HV Exit Exam • Set 7 Question 17 of 30
The arc voltage developed across the separating contacts of an AC circuit breaker during arc burning is:
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Direct Answer
Option C: Substantially in phase with the arc current
Because an electric arc behaves predominantly as a non-linear resistive plasma column, the voltage across the arc is in phase with the arc current.
All Options
A
Leading the arc current by 90°
B
Lagging the arc current by 90°
C
Substantially in phase with the arc current
(Correct Answer)
D
In phase opposition (180°) to the arc current
Detailed Explanation & Context
Because an electric arc behaves predominantly as a non-linear resistive plasma column, the voltage across the arc is in phase with the arc current.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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