welding 3

the most suitable cutting process to use on ferrous metals such as straight carbon steel is _____

• carbon arc cutting

• oxyfuel cutting

• powder cutting

• plasma are cutting

the oxidation that occurs during an oxyfuel cutting operation is similar to a greatly sped-up _____

• tempering process

• annealing process

• rusting process

• crystallizing process

for long-term cutting of materials containing cadium or mercury, always wear an approved _____

• supplied air respirator

• metal-fume filter

• HEPA-rated filter

• standard respirator

when performing oxyfuel cutting, it is acceptable to wear _____

• a cap and safety glasses

• a face shield over safety glasses

• a hard hat and sunglasses

• a vented mesh cotton hood

two types of gases that tend to concentrate in and along low areas are _____

• acetylene and propylene

• methane and butane

• propylene and propane

• butane and propane

oxygen cylinders must be tested ____

• annually

• every three years

• every fire years

• every ten years

combining pure oxygen with a burning material causes a fire to _____

• burn rapidly and violently

• pop loudly and exstinguish

• die down and then flare up

• burn cooler and more slowly

in the top and bottom of an acetylene cylinder are safety plugs with melting point of _______

• 212 degees

• 260 degrees

• 300 degrees

• 330 degrees

three fuel gases other than acetylene used for cutting include _____

• argon, oxygen, and helium

• methane, butane, and oxygen

• natural gas, propylene, and propane

• benzene, halon, and fluorine

as a reminder that the regulator on a cylinder has left-handed threads, a V-notch is sometimes cut around the _____

• regulator

• cylinder

• threads

• nut