WorksheetsPlasma Arc Cutting
Total questions: 38
Worksheet time: 19mins
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 g
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
sing air that does not contain sufficient moisture
moisture entering the unit through the air line
In most cases, PAC is ___________ & more ____________ than other cutting methods.
Faster & Efficient
Faster, less efficient
slower and efficient
slower and less efficient
Sputtering or hissing of the torch is often caused by _____________ entering the unit through the air line.
moisture
air
carbon
dust
A full leather hood __________.
is considered optional PPE for plasma arc cutting
is required
is not a good idea
causes heat strokes
Never carry matches or gas-filled lighters in your pockets. True or False
True
False
When operating plasma arc cutting equipment, it is acceptable to wear a hat made of __________.
100% Cotton
100% Leather
100% nylon
100% polyester
The duty-cycle range for a light duty unit is typically _________.
35%
30%
25%
80%
The typical plasma arc cutting torch usually contains a replaceable retaining cup, comprised of a copper electrode with a(n) _______.
hafnium or thoriated tungsten insert
helium or thoriated tungsten insert
hafnium or carbon tungsten insert
hafnium or oxygen tungsten insert
Some types of PAC torches inject water to create a whirlpool of water around the jet to ________..
cut with a more uniform melt rate
heated with a more uniform melt rate
cut with a less uniform melt rate
cut with a non uniform melt rate
To remove, attach, or tighten the regulator's connection to a gas cylinder, you would use _______.
an adjustable wrench or correctly sized open-end wrench
an adjustable hammer or correctly sized open-end wrench
an adjustable hose or correctly sized open-end wrench
an adjustable wire or correctly sized open-end wrench
If the PAC equipment exhibits a moisture problem, you should first _______.
drain the air filter/moisture separator bowl
refill the air filter/moisture separator bowl
heat the air filter/moisture separator bowl
freeze the air filter/moisture separator bowl
To pierce very thin metal with a PAC torch you should ______..
hold the torch directly over the point to be pierced at a 0-degree work angle
hold the torch directly over the point to be pierced at a 45-degree work angle
hold the torch directly over the point to be pierced at a 50-degree work angle
hold the torch directly over the point to be pierced at a 90-degree work angle
hold the torch directly over the point to be pierced at a 0-degree work angle
30,000 F
20,000 F
50,000 F
90,000 F
There are
2 types of plasma arc cutting process
4 types of plasma arc cutting process
6 types of plasma arc cutting process
8 types of plasma arc cutting process
State of matter found in region of an electrical discharge or arc
Plasma
liquid
gas
solid
Plasma is created by super heating gas in an electric arc, the temperature of the arc is around ________________ and also creates a/an __________________________.
43,000 degrees / ultraviolet light
20,000 degrees / ultraviolet light
30,000 degrees / ultraviolet light
50,000 degrees / ultraviolet light
What creates and controls plasma for cutting?
A Plasma torch
A Plasma wire
A Plasma wrench
A Plasma base
On the plasma torch, what are the consumables that need to be replaced when necessary?
Electrode, nozzle insulator, nozzle tip, and nozzle
just a nozzle
just a nozzle tip
just a nozzle insulator
One square cutting thick metal, a square edge on the desired piece can be created and maintained by
Holding the torch at a slight angle, leaning toward the desired piece
Holding the torch at a slight angle, leaning away from the desired piece
Holding the torch at a slight angle, leaning parallel the desired piece
Holding the torch at a slight angle, leaning opposite the desired piece
In the transferred arc process, the workpiece is
Part of the electrical circuit
Part of the air circuit
Part of the metal circuit
Part of the water circuit
To pierce very THICK metal, start by holding the torch at a
10-degree work angle
0-degree work angle
45-degree work angle
90-degree work angle
When performing plasma arc cutting near a battery, the operator should remove the battery to prevent
a hydrogen gas explosion caused by a cutting spark
leakage
water leak
oil leak
When performing plasma arc cutting near a battery, the operator should remove the battery to prevent
a hydrogen gas explosion caused by a cutting spark
leakage
water leak
oil leak
When performing plasma arc cutting near a battery, the operator should remove the battery to prevent
a hydrogen gas explosion caused by a cutting spark
leakage
water leak
oil leak
