Exam 7: Flame Cutting Equipment, Setup, and Operation

Explain what happens on the molecular level when a mixture of acetylene and oxygen is ignited.

The ____________________ or rate of propagation of a flame is the speed at which the flame burns.

What are the safety release devices on a regulator, and how do they work?

____________________ produces only a primary combustion flame, unlike hydrocarbon gases, which have both primary and secondary combustion.

Which of the following metals are easy to cut using oxyfuel gas cutting?

____________________ gas is mostly methane and ethane.

If the cutting tip seat or the torch head seat is damaged, ____.

Acetylene is unstable at temperatures above ____ Fahrenheit.

Explain what happens, on the molecular level, in the primary and secondary combustion of acetylene.

What is an advantage of having two oxygen regulators on a machine-cutting torch?

Acetylene is unstable at pressures above ____ psig.

Which of the following determines the amount of preheat flame required to make a cut?

The ____________________ is a pressure difference caused by the resistance of a gas as it flows through a line.

Of the following fuel gases, which has the slowest burn rate?

____ contains little or no unoxidized iron.

When metal is burned away, ____.

Explain why a cutting torch should never be used to open a used can, drum, tank, or other sealed container.

If the cutting stream is too fast, ____.

What color should most steels be at before a cut is started?

____________________ slag is very porous, brittle, and easily removed from a cut.