Pure oxygen is a molecule and is called _________________.

• air

• O₂

• O₃

• gas

Acetylene is a hydrocarbon molecule H₂C₂, the H & C stand for ________ __________.

• helium & carbon

• hydrogen & carbon

• hydrogen & copper

• helium & copper

To light the torch, the __________ valve must be opened first.

• air

• gasoline

• fuel

• oxygen

The acetylene is adjusted so the smoke disappears.

• True

• False

The oxygen valve is opened on and adjusted to obtain a __________ flame

• purple

• feather

• hot

• neutral

When shutting down the torch, the fuel gas is turned off first.

• True

• False

With the oxygen and acetylene properly adjusted the temperature of the flame is ____________ degrees.

• 60,000

• 2,800

• 6,000

• 4,000

When starting to cut steel, the blue cones are off the plate 1/8" and waiting for the steel to turn red.

• True

• False

At the _____________ temperature, steel is ready to burn.

• high

• kindling

• burning

• red

When the steel is hot enough, the cutting oxygen lever is pushed and the steel starts to ___________.

• burn

• oxidise

• widdle

• melt