Plasma Cutting

Plasma is a ____.

• metal heated and electrified to its melting point
• gas superheated and ionized to become electrically conductive
• welding bead heated to its melting point
• superheated and electrified liquid under pressure

Solid, liquid, gas, and plasma are the four ____.

• chemical compositions
• types of atomic bonds
• states of matter
• forms of ionization

Which of the following materials can be plasma cut?

• All metals
• Plastic
• Wood
• All of the above

Which of the following is not an advantage of plasma cutting over oxyfuel cutting?

• A smaller heat-affected zone
• Lower-temperature cuts
• Easier clean up
• A narrower kerf

Which of the following cannot be cut with plasma?

• Plastic
• Nonferrous metals
• Aluminum
• Stainless steel

The power source for a plasma cutter is a constant ____.

• potential AC power source
• current AC power source
• current DC power source
• potential DC power source

A diffuser, also known as a swirl ring, ____.

• diffuses gas at the end of the cut
• creates high energy to ionize plasma
• causes the gas to swirl and energize
• All of the above.

A drag shield on a plasma cutter ____.

• protects the nozzle from dross
• shields the nozzle from high current
• prevents the nozzle from touching the base metal
• All of the above.

The most common compressed gas for plasma cutting is ____.

• acetylene
• pure oxygen
• nitrogen shielding gas
• compressed air from a shop compressor

The major drawback to using compressed air is ____.

• gas is reused
• water vapor
• nitrogen in the dross
• the need for a high-capacity compessor