HV Exit Exam • Set 6 Question 25 of 30

Which of the following liquids presents definite technical objections to being used as an arc-extinguishing medium in high-voltage circuit breakers?

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Direct Answer

Option D: Water (due to high electrical conductivity and intense hydrogen dissociation)

Water has high natural conductivity, causes rapid corrosion, and dissociates into explosive hydrogen and oxygen gases when exposed to high-voltage electric arcs.

All Options

Mineral dielectric oil

Synthetic ester oil

Silicone oil

Water (due to high electrical conductivity and intense hydrogen dissociation) (Correct Answer)

Detailed Explanation & Context

Water has high natural conductivity, causes rapid corrosion, and dissociates into explosive hydrogen and oxygen gases when exposed to high-voltage electric arcs.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).

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