____.
distance between the torch internal arc and the workpiece
length of the plasma arc
distance between the area being cut and the workpiece clamp
distance between the torch tip and the workpiece
Most heavy-duty plasma-arc cutting systems require one gas cylinder containing the cutting gas and another containing _____.
shielding or cooling gas
water vapor
acetylene
a mixture of cutting gas and shielding gas
Some light-duty PAC equipment has a built-in _____.
water tank
argon gas cylinder
air compressor
battery-operated power supply
Cutting a 2" (5 cm) aluminum plate requires a(n) _____.
low gas flow rate
high-cutting amperage
low-cutting amperage
oxygen/air plasma/shield gas combination
To pierce very thin metal using plasma-arc cutting, hold the torch at a _____.
0-degree work angle
10-degree work angle
33-degree work angle
45-degree work angle
When gas cylinders are disconnected from a plasma-arc cutting unit before it is stored, be sure to _____.
install a cap on the regulator outlet
set the regulator to its maximum setting
lay all cylinders down on their side
replace the cylinder caps
Sputtering or hissing of the torch is often caused by _____.
metal debris in the heat shield
using air that does not contain sufficient oil
using air that does not contain sufficient moisture
moisture entering the unit through the air line
