Mr. Navarro's Chapter 7 Exam

Why is the body on a manual plasma torch made from a special type of plastic?

• resistant to high temperatures

• resistant to ultraviolet light

• impact resistant

• all of the above statements are true

How are the torch heads of a plasma torch cooled?

• using air

• using water

• both a and b

• they do not have to be cooled

How have copper/tungsten tips helped the plasma torch?

• improve the quality of the work

• heat generated at the tip to be conducted away faster

• lengthens the life of the tip

• all of the above statements are true

What provides the gap between the electrode tip and the nozzle tip?

• nozzle tip

• nozzle insulator

• electrode setback

What factors must be considered when selecting a material for plasma arc gas hoses?

• special heat-resistant, ultraviolet-light-resistant plastic

• color matched to the cutter

• old and greasy hoses are ok

What type of voltage is required for a plasma cutting torch?

• any current is acceptable

• 18-45 volts are required

• 50-400 volts are required

Why do plasma cuts have little or no distortion?

• the heat-affected zone does not expand as much

• cuts will be distorted either way

What metals can be easily cut using the PAC process?

• carbon steel up to 1"

• stainless steel up to 4"

• aluminum up to 6"

• any material that is electrically conductive

• all of the above are correct

What happens to torches without drag nozzle tips if the standoff distance is not maintained?

• it can short out by an arc forming instantly destroying the tip

• there is no danger with touching the tip to the metal

What are the two methods for establishing the plasma path to the metal being cut.

• striking arc method and twisting arc method

• high-frequency alternating current and momentarily shorting the electrode tip and nozzle tip