Exam 31: Oxyfuel Welding and Cutting Equipment, Setup, and Operation

​Suppose the inner cone of a flame produces 430 Btu per cubic foot of gas, and the outer envelope produces 610 Btu per cubic foot of gas.What is the total heat produced by the flame?

Which of the following is true of regulators?

____________________ regulators have two sets of springs, diaphragms, and valves.

There are ____ basic methods for mixing oxygen and fuel gas to form a hot, uniform flame.

____________________ is rising pressure on the working side of the regulator.

The ____ is designed to quickly stop the flow of gas during a flashback.

A safety ____________________ is a thin piece of metal held between two seals that prevents excessively high pressures from damaging the regulator.

​Acetylene is unstable at pressures above ____ psig.

​What are the two major safety problems when hydrogen is used as a fuel gas?

How do you test a diaphragm for leaks?

Which of the following is a cause of a backfire?

The purpose of the ____ valve is to prevent gases from accidentally flowing through the torch and into the wrong hose.

​The number of oxygen atoms required to completely combust the fuel gas ____.

A regulator works by holding the forces on both sides of a(n) ____________________ in balance.

​A homogeneous mixture of 50% acetylene and 50% oxygen has a burn rate of ____ feet per second.

​____________________ is produced by smelting coke (a coal by-product) and lime in air-tight electric arc furnaces.

​Combining calcium carbide and water produces ____.

The pressure on a gauge is read as ____ gauge.

​Acetylene is unstable at temperatures above ____ Fahrenheit.

​Hydrocarbons are made up of ____.