Practice Test For Los Angeles City Welder Certification Closed Book Section
Practice Test for Los Angeles City Welder Certification Closed Book Section
Timed - you have 30 minutes to complete Multiple Choice Questions.
Questions and Answers
- 1.
The minimum length of an intermittent fillet weld
- A.
1"
- B.
1 1/4"
- C.
1 1/2"
- D.
1 3/4"
Correct Answer
C. 1 1/2"Explanation
The minimum length of an intermittent fillet weld is 1 1/2". This means that the weld should be at least 1 1/2" long. The intermittent fillet weld is a type of weld that is not continuous and is made up of a series of smaller welds. It is commonly used when the joint does not require a continuous weld. The minimum length requirement ensures that the weld is strong enough to withstand the intended load and provides sufficient bonding between the two pieces being joined.Rate this question:
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- 2.
How many times may a low hydrogen electrode be rebaked?
- A.
Not limited
- B.
Twice
- C.
Once, only after a 2 hour holding period
- D.
Once
Correct Answer
D. OnceExplanation
A low hydrogen electrode may be rebaked once. This is typically done to remove any moisture or contaminants that may have been absorbed during storage. However, it is important to note that rebaking should only be done once, as repeated rebaking can negatively affect the performance and quality of the electrode.Rate this question:
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- 3.
Fillet weld end return lengths have a maximum requirement of ___________ times the nominal size of the weld
- A.
1 1/2
- B.
4
- C.
2
- D.
3
Correct Answer
B. 4Explanation
The correct answer is 4. Fillet weld end return lengths have a maximum requirement of 4 times the nominal size of the weld. This means that the length of the return on the end of the fillet weld should be at least 4 times the size of the weld itself. This requirement ensures that the weld is strong and secure, providing sufficient reinforcement and preventing any potential failure or breakage.Rate this question:
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- 4.
What is the major function of the coating on an arc welding electrode?
- A.
Acts as a scavenger, removes oxides and impurities
- B.
Influences incomplete penetration
- C.
Liquefies the base metal
- D.
Adds moisture and accelerates the cooling rate
Correct Answer
A. Acts as a scavenger, removes oxides and impuritiesExplanation
The coating on an arc welding electrode acts as a scavenger by removing oxides and impurities. This is an important function because oxides and impurities can weaken the weld and affect its quality. By removing these substances, the coating helps to ensure a cleaner and stronger weld.Rate this question:
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- 5.
Square wave refers to the ____________.
- A.
shape of the filler metal
- B.
shape of the tungsten electrode
- C.
shape of the output power
- D.
shape of the power source control box
Correct Answer
C. shape of the output powerExplanation
The square wave refers to the shape of the output power. In welding, the output power is typically in the form of an electrical waveform. A square wave is a type of waveform that has a constant amplitude and alternates between two levels, typically high and low, in a square shape. This type of waveform is commonly used in certain welding processes, such as TIG (Tungsten Inert Gas) welding, where it helps to control the heat input and produce a stable arc.Rate this question:
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- 6.
What NDE process is indicated in the following description? Detects surface discontinuities only. It can also verify fit-up, joint configuration, weld dimensions and profiles.
- A.
PT
- B.
RT
- C.
MT
- D.
VT
Correct Answer
D. VTExplanation
The given description indicates the Visual Testing (VT) process. VT is a nondestructive examination method that involves inspecting the surface of a material or component to detect any visible discontinuities or defects. It is commonly used to verify fit-up, joint configuration, weld dimensions, and profiles. Unlike other NDE processes, such as PT (Penetrant Testing), RT (Radiographic Testing), and MT (Magnetic Particle Testing), VT specifically focuses on visual inspection.Rate this question:
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- 7.
Of the following which is not considered a joint?
- A.
Lap
- B.
Corner
- C.
Bevel
- D.
Edge
Correct Answer
C. BevelExplanation
A bevel is not considered a joint because it is a type of cut or angle that is made on the edge of a material, rather than a connection between two separate pieces. A lap joint is formed when two pieces overlap each other, a corner joint is formed when two pieces meet at a 90-degree angle, and an edge joint is formed when two edges are joined together. However, a bevel is a slanted or angled cut that is made on the edge of a material for various purposes such as aesthetics or to create a smooth transition between two surfaces.Rate this question:
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- 8.
The Los Angeles City certified welding license must be renewed every _________?
- A.
6 months
- B.
Year
- C.
2 years
- D.
3 years
Correct Answer
D. 3 yearsExplanation
The Los Angeles City certified welding license needs to be renewed every 3 years. This means that after obtaining the license, the welder must go through a renewal process every 3 years to ensure that their skills and knowledge are up to date. This requirement helps to maintain the quality and safety standards in the welding industry and ensures that certified welders are continuously trained and assessed.Rate this question:
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- 9.
Which of the following electrode(s) need shielding gas?
- A.
E71T-1
- B.
E71T-2
- C.
E71T3
- D.
Both E71T-1 and E71T-2
Correct Answer
D. Both E71T-1 and E71T-2Explanation
E71T-1 and E71T-2 electrodes both require shielding gas. Shielding gas is used in welding to protect the molten metal from atmospheric contamination, such as oxygen and nitrogen, which can cause defects in the weld. E71T-1 and E71T-2 electrodes are both classified as flux-cored arc welding (FCAW) electrodes, which means they have a flux-filled core that provides shielding to the weld. However, this flux alone is not sufficient to protect the weld from atmospheric contamination, so shielding gas is also required.Rate this question:
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- 10.
Arc strikes on the base metal shall be
- A.
Allowed on plate , not allowed on pressure pipe
- B.
Repaired with grinder
- C.
Allowed
- D.
Avoided
Correct Answer
D. AvoidedExplanation
Arc strikes on the base metal should be avoided. Arc strikes can cause damage to the base metal, leading to weakened structural integrity and potential failure. This is especially critical in pressure pipe applications where any damage can compromise the safety and functionality of the system. Therefore, it is essential to prevent arc strikes from occurring in the first place to ensure the quality and reliability of the base metal.Rate this question:
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- 11.
Field welding shall not be performed when the ambient temperature is
- A.
Lower than 0 degrees F
- B.
Above 0 degrees F
- C.
Over 120 degrees F
- D.
Below 102 degrees F
Correct Answer
A. Lower than 0 degrees FExplanation
Field welding should not be performed when the ambient temperature is lower than 0 degrees F because extremely cold temperatures can affect the quality and integrity of the weld. Cold temperatures can cause the metal to become brittle and increase the risk of cracking or failure. Therefore, it is important to avoid welding in such low temperatures to ensure the weld is strong and durable.Rate this question:
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- 12.
D1.1 structural code covers applications regarding carbon & low alloyed steels with a minimum yield strength of?
- A.
Not covered in the D1.1 structural code
- B.
100 KSI or less
- C.
No limit
- D.
100 KSI or more
Correct Answer
B. 100 KSI or lessExplanation
The correct answer is "100 KSI or less." This means that the D1.1 structural code covers applications that involve carbon and low alloyed steels with a minimum yield strength of 100 KSI or less.Rate this question:
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- 13.
Welding out of position with an EXX2X rod can cause?
- A.
Spatter
- B.
Overheating
- C.
Incomplete penetration
- D.
Undercut
Correct Answer
D. UndercutExplanation
Welding out of position with an EXX2X rod can cause undercut. Undercut is a type of weld defect where the base metal along the edges of the weld joint is melted and removed, creating a groove or depression. This can weaken the weld and compromise its integrity. Welding out of position, such as welding vertically or overhead, increases the likelihood of undercut due to the gravitational pull on the molten metal. Using an improper welding rod, like the EXX2X rod mentioned, can also contribute to undercutting as it may not provide sufficient control over the weld pool.Rate this question:
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- 14.
A break in the arrow shaft of a weld symbol would have significance in a ______________?
- A.
Bevel or j-groove
- B.
None
- C.
Bevel only
- D.
J-groove only
Correct Answer
A. Bevel or j-grooveExplanation
A break in the arrow shaft of a weld symbol would have significance in a bevel or j-groove. This is because the arrow shaft represents the location and direction of the weld, and a break in the arrow shaft indicates that the weld is not continuous along the entire length of the joint. In a bevel or j-groove joint, a break in the arrow shaft would indicate that the weld does not extend to the root of the joint, which could affect the strength and integrity of the weld.Rate this question:
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- 15.
When using the SMAW process the electrode is positive only when using?
- A.
DCSP
- B.
AC
- C.
NEVER
- D.
DCRP
Correct Answer
D. DCRPExplanation
When using the SMAW process, the electrode is positive only when using DCRP (Direct Current Reverse Polarity). In this polarity, the electrode is connected to the negative terminal of the power source, and the workpiece is connected to the positive terminal. This configuration allows for deeper penetration and better control over the weld pool. It is important to note that when using AC (Alternating Current), the polarity of the electrode constantly changes, and when using DCSP (Direct Current Straight Polarity), the electrode is connected to the positive terminal.Rate this question:
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- 16.
Low hydrogen electrodes end in what digits?
- A.
4,7,8
- B.
8,6,1
- C.
5, 6, 8
- D.
3,4,7
Correct Answer
C. 5, 6, 8Explanation
Low hydrogen electrodes are typically classified as E7018 or E7016. The last two digits of the electrode classification indicate the tensile strength of the weld metal in thousands of pounds per square inch (ksi). In this case, the correct answer is 5, 6, 8, which indicates that the weld metal has a tensile strength of 68 ksi.Rate this question:
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- 17.
The "S" in ERXXS-X wire represents?
- A.
Selected
- B.
Silicone
- C.
Solid
- D.
Stainless
Correct Answer
C. SolidExplanation
The "S" in ERXXS-X wire represents "Solid". This indicates that the wire is made of a single solid conductor, as opposed to being stranded or made of multiple smaller wires. Solid wires are typically used for applications that require a stable and consistent electrical connection, such as in residential and commercial wiring.Rate this question:
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- 18.
In GMAW, the welding variable controlled by the wire feed speed is?
- A.
Voltage
- B.
Current
- C.
Stickout
- D.
Arc length
Correct Answer
B. CurrentExplanation
In GMAW (Gas Metal Arc Welding), the welding variable controlled by the wire feed speed is the current. The wire feed speed determines the rate at which the welding wire is fed into the weld pool. This, in turn, affects the amount of current flowing through the wire and ultimately determines the heat input and penetration of the weld. By adjusting the wire feed speed, the welder can control the current and, consequently, the quality and strength of the weld.Rate this question:
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- 19.
What electrode is deep penetrating, can be used in all positions and can only be used on DCRP?
- A.
E6013
- B.
E7018
- C.
E6011
- D.
E6010
Correct Answer
D. E6010Explanation
The E6010 electrode is deep penetrating, meaning it can penetrate through thick materials effectively. It can be used in all positions, including overhead and vertical positions. However, it can only be used on Direct Current Reverse Polarity (DCRP) welding machines.Rate this question:
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- 20.
What suffix numbers in FCAW electrodes indicate the need for shielding gas?
- A.
1-6
- B.
7-11
- C.
1,2,5
- D.
5,6,8
Correct Answer
C. 1,2,5Explanation
The suffix numbers 1, 2, and 5 in FCAW electrodes indicate the need for shielding gas. This means that these specific electrodes require a shielding gas to protect the weld from atmospheric contamination and ensure proper weld quality.Rate this question:
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- 21.
All prequalified WPS shall be prepared by the ___________?
- A.
Both a & b
- B.
Contractor/fabricator
- C.
Welder
- D.
Inspector
Correct Answer
B. Contractor/fabricatorExplanation
The correct answer is contractor/fabricator. The prequalified Welding Procedure Specifications (WPS) are prepared by the contractor/fabricator. This means that the contractor or fabricator is responsible for developing and documenting the welding procedures that will be used for a specific project. This includes determining the appropriate welding techniques, materials, and parameters to ensure the quality and integrity of the welds. The contractor/fabricator plays a crucial role in ensuring that the welding procedures meet the required standards and specifications.Rate this question:
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- 22.
All welding symbol information referring to the arrow side of the joint is found?
- A.
Below the reference line
- B.
Above the reference line
- C.
To the left of the welding symbol
- D.
In the tail
Correct Answer
A. Below the reference lineExplanation
The welding symbol information referring to the arrow side of the joint is found below the reference line. This is because the reference line represents the joint, and the arrow side of the joint is the side where the weld is to be made. Therefore, any information related to the welding process, such as weld size, length, or specific instructions, is typically indicated below the reference line to clearly specify the requirements for that particular side of the joint.Rate this question:
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- 23.
D1.5 is the ______________Code.
- A.
Structural Steel
- B.
Reinforcing Steel
- C.
Sheet/Light Gage
- D.
Bride Welding
Correct Answer
D. Bride Welding -
- 24.
What is the maximum fillet weld size for 7/16" thick lap joint?
- A.
1/16"
- B.
1/4"
- C.
3/8"
- D.
5/16"
Correct Answer
C. 3/8"Explanation
7/16" - 1/16" = 6/16" reduce to lowest terms = 3/8"Rate this question:
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- 25.
The legend for figures 3.2 & 3.3 does not cover?
- A.
Preheat & interpass temperature
- B.
Base metal thickness & penetration
- C.
Joint information
- D.
Backing information
Correct Answer
A. Preheat & interpass temperatureExplanation
The legend for figures 3.2 & 3.3 does not cover preheat and interpass temperature. The legend typically provides information about the symbols or colors used in the figures to represent certain variables or conditions. In this case, the legend does not include any indication of how preheat and interpass temperature are represented in the figures. This means that the figures do not provide information about these important variables, which could be crucial for understanding the welding process being depicted.Rate this question:
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- 26.
Down hand welding is another term for?
- A.
Horizontal
- B.
Vertical
- C.
Overhead
- D.
Flat
Correct Answer
D. FlatExplanation
Down hand welding refers to a welding technique where the weld is performed in a horizontal position, with the welder's hand moving downwards. This technique is commonly used for welding in the flat position, where the weld is performed on a horizontal surface. Therefore, the term "down hand welding" is synonymous with the flat position.Rate this question:
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- 27.
Which F group is the electrode used in the D1.1 practical exam classified in?
- A.
F4
- B.
F3
- C.
F2
- D.
F1
Correct Answer
A. F4Explanation
The electrode used in the D1.1 practical exam is classified in F4 group.Rate this question:
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- 28.
Which F group is an E7024 considered?
- A.
F2
- B.
F3
- C.
F1
- D.
F4
Correct Answer
C. F1Explanation
An E7024 is considered to be in the F1 group.Rate this question:
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- 29.
The electrode classification EXXT-1 thru EXXT-6 requires to be run on which polarity?
- A.
Any
- B.
DCEN
- C.
DCEP
- D.
AC
Correct Answer
C. DCEPExplanation
The electrode classification EXXT-1 thru EXXT-6 requires to be run on DCEP (Direct Current Electrode Positive) polarity. DCEP polarity means that the electrode is connected to the positive terminal of the power source, while the workpiece is connected to the negative terminal. This polarity is commonly used for electrodes that have a heavy coating, such as EXXT-1 thru EXXT-6, as it helps to provide better arc stability and penetration.Rate this question:
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Jun 17, 2024Quiz Edited by
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