HV Exit Exam • Set 5 Question 15 of 30

Compared to dry air at atmospheric pressure, the relative dielectric strength of Sulphur Hexafluoride (SF6) gas is approximately:

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Direct Answer

Option B: 2.5 to 3.0 times

SF6 gas has an electronegative molecular structure that captures free electrons, giving it a dielectric breakdown strength roughly 2.5 to 3 times that of air at identical pressure.

All Options

1.0 times

2.5 to 3.0 times (Correct Answer)

10.0 times

50.0 times

Detailed Explanation & Context

SF6 gas has an electronegative molecular structure that captures free electrons, giving it a dielectric breakdown strength roughly 2.5 to 3 times that of air at identical pressure.

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

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