CWB Level 2 All Modules Exam| Updated
2026/2027| A Review of 474 Real Past Exam
Questions and Correct Verified Answers|
Document Replicates the Actual Exam
Format| Guaranteed Pass (Brand New!!)
In GTAW, the high frequency unit increases the incoming AC line voltage to
several thousand volts. Select the correct statement.
A. Systems are limited to less than 4,000 volts for safety reasons
B. The spark gap needs to be at least 75mm (3") wide for the spark to create the arc
C. High frequency systems output high voltage but only at low current flow
D. High frequency systems only work with inverter based direct current arcs -
ANSWER✔️-C. High frequency systems output high voltage but only at low
current flow
How is a thyristor or SCR (silicon controlled rectifier) turned on?
A. By reversing current through the junction
B. By a signal called a "gate pulse"
C. SCR's must be switched mechanically
D. By a capacitor linked to a high frequency generator - ANSWER✔️-B. By a
signal called a "gate pulse"
If a transformer secondary coil has fewer turns than the primary coil, it is described
as;
A. An autotransformer
B. A step-up transformer
C. A step-down transformer
D. A rectifying transformer - ANSWER✔️-C. A step-down transformer
Conventional transformer-rectifiers;
A. Convert high frequency current into lower voltage output
B. Convert alternating current into direct current at lower than line voltage
C. Convert low voltage direct current into high frequency alternating current
D. Convert high voltage alternating current into low voltage, high frequency direct
current - ANSWER✔️-D. Convert high voltage alternating current into low
voltage, high frequency direct current
,Name the two main methods of arc shielding. - ANSWER✔️-Flux shielding and
gas shielding.
In which direction do the electrons flow in an electrical arc? From anode to
cathode, or cathode to anode? - ANSWER✔️-Cathode to anode.
In arc welding, the electric arc is intensely hot with temperatures exceeding: -
ANSWER✔️-30000°C
Which arc welding process has the highest arc efficiency? And what is its
Approximate value? - ANSWER✔️-Submerged arc welding. 90 top 95%.
How do the arc voltage and arc stiffness change when the arc length is increased? -
ANSWER✔️-Arc voltage increases and arc stiffness decreases.
What is the generic name for the electrode used in GTAW and does it melt to
provide filler metal for the weld? - ANSWER✔️-Tungsten electrode.
In the GTAW process what type of penetration and weld width can be expected
when using D.C. electrode positive? - ANSWER✔️-Shallow penetration and a
wide weld.
Which polarity is chosen most often for direct current GTAW welding of steels and
why? - ANSWER✔️-Direct current electrode negative. More heat is produced at
the workpiece leading to Deeper weld penetration.
Why must the shielding gas for GTAW be completely inert? - ANSWER✔️-
Presence of active gases like oxygen and carbon dioxide will oxidize the tungsten
Electrode and limit its life.
State two advantages of the GTAW process. - ANSWER✔️-It gives high quality
deposits, and the process can be used to weld virtually all metals
And alloys.
When ultrasonic testing an electroslag weld in the as-welded condition, what
difficulty might be encountered?
A. The large grain size makes it easier to inspect than welds made by other welding
,Processes
B. The large grain size makes it difficult to inspect and low frequencies are
preferred
C. It is the same as any other types of welds
D. The reinforcements must be removed before it is possible to inspect
E. If higher frequency is used it will be the same as UT of other types of welds -
ANSWER✔️-B. The large grain size makes it difficult to inspect and low
frequencies are preferred
What is the wavelength of a 20 khz sound wave traveling in steel with a velocity
5.85 x
103 m/s?
A. 3.42 mm
B. 293 mm
C. 3.42 m
D. 2.93 mm
E. 117 mm - ANSWER✔️-B. 293 mm
During arc welding there is a zone adjacent to the weld metal that reaches high
temperatures but does not melt. What is the name of this region? - ANSWER✔️-
Heat Affect Zone (HAZ)
In parallel electrical circuits, the voltage across each resistor is the same since each
path is connected to the same voltage source. Select the correct statement.
A. In each parallel path the resistance must be equalized to create equal voltage.
B. The current flowing in each parallel path must be the same as the voltage.
C. The current flowing in each parallel path depends on the resistance in each path
D. The current flowing in each parallel path depends on the capacitance in each
path - ANSWER✔️-C. The current flowing in each parallel path depends on the
resistance in each path
Welding is a joining process that by definition requires: - ANSWER✔️-The
application of either heat or pressure
The duty cycle of a welding power supply is based upon delivering its rated output
for a given number of minutes. Which of the following statements is correct.
A. A 300 amp/60% duty cycle machine is rated to deliver 300 amps for 6 minutes
in a ten minute period
, B. A 300 amp/30% duty cycle machine is rated to deliver 300 amps in a ten minute
period
C. A 250 amp/30% duty cycle machine is rated to deliver 250 amps for 30 minutes
separated by 10 minutes at rest
D. A 300 amp/60% duty cycle machine is rated to deliver 500 amps maximum for
6 minutes in a ten minute period - ANSWER✔️-A. A 300 amp/60% duty cycle
machine is rated to deliver 300 amps for 6 minutes in a ten minute period
Conventional transformer-rectifiers;
A. Convert direct current into alternating current
B. Convert alternating current into direct current
C. Convert alternating current into pulsed current
D. Convert direct current into pulsed current - ANSWER✔️-B. Convert alternating
current into direct current
A conventional diode placed in a circuit allows the passage of current in one
direction only. A silicon controlled rectifier(SCR) operates slightly differently.
How does it work?
A. An SCR conducts current in both directions until turned on and current flow is
then prevented
B. An SCR is non-conductive until turned on land then allows current to flow in
both directions
C. An SCR is non-conductive until turned on, allowing current to flow in one
direction only until the flow of current stops
D. An SCR is a unique rectifying device which allows only alternating c1:1rrent to
flow until turned off - ANSWER✔️-C. An SCR is non-conductive until turned on,
allowing current to flow in one direction only until the flow of current stops
What is the term for voltage measured across the output terminals of a welding
Machine when no current is being drawn?
A. Diode voltage
B. Operating voltage
C. Open circuit voltage
D. Terminal voltage - ANSWER✔️-C. Open circuit voltage
A 60% duty cycle means that the power supply can deliver its rated output for:
A 60% of the rated output only
B. 60% over the rated output followed by 4 minutes at rest
C. 6 minutes at rest followed by 4 minutes at rated output
2026/2027| A Review of 474 Real Past Exam
Questions and Correct Verified Answers|
Document Replicates the Actual Exam
Format| Guaranteed Pass (Brand New!!)
In GTAW, the high frequency unit increases the incoming AC line voltage to
several thousand volts. Select the correct statement.
A. Systems are limited to less than 4,000 volts for safety reasons
B. The spark gap needs to be at least 75mm (3") wide for the spark to create the arc
C. High frequency systems output high voltage but only at low current flow
D. High frequency systems only work with inverter based direct current arcs -
ANSWER✔️-C. High frequency systems output high voltage but only at low
current flow
How is a thyristor or SCR (silicon controlled rectifier) turned on?
A. By reversing current through the junction
B. By a signal called a "gate pulse"
C. SCR's must be switched mechanically
D. By a capacitor linked to a high frequency generator - ANSWER✔️-B. By a
signal called a "gate pulse"
If a transformer secondary coil has fewer turns than the primary coil, it is described
as;
A. An autotransformer
B. A step-up transformer
C. A step-down transformer
D. A rectifying transformer - ANSWER✔️-C. A step-down transformer
Conventional transformer-rectifiers;
A. Convert high frequency current into lower voltage output
B. Convert alternating current into direct current at lower than line voltage
C. Convert low voltage direct current into high frequency alternating current
D. Convert high voltage alternating current into low voltage, high frequency direct
current - ANSWER✔️-D. Convert high voltage alternating current into low
voltage, high frequency direct current
,Name the two main methods of arc shielding. - ANSWER✔️-Flux shielding and
gas shielding.
In which direction do the electrons flow in an electrical arc? From anode to
cathode, or cathode to anode? - ANSWER✔️-Cathode to anode.
In arc welding, the electric arc is intensely hot with temperatures exceeding: -
ANSWER✔️-30000°C
Which arc welding process has the highest arc efficiency? And what is its
Approximate value? - ANSWER✔️-Submerged arc welding. 90 top 95%.
How do the arc voltage and arc stiffness change when the arc length is increased? -
ANSWER✔️-Arc voltage increases and arc stiffness decreases.
What is the generic name for the electrode used in GTAW and does it melt to
provide filler metal for the weld? - ANSWER✔️-Tungsten electrode.
In the GTAW process what type of penetration and weld width can be expected
when using D.C. electrode positive? - ANSWER✔️-Shallow penetration and a
wide weld.
Which polarity is chosen most often for direct current GTAW welding of steels and
why? - ANSWER✔️-Direct current electrode negative. More heat is produced at
the workpiece leading to Deeper weld penetration.
Why must the shielding gas for GTAW be completely inert? - ANSWER✔️-
Presence of active gases like oxygen and carbon dioxide will oxidize the tungsten
Electrode and limit its life.
State two advantages of the GTAW process. - ANSWER✔️-It gives high quality
deposits, and the process can be used to weld virtually all metals
And alloys.
When ultrasonic testing an electroslag weld in the as-welded condition, what
difficulty might be encountered?
A. The large grain size makes it easier to inspect than welds made by other welding
,Processes
B. The large grain size makes it difficult to inspect and low frequencies are
preferred
C. It is the same as any other types of welds
D. The reinforcements must be removed before it is possible to inspect
E. If higher frequency is used it will be the same as UT of other types of welds -
ANSWER✔️-B. The large grain size makes it difficult to inspect and low
frequencies are preferred
What is the wavelength of a 20 khz sound wave traveling in steel with a velocity
5.85 x
103 m/s?
A. 3.42 mm
B. 293 mm
C. 3.42 m
D. 2.93 mm
E. 117 mm - ANSWER✔️-B. 293 mm
During arc welding there is a zone adjacent to the weld metal that reaches high
temperatures but does not melt. What is the name of this region? - ANSWER✔️-
Heat Affect Zone (HAZ)
In parallel electrical circuits, the voltage across each resistor is the same since each
path is connected to the same voltage source. Select the correct statement.
A. In each parallel path the resistance must be equalized to create equal voltage.
B. The current flowing in each parallel path must be the same as the voltage.
C. The current flowing in each parallel path depends on the resistance in each path
D. The current flowing in each parallel path depends on the capacitance in each
path - ANSWER✔️-C. The current flowing in each parallel path depends on the
resistance in each path
Welding is a joining process that by definition requires: - ANSWER✔️-The
application of either heat or pressure
The duty cycle of a welding power supply is based upon delivering its rated output
for a given number of minutes. Which of the following statements is correct.
A. A 300 amp/60% duty cycle machine is rated to deliver 300 amps for 6 minutes
in a ten minute period
, B. A 300 amp/30% duty cycle machine is rated to deliver 300 amps in a ten minute
period
C. A 250 amp/30% duty cycle machine is rated to deliver 250 amps for 30 minutes
separated by 10 minutes at rest
D. A 300 amp/60% duty cycle machine is rated to deliver 500 amps maximum for
6 minutes in a ten minute period - ANSWER✔️-A. A 300 amp/60% duty cycle
machine is rated to deliver 300 amps for 6 minutes in a ten minute period
Conventional transformer-rectifiers;
A. Convert direct current into alternating current
B. Convert alternating current into direct current
C. Convert alternating current into pulsed current
D. Convert direct current into pulsed current - ANSWER✔️-B. Convert alternating
current into direct current
A conventional diode placed in a circuit allows the passage of current in one
direction only. A silicon controlled rectifier(SCR) operates slightly differently.
How does it work?
A. An SCR conducts current in both directions until turned on and current flow is
then prevented
B. An SCR is non-conductive until turned on land then allows current to flow in
both directions
C. An SCR is non-conductive until turned on, allowing current to flow in one
direction only until the flow of current stops
D. An SCR is a unique rectifying device which allows only alternating c1:1rrent to
flow until turned off - ANSWER✔️-C. An SCR is non-conductive until turned on,
allowing current to flow in one direction only until the flow of current stops
What is the term for voltage measured across the output terminals of a welding
Machine when no current is being drawn?
A. Diode voltage
B. Operating voltage
C. Open circuit voltage
D. Terminal voltage - ANSWER✔️-C. Open circuit voltage
A 60% duty cycle means that the power supply can deliver its rated output for:
A 60% of the rated output only
B. 60% over the rated output followed by 4 minutes at rest
C. 6 minutes at rest followed by 4 minutes at rated output
