CWB 2 All Module Exams 2025
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
Which type of welding power source is used for the SMAW process?
A) Constant Current
B) Constant Voltage
C) Pulsed Current
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,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
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
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, 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
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
B) Can respond very quickly to correct any changed in the welding circuits
C) Can utilize advanced pulsed waveforms to allow out of position welding using spray
transfer
D) All of the above - ANSWER✔✔-D) All of the above
It would be correct to say:
A) Expansion and contraction are proportional to the dimensions of the heated area
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 3
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
Which type of welding power source is used for the SMAW process?
A) Constant Current
B) Constant Voltage
C) Pulsed Current
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 1
,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
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
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 2
, 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
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
B) Can respond very quickly to correct any changed in the welding circuits
C) Can utilize advanced pulsed waveforms to allow out of position welding using spray
transfer
D) All of the above - ANSWER✔✔-D) All of the above
It would be correct to say:
A) Expansion and contraction are proportional to the dimensions of the heated area
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 3
