CWB Level 2 Study Modules 4-5-6-7-8-9-
12-17-18-19-22 Exam 2026 Questions and
Answers
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
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,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
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,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 onland 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
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, 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
D. 6 minutes at rated output followed by 4 minutes at rest - Answer -D. 6 minutes
at rated output followed by 4 minutes at rest
The DC output of a single phase power supply can be "ripply" and does not
produce
the friendliest DC arc. How is this problem overcome?
A. single phase power supplies produce the smoothest DC of all common machines
B. a third transformer is added to the output circuit to filter out instability
C. a capacitor or capacitor bank is added to the output circuit
D. a 'dual' rectifier bridge is used to filter the transformer output - Answer -C. a
capacitor or capacitor bank is added to the output circuit
©COPYRIGHT 2025, ALL RIGHTS RESERVED 4
12-17-18-19-22 Exam 2026 Questions and
Answers
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
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,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
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,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 onland 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
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, 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
D. 6 minutes at rated output followed by 4 minutes at rest - Answer -D. 6 minutes
at rated output followed by 4 minutes at rest
The DC output of a single phase power supply can be "ripply" and does not
produce
the friendliest DC arc. How is this problem overcome?
A. single phase power supplies produce the smoothest DC of all common machines
B. a third transformer is added to the output circuit to filter out instability
C. a capacitor or capacitor bank is added to the output circuit
D. a 'dual' rectifier bridge is used to filter the transformer output - Answer -C. a
capacitor or capacitor bank is added to the output circuit
©COPYRIGHT 2025, ALL RIGHTS RESERVED 4
