HV Exit Exam • Set 6 Question 8 of 30

The medium employed for arc extinction in an Air Circuit Breaker (ACB) is:

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Direct Answer

Option C: Atmospheric air directed through arc splitter chutes

Air Circuit Breakers (ACBs) interrupt current in atmospheric air using magnetic blowout coils and arc chute splitters that lengthen, cool, and extinguish the arc.

All Options

Sulphur Hexafluoride (SF6)

De-aerated mineral oil

Atmospheric air directed through arc splitter chutes (Correct Answer)

Deionized distilled water

Detailed Explanation & Context

Air Circuit Breakers (ACBs) interrupt current in atmospheric air using magnetic blowout coils and arc chute splitters that lengthen, cool, and extinguish the arc.

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

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Q1 In standard high-voltage measuring sphere gaps, the precision spheres are manufactured from: Q2 When a gas is heated or electrically energized into the 'plasma' state, it: Q3 Which of the following statements concerning corona discharge on power transmission lines is INCORRECT? Q4 A high-voltage circuit breaker is fundamentally designed as a: Q5 The primary function of a protective relay in a power circuit breaker protection scheme is to: Q6 Under standard electrical terminology and IEC standards, Low Voltage (LV) circuit breakers have a rated operating voltage of up to: Q7 The total fault clearing time of a modern high-speed high-voltage circuit breaker (relay time plus breaker opening and arcing time) is typically: Q8 The medium employed for arc extinction in an Air Circuit Breaker (ACB) is: Q9 Which of the following circuit breaker technologies is most widely preferred for Extra High Voltage (EHV/UHV) grid transmission substations? Q10 According to IEC standard specifications, the rated short-time withstand current (thermal short-circuit rating) for HV AC circuit breakers is rated for a duration of: