Question 1

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

Accepted Answer

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

Question 2

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

Accepted Answer

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

Question 3

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

Accepted Answer

​If a mixture of acetylene (C2H2) and ox

Question 4

​The oxygen and ____________________ flame is the only 100% nonpolluting fuel-gas flame.

Accepted Answer

The answer of ​The oxygen and ____________________ flame is the...

Question 5

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

Accepted Answer

Regulators may be equipped with either a

Question 6

A(n) ____________________ torch must be used if a low-pressure acetylene generator or low-pressure residential natural gas is used as a fuel-gas supply.

Accepted Answer

injector-t

Question 7

Which of the following is true of a flashback?

Accepted Answer

A)  It produces a low whistle. 
B)  When it occurs, the fuel valve should be closed first, followed by the oxygen valve. 
C)  A flame is burning back inside the tip, torch, hose, or regulator. 
D)  The valves should be closed slowly. 
A)  It produces a low whistle. 
B)  When it occurs, the fuel valve should be closed first, followed by the oxygen valve. 
C)  A flame is burning back inside the tip, torch, hose, or regulator. 
D)  The valves should be closed slowly.

Question 8

​Most fuel gases used for welding are ____________________.

Accepted Answer

The answer of ​Most fuel gases used for welding are...

Question 9

​____________________ is used inside acetylene cylinders to absorb the gas and make it more stable.

Accepted Answer

The answer of ​____________________ is used inside acetylene cylinders to...

Question 10

​A molecule of propane is made up of ____.

Accepted Answer

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 
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

Question 11

​Acetone absorbs about ____ times its own weight in acetylene.

Accepted Answer

A)  ​14 
B)  ​24 
C)  ​34 
D)  ​44 
A)  ​14 
B)  ​24 
C)  ​34 
D)  ​44

Question 12

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

Accepted Answer

The answer of The ____________________ is a pressure difference caused...

Question 13

​If more than one torch is to be used with a cylinder, the draw rates of the tips should be ____ to obtain the number of cylinders that must be manifolded together.

Accepted Answer

A)  ​added 
B)  ​subtracted 
C)  ​multiplied 
D)  ​divided 
A)  ​added 
B)  ​subtracted 
C)  ​multiplied 
D)  ​divided

Question 14

Hoses are available in four sizes: ____.

Accepted Answer

A)  3/16 in., 5/16 in., 3/8 in., 5/8 in. 
B)  3/16 in., 1/4 in., 5/16 in., 3/8 in. 
C)  1/4 in., 5/16 in., 3/8 in., 7/16 in. 
D)  1/4 in.5/16 in., 3/8 in., 5/8 in. 
A)  3/16 in., 5/16 in., 3/8 in., 5/8 in. 
B)  3/16 in., 1/4 in., 5/16 in., 3/8 in. 
C)  1/4 in., 5/16 in., 3/8 in., 7/16 in. 
D)  1/4 in.5/16 in., 3/8 in., 5/8 in.

Question 15

​What is the minimum tensile strength range of a class RG45 welding rod?

Accepted Answer

A)  ​25,000 to 35,000 psi 
B)  ​35,000 to 45,000 psi 
C)  ​45,000 to 55,000 psi 
D)  ​55,000 to 65,000 psi 
A)  ​25,000 to 35,000 psi 
B)  ​35,000 to 45,000 psi 
C)  ​45,000 to 55,000 psi 
D)  ​55,000 to 65,000 psi

Question 16

​What is the minimum tensile strength of a class RG65 welding rod?

Accepted Answer

A)  ​35,000 to 45,000 psi 
B)  ​45,000 to 55,000 psi 
C)  ​55,000 to 65,000 psi 
D)  ​65,000 to 75,000 psi 
A)  ​35,000 to 45,000 psi 
B)  ​45,000 to 55,000 psi 
C)  ​55,000 to 65,000 psi 
D)  ​65,000 to 75,000 psi

Question 17

What are the piping requirements for manifolds?

Accepted Answer

Piping for the high-pressure side of a m

Question 18

​A molecule of acetylene is made up of ____.

Accepted Answer

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 
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 19

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

Accepted Answer

A)  ​burn-through 
B)  ​flashback 
C)  ​ignition 
D)  ​secondary combustion 
A)  ​burn-through 
B)  ​flashback 
C)  ​ignition 
D)  ​secondary combustion

Question 20

A(n) ____________________ will do the job of a reverse flow valve, and it will also stop the flame of a flashback.

Accepted Answer

The answer of A(n) ____________________ will do the job of...

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

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

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

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

​The oxygen and ____________________ flame is the only 100% nonpolluting fuel-gas flame.

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

A(n) ____________________ torch must be used if a low-pressure acetylene generator or low-pressure residential natural gas is used as a fuel-gas supply.

Which of the following is true of a flashback?

​Most fuel gases used for welding are ____________________.

​____________________ is used inside acetylene cylinders to absorb the gas and make it more stable.

​A molecule of propane is made up of ____.

​Acetone absorbs about ____ times its own weight in acetylene.

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

​If more than one torch is to be used with a cylinder, the draw rates of the tips should be ____ to obtain the number of cylinders that must be manifolded together.

Hoses are available in four sizes: ____.

​What is the minimum tensile strength range of a class RG45 welding rod?

​What is the minimum tensile strength of a class RG65 welding rod?

What are the piping requirements for manifolds?

​A molecule of acetylene is made up of ____.

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

A(n) ____________________ will do the job of a reverse flow valve, and it will also stop the flame of a flashback.

Introduction to Welding

Safety in Welding

Shielded Metal Arc Equipment, Setup, and Operation

Shielded Metal Arc Welding of Plate

Shielded Metal Arc Welding of Pipe

Shielded Metal Arc Welding Aws Sense Certification

Flame Cutting

Plasma Arc Cutting

Related Cutting Processes

Gas Metal Arc Welding Equipment, Setup, and Operation

Gas Metal Arc Welding

Flux Cored Arc Welding Equipment, Setup, and Operation

Flux Cored Arc Welding

Gas Metal Arc and Flux Cored Arc Welding of Pipe

Gas Metal Arc and Flux Cored Arc Welding Aws Sense Certification

Gas Tungsten Arc Welding Equipment, Setup, Operation, and Filler Metals

Gas Tungsten Arc Welding of Plate

Gas Tungsten Arc Welding of Pipe

Gas Tungsten Arc Welding Plate and Pipe Aws Sense Certification

Shop Math and Weld Cost

Reading Technical Drawings

Welding Joint Design and Welding Symbols

Fabricating Techniques and Practices

Welding Codes and Standards

Testing and Inspection of Welds

Welding Metallurgy

Weldability of Metals

Filler Metal Selection

Welding Automation and Robotics

Other Welding Processes

Oxyacetylene Welding

Brazing, Braze Welding, and Soldering

Filters

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

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

The oxygen and ____________________ flame is the only 100% nonpolluting fuel-gas flame.

Most fuel gases used for welding are ____________________.

____________________ is used inside acetylene cylinders to absorb the gas and make it more stable.

A molecule of propane is made up of ____.

Acetone absorbs about ____ times its own weight in acetylene.

If more than one torch is to be used with a cylinder, the draw rates of the tips should be ____ to obtain the number of cylinders that must be manifolded together.

What is the minimum tensile strength range of a class RG45 welding rod?

What is the minimum tensile strength of a class RG65 welding rod?

A molecule of acetylene is made up of ____.

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