TheoryCWENG Test Prep Practice Test Video
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Q1In a constant current (CC) arc welding circuit, what happens to the current when the arc length changes?
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✓ Correct answer: The current remains relatively stable while the voltage changes
Constant current power sources maintain a relatively stable amperage despite changes in arc length, which causes voltage to change instead. This makes them ideal for processes where maintaining consistent amperage is critical, such as SMAW.
Q2What is the function of a rectifier in a DC arc welding power source?
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✓ Correct answer: To convert AC to DC
Rectifiers convert alternating current (AC) to direct current (DC) by allowing current to flow in only one direction, which is essential for DC welding applications.
Q3In welding circuit analysis, what does open circuit voltage (OCV) represent?
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✓ Correct answer: The voltage present when no welding arc is established
Open circuit voltage is the voltage measured across the output terminals of a welding power source when no welding is taking place (no current flowing). It must be high enough to establish an arc but not excessive for safety reasons.
Q4Which of the following best describes a constant voltage (CV) arc welding circuit?
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✓ Correct answer: The power source maintains voltage at a set point while current self-adjusts
In constant voltage circuits, the power source maintains relatively stable voltage while allowing current to vary based on the physical distance between the electrode and workpiece. This self-regulation makes them ideal for GMAW (MIG) welding.
Q5What component in an inverter welding power source allows for high-frequency operation?
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✓ Correct answer: Transistors
Transistors (specifically IGBTs or MOSFETs) in inverter welding power sources rapidly switch the current on and off at high frequencies, allowing for more efficient and compact designs compared to traditional transformer-based power sources.
Q6According to Ohm's Law, what happens to current in a welding circuit if resistance increases while voltage remains constant?
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✓ Correct answer: Current decreases
Ohm's Law (I = V/R) dictates that current is inversely proportional to resistance when voltage is constant. If resistance increases, the current will decrease proportionally.
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