Oxy-fuel Cutting
The most suitable cutting process to use on ferrous metals such as straight carbon steel is _____.
a. carbon arc cutting
b. oxy-fuel cutting
c. powder cutting
d. plasma arc cutting
b. oxy-fuel cutting
Combining pure oxygen with a burning material causes a fire to _____.
a. burn rapidly and violently
b. pop loudly and extinguish
c. die down and then flare up
d. burn cooler and more slowly
a. burn rapidly and violently
The special cutting tip for cutting off bolt heads and nuts is called a _____.
a. gouging tip
b. flue cutting tip
c. rivet cutting tip
d. piercing tip
c. rivet cutting tip
How should gas cylinders be transported to a workstation?
a. Carried by hand with one worker on each end of the cylinder
b. Lying flat in a cylinder cart or truck
c. Rolled carefully by a qualified worker from the storage area
d. In an upright position on a hand truck or bottle cart
d. In an upright position on a hand truck or bottle cart
An oxyfuel cutting torch should be checked for leaks _____.
a. each time it is used
b. once a week
c. every month
d. after 1,000 hours
a. each time it is used
The hoses used to carry oxygen from the cylinder to the torch are usually _____.
a. red
b. blue
c. green
d. orange
c. green
The oxidation that occurs during an oxyfuel-cutting operation is similar to a greatly sped-up _____.
a. tempering process
b. annealing process
c. rusting process
d. crystallizing process
c. rusting process
In the top and bottom of an acetylene cylinder are safety plugs with a melting point of _____.
a. 212°F (100°C)
b. 260°F (126.7°C)
c. 300°F (148.9°C)
d. 330°F (165.6°C)
a. 212°F (100°C)
The selection of a cutting torch tip depends on the thickness of the base metal being cut and the _____.
a. size of the fuel hoses
b. size of the torch
c. type of fuel gas being used
d. size of the oxygen cylinder
c. type of fuel gas being used
What devices are often attached to the regulators, the torch, or both?
a. Flashback arrestors
b. Needle valves
c. Cutting orifices
d. Leak detectors
a. Flashback arrestors
When an empty cylinder has been removed from the workstation and stored, it must be marked MT (or the acceptable site notation for indicating an empty cylinder) _____.
a. near its top
b. on the middle of its side
c. on its bottom
d. on its lower third
a. near its top
What becomes less of a problem as the thickness of the steel being cut increases?
a. Distortion
b. Blowback
c. Backfire
d. Piercing
a. Distortion
For long-term cutting of materials containing cadmium or mercury, always wear an approved _____.
a. supplied air respirator
b. metal-fume filter
c. HEPA-rated filter
d. standard respirator
a. supplied-air respirator
Three fuel gases other than acetylene used for cutting include _____.
a. argon, oxygen, and helium
b. methane, butane, and oxygen
c. natural gas, propylene, and propane
d. benzene, halon, and fluorine
c. natural gas, propylene, and propane
Tip cleaners are _____.
a. strong detergents used to dissolve carbon buildup in torch tips
b. small round files used to remove impurities from a torch tip
c. solvent tanks and pumps used to force solvent through the tip openings
d. high-velocity nozzles used to blow debris from a torch tip
b. small round files used to remove impurities from a torch tip
What can occur when a torch tip or nozzle touches the work surface or when a bit of hot dross briefly interrupts the cutting flame?
a. Carburization
b. Backfire
c. Oxidation
d. Flashpoint
b. Backfire
Insufficient preheat during an oxy-fuel cutting operation is likely to result in _____.
a. the top surface melting over the cut
b. bad gouging at the bottom of the cut
c. a pronounced break in the drag-line
d. a wavy and irregular kerf
b. bad gouging at the bottom of the cut
The process of cutting a groove into a surface is known as _____.
a. gouging
b. washing
c. brushing
d. short-cutting
a. gouging
When performing oxyfuel cutting, it is acceptable to wear _____.
a. a cap and safety glasses
b. a face shield over safety glasses
c. a hard hat and sunglasses
d. a vented mesh cotton hood
b. a face shield over safety glasses
As a reminder that the regulator on a cylinder has left-handed threads, a V-notch is sometimes cut around the _____.
a. regulator
b. cylinder
c. threads
d. nut
d. nut
15. A track burner is a device used to _____.
a. cut railroad tracks
b. weld pipe
c. cut or bevel in a straight line
d. cut holes in plate
c. cut or bevel in a straight line
When a cutting job is completed, and the oxy-fuel equipment is no longer needed, the first step in shutting down the oxy-fuel cutting equipment is to _____.
a. close the fuel gas cylinder valve
b. back out the fuel gas and oxygen regulator adjusting screws
c. open the fuel gas torch valve
d. open the oxygen torch valve
a. close the fuel gas cylinder valve
To minimize distortion when cutting thin steel, _____. a. avoid preheating the metal before starting the cut
b. keep the cutting tip perpendicular to the metal's surface
c. move as quickly as possible without losing the cut
d. preheat the metal until it is near its melting point
c. move as quickly as possible without losing the cut
Gouging operations use a special tip that produces a low-velocity stream of oxygen that _____.
a. blows downward
b. pierces the workpiece
c. distorts the flame
d. curves upward
d. curves upward
Two types of gases that tend to concentrate in and along low areas are _____.
a. acetylene and propylene
b. methane and butane
c. propylene and propane
d. butane and propane
c. propylene and propane
A cutting flame with excess oxygen is called a(n) _____.
a. cold flame
b. neutral flame
c. carburizing flame
d. oxidizing flame
d. oxidizing flame
Oxygen cylinders must be tested _____.
a. annually
b. every three years
c. every five years
d. every ten years
d. every ten years
A carburizing flame has a white feather created by _____.
a. too much oxygen
b. too little carbon
c. too much fuel
d. too much vacuum
c. too much fuel
When cutting thin steel with oxy-fuel cutting equipment, point the torch tip in the direction the torch is traveling at a _____.
a. 10- to 12-degree angle
b. 15- to 20-degree angle
c. 21- to 25-degree angle
d. 30- to 35-degree angle
b. 15- to 20-degree angle
Portable oxyfuel track burners can be used for _____.
a. stationary cutting, but not bevel cutting
b. straight-line cutting and bevel cutting
c. movable cutting, but not straight-line cutting
d. both drag cutting and kerf less cutting
b. straight-line cutting and bevel cutting