HV Exit Exam • Set 6 Question 2 of 30

When a gas is heated or electrically energized into the 'plasma' state, it:

✓

Direct Answer

Option B: Becomes highly electrically conductive due to free electrons and ions

Plasma consists of a quasi-neutral gas of free ions and electrons, making it an excellent electrical conductor that sustains the electric arc in circuit breakers.

All Options

Loses electrical conductivity completely

Becomes highly electrically conductive due to free electrons and ions (Correct Answer)

Acts as a perfect dielectric insulator

Freezes into a crystalline structure

Detailed Explanation & Context

Plasma consists of a quasi-neutral gas of free ions and electrons, making it an excellent electrical conductor that sustains the electric arc in circuit breakers.

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: