CWB 2 All Module Exams 2026
Questions and Answers
A Plasma is:
A) A gas made up of positive ions and free electrons
B) A liquid used to reduce adherence of spatter
C) The main component in an inverter power source
D) Always present in an electrical circuit - Answer -A) A gas made up of positive
ions and free electrons
To increase melting rate (burn-off rate) in the shielded metal arc welding (SMAW)
process, which polarity should be used?
A) DCEP
B) ACEP
C) DCEN
D) ACEP - Answer -C) DCEN
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,Which type of welding power source is used for the SMAW process?
A) Constant Current
B) Constant Voltage
C) Pulsed Current
D) Pulsed Voltage - Answer -A) Constant Current
The purpose of a drooping welding power source is to produce:
A) Constant voltage regardless of the current demand
B) Constant arc length regardless of current
C) Nearly constant current regardless of voltage fluctuations
B) Low open circuit voltage - Answer -C) Nearly constant current regardless of
voltage fluctuations
A self-regulating welding arc is produced by a:
A) Constant current power source with a constant speed wire feed system
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,B) Constant voltage power source with a voltage sensing wire feed system
C) Constant current power source
D) Constant voltage power source with a constant speed wire feed system - Answer
-D) Constant voltage power source with a constant speed wire feed system
Short circuit current is determined by the:
A) Voltage in the circuit
B) Static characteristic of the power source
C) Position of welding
D) Skill of the welder - Answer -B) Static characteristic of the power source
A Transformer is a device that:
A) Transforms AC to DC
B) Works only to change a DC voltage
C) Changes the value of an AC voltage but does not change the frequency
D) Is made from a semiconductor - Answer -C) Changes the value of an AC
voltage but does not change the frequency
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, A Rectifier is a device that converts:
A) DC current to AC current
B) AC Current to a high value DC current
C) DC current to a high value DC current
D) AC current to DC current - Answer -D) AC current to DC current
Microprocessor controls are used in the more modern welding power sources to:
A) Provide more sophisticated levels of control for the welding system
B) Allow welding variables to be stored for use later
C) Provide feedback control
D) All of the above - Answer -D) All of the above
Inverter welding power sources provide increased control over the welding arc
because they:
A) Utilize feedback control
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Questions and Answers
A Plasma is:
A) A gas made up of positive ions and free electrons
B) A liquid used to reduce adherence of spatter
C) The main component in an inverter power source
D) Always present in an electrical circuit - Answer -A) A gas made up of positive
ions and free electrons
To increase melting rate (burn-off rate) in the shielded metal arc welding (SMAW)
process, which polarity should be used?
A) DCEP
B) ACEP
C) DCEN
D) ACEP - Answer -C) DCEN
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,Which type of welding power source is used for the SMAW process?
A) Constant Current
B) Constant Voltage
C) Pulsed Current
D) Pulsed Voltage - Answer -A) Constant Current
The purpose of a drooping welding power source is to produce:
A) Constant voltage regardless of the current demand
B) Constant arc length regardless of current
C) Nearly constant current regardless of voltage fluctuations
B) Low open circuit voltage - Answer -C) Nearly constant current regardless of
voltage fluctuations
A self-regulating welding arc is produced by a:
A) Constant current power source with a constant speed wire feed system
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,B) Constant voltage power source with a voltage sensing wire feed system
C) Constant current power source
D) Constant voltage power source with a constant speed wire feed system - Answer
-D) Constant voltage power source with a constant speed wire feed system
Short circuit current is determined by the:
A) Voltage in the circuit
B) Static characteristic of the power source
C) Position of welding
D) Skill of the welder - Answer -B) Static characteristic of the power source
A Transformer is a device that:
A) Transforms AC to DC
B) Works only to change a DC voltage
C) Changes the value of an AC voltage but does not change the frequency
D) Is made from a semiconductor - Answer -C) Changes the value of an AC
voltage but does not change the frequency
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, A Rectifier is a device that converts:
A) DC current to AC current
B) AC Current to a high value DC current
C) DC current to a high value DC current
D) AC current to DC current - Answer -D) AC current to DC current
Microprocessor controls are used in the more modern welding power sources to:
A) Provide more sophisticated levels of control for the welding system
B) Allow welding variables to be stored for use later
C) Provide feedback control
D) All of the above - Answer -D) All of the above
Inverter welding power sources provide increased control over the welding arc
because they:
A) Utilize feedback control
©COPYRIGHT 2025, ALL RIGHTS RESERVED 4
