HV Exit Exam • Set 5 Question 9 of 30

The phenomenon of corona discharge on power transmission conductors is typically accompanied by:

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Direct Answer

Option B: A continuous hissing or crackling noise and ozone smell

Corona produces a characteristic hissing/buzzing acoustic sound due to rapid localized ionization and produces ozone (O3) with its distinct pungent odor.

All Options

A loud explosive detonation

A continuous hissing or crackling noise and ozone smell (Correct Answer)

Mechanical vibration of the deck plates

Magnetic hum only

Detailed Explanation & Context

Corona produces a characteristic hissing/buzzing acoustic sound due to rapid localized ionization and produces ozone (O3) with its distinct pungent odor.

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

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