Welding Plasma Arc Cutting 29103-15

In plasma arc cutting, plasma is created by ____.

• combining acetylene with acetone

• exposing cutting gas to radioactive material

• passing fuel gasses 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 are 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