Deck 7: Flame Cutting Equipment, Setup, and Operation

Question 1

A machine cutting torch is sometimes referred to as a(n) ____.

A) portable cutting torch
B) line burner
C) hand torch
D) combination torch

Answer 1

B

Question 2

Most cutting tips are made of ____.

A) copper alloy
B) stainless steel
C) cast iron
D) nickel alloy

Answer 2

A

Question 3

A molecule of propane is made up of ____.

A) one propyl and one carbon atom
B) one oxygen and one hydrogen atom
C) two hydrogen and two carbon atoms
D) eight hydrogen and three carbon atoms

Answer 3

D

Question 4

What is the finished flame product of reducing oxyhydrogen?

A) Carbon dioxide
B) Water
C) Carbon monoxide
D) Hydrogen peroxide

Question 5

The higher the combustion rate of an oxygen fuel mixture, the more prone the mixture is to ____.

A) burnthrough
B) flashback
C) ignition
D) secondary combustion

Question 6

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

A) 2.7
B) 12.7
C) 22.7
D) 32.7

Question 7

A molecule of acetylene is made up of ____.

A) one acetone atom and one carbon atom
B) two oxygen atoms and two carbon atoms
C) one hydrogen atom and one carbon atom
D) two hydrogen atoms and two carbon atoms

Question 8

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

A) High nickel steels
B) Cast iron
C) Stainless steels
D) Steel with less than 0.3% carbon

Question 9

The number of preheat holes determines the ____.

A) amount of preheat flame required
B) type of fuel gas to be used
C) arc length
D) kindling temperature

Question 10

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

A) Arc length, material thickness, and cutting tip diameter
B) Amperage, cutting tip diameter, and type of fuel gas
C) Material shape, arc length, and amperage
D) Type of fuel gas and material thickness, shape, and surface condition

Question 11

The final products of all clean-burning hydrocarbon flames are ____.

A) oxygen and carbon
B) carbon dioxide and hydrogen
C) water vapor and oxygen
D) water vapor and carbon dioxide

Question 12

Acetylene is unstable at temperatures above ____ Fahrenheit.

A) 1435 °
B) 1535 °
C) 1635 °
D) 1735 °

Question 13

The heat produced by the secondary flame of an MPS gas is about ____ the heat of acetylene.

A) half
B) the same as
C) twice
D) three times

Question 14

Acetylene is produced by mixing ____.

A) acetyl alcohol and carbon
B) calcium carbide and water
C) carbon and water
D) acetyl alcohol and water

Question 15

Acetylene is unstable at pressures above ____ psig.

A) 30
B) 50
C) 70
D) 100

Question 16

Hydrocarbons are made up of ____.

A) hydrogen and carbon
B) oxygen and hydrogen
C) oxygen and carbon
D) oxygen, hydrogen, and carbon

Question 17

The mixing chamber may be located in ____.

A) the torch body or the tip
B) a separate location in the welding shop
C) the portable mixing machine
D) the oxygen tube

Question 18

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

A) Acetylene
B) Natural gas
C) Propane
D) Hydrogen

Question 19

Of the following fuel gases, which has the fastest burning velocity?

A) Acetylene
B) Natural gas
C) Propane
D) Hydrogen

Question 20

The ____ determines the thickness of the metal that can be cut.

A) arc length
B) current
C) cutting tip diameter
D) fuel gas

Question 21

Inside a regulator gauge is the C -shaped ____.

A) safety disc
B) Bourdon tube
C) safety cylinder
D) diaphragm

Question 22

The torch pressure is always ____ the working pressure shown on the gauge.

A) less than
B) the same as
C) greater than
D) much greater than

Question 23

To obtain the absolute pressure, ____.

A) read the gauge pressure
B) add the atmosphere pressure to the gauge pressure
C) subtract the atmospheric pressure from the gauge pressure
D) multiply the atmospheric pressure by the gauge pressure

Question 24

Acetylene is used in tips having ____ preheat holes.

A) one to three
B) one to six
C) three to five
D) three to eight

Question 25

When metal is burned away, ____.

A) oxygen forms an iron oxide
B) oxygen forms iron dioxide
C) the iron turns to cast iron
D) the iron turns to oxygen

Question 26

To start a cut on the edge of a plate, ____.

A) hold the torch at a 45 degree angle
B) hold the torch at a right angle or pointed slightly away from the edge
C) point the torch toward the edge
D) hold the torch at a 10 degree angle, pointed away from the edge

Question 27

The size of a hose is the ____ of the hose.

A) inside circumference
B) outside circumference
C) inside diameter
D) outside diameter

Question 28

The ____ gauge is used to indicate the amount of gas that remains in a cylinder.

A) working
B) cylinder
C) Bourdon
D) high-pressure

Question 29

If an excessive amount of preheat flame is used, ____.

A) the cutting stream may gouge the side of the cut
B) the top edge may be melted or rounded off
C) the cut may be incomplete
D) the sides of the kerf may be dished

Question 30

When removing a cutting tip, if the tip is stuck in the torch head, ____.

A) cut off the tip and discard it
B) discard the torch head
C) tap the back of the head with a plastic hammer
D) tap the side of the tip with a plastic hammer

Question 31

If a large cutting tip pops when the acetylene is turned off, ____.

A) turn the oxygen off first
B) turn the acetylene back on
C) it is defective and must be discarded
D) it must be repaired

Question 32

Oxygen manifolds must be at least ____ feet away from fuel gas manifolds.

A) 5
B) 10
C) 15
D) 20

Question 33

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

A) flashback arrestor
B) reverse flow
C) safety release valve
D) safety disc

Question 34

The space produced during the cutting process is the ____.

A) coupling distance
B) cut gap
C) kerf
D) drag

Question 35

The pressure shown on a gauge is read as ____ .

A) pounds per square inch
B) foot-pounds
C) kilograms per square inch
D) kilojoules

Question 36

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

A) it must be discarded
B) it can be repaired using a plastic hammer
C) it can be repaired using a reamer
D) it can be cut apart and welded back together

Question 37

____ cylinders have connections so that either liquid or vapor can be drawn out of the cylinder.

A) Acetylene
B) Cryogenic
C) Oxygen
D) Liquid petroleum gas

Question 38

In a two-stage regulator, the first spring ____.

A) is adjusted like other regulators
B) can be larger, allowing a greater flow
C) is preset at the factory to reduce pressure to 225 psig
D) has to control a maximum pressure of only around 225 psig

Question 39

If a cut is to be started in a place other than the edge of the plate, ____.

A) the inner cones should be held as close as possible to the metal
B) the inner cones should be as far as possible from the metal
C) hold the torch at a right angle and pointing slightly away from the plate
D) hold the torch at a 45 degree angle, pointing slightly toward the plate

Question 40

The kindling temperature of iron is ____.

A) 600 degrees Fahrenheit
B) 1000 degrees Fahrenheit
C) 1200 degrees Fahrenheit
D) 1600 degrees Fahrenheit

Question 41

If the cutting stream is too fast, ____.

A) the cutting stream may gouge the side of the cut
B) the top edge may be melted or rounded off
C) the cut may be incomplete
D) the sides of the kerf may be dished

Question 42

What are some of the various oxyfuel cutting specialties that can be found on a job?

A) Flame cutting
B) Gouging
C) Beveling
D) All of the above

Question 43

How is a torch tip seal checked for a leak?

A) Place your finger over the end of the tip and spray the fitting with a leak detector.
B) Turn on the oxygen valve and spray the tip with leak-detecting solution.
C) Put the cutting head in the cooling tank and look for bubbles.
D) Clean the fitting with a dry clean rag, and tighten the fitting with a 12 in. adjustable wrench.

Question 44

Which organization has a standard numbering system for sizing cutting tips?

A) American Welding Society
B) OSHA
C) National Bureau of Standards
D) There is no standard

Question 45

____ contains little or no unoxidized iron.

A) Soft slag
B) Hard slag
C) Magnesium
D) Zinc

Question 46

In some cylinders a(n) ____________________ tube is used to improve the mixing of the gas by causing the liquid to be agitated as it is used.

Question 47

In a cutting torch, ____________________ is mixed with the fuel gas to form a high-temperature preheating flame.

Question 48

Most hand torches will not easily cut metal that is more than ____ inches thick.

A) three to five
B) five to seven
C) seven to ten
D) ten to twelve

Question 49

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

Question 50

Gauges that do not read ____ when the pressure is released must be repaired or replaced.

A) 0 psig
B) 14 psig
C) 45 psig
D) 100 psig

Question 51

____________________ gas is mostly methane and ethane.

Question 52

An infrared analysis or ____________________ of the flame gives the highest temperature in the flame.

Question 53

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

A) It allows the cutting pressure to be adjusted without affecting the torch flame.
B) It makes it easier to light the torch.
C) It allows air to be used instead of oxygen for the flame.
D) It makes it possible to change cylinders during a cut without stopping the cut.

Question 54

Combination cutting and welding sets are often used in ____________.

A) auto body shops
B) small welding shops
C) schools
D) All of the above

Question 55

Most fuel gases used for welding are ____________________.

Question 56

If the pressure setting is too high, ____.

A) the cutting stream may gouge the side of the cut
B) the top edge may be melted or rounded off
C) the cut may be incomplete
D) the sides of the kerf may be dished

Question 57

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

Question 58

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

A) Bright red
B) White
C) Dull red
D) Yellow hot

Question 59

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

Question 60

When cutting pipe freehand, if the pipe is larger than three inches in diameter, ____.

A) the torch tip is always pointed away from the center of the pipe
B) the torch tip is always pointed toward the center of the pipe
C) the torch tip is held straight up and down
D) the torch tip is held straight down

Question 61

When cutting ____________________ diameter pipe, the torch tip is held straight up and down and moved from the center to each side.

Question 62

What are the piping requirements for manifolds?

Question 63

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

Question 64

The distance from the inner cones of the flame to the surface of the plate is known as the ____________________ distance.

Question 65

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

Question 66

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

Question 67

What are the factors that affect the accuracy of fuel-gas flame temperature and heat readings?

Question 68

When cutting ____________________ diameter pipe, the torch tip is always pointed toward the center of the pipe.

Question 69

How do you test a diaphragm for leaks?

Question 70

Often called ____________________, machine cutters have a motorized carrier with adjustable speed control that holds a machine-cutting torch and travels along a track.

Question 71

Describe how the welder should be positioned when hand cutting.

Question 72

____________________ slag is attached solidly to the bottom edge of a cut and requires chipping and grinding to remove.

Question 73

Explain the procedure for testing leaks around a valve stem.

Question 74

If ____________________ is used in tips designed for other fuel gases, the tip may overheat.

Question 75

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

Question 76

What is backfire and what are its causes?

Question 77

The ____________________ is the lowest temperature at which a material will burn.

Question 78

The distance that the bottom of the cut is behind the top is known as the ____________________.

Question 79

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

Question 80

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