HV Exit Exam • Set 5 Question 17 of 30

Which of the following gases is most extensively used as the dielectric and arc-quenching medium in modern sealed High Voltage switchgear?

✓

Direct Answer

Option C: Sulphur Hexafluoride (SF6)

SF6 is widely used in Gas-Insulated Switchgear (GIS) and high-voltage circuit breakers due to its superior dielectric strength and rapid arc-quenching recombination properties.

All Options

Nitrogen

Carbon dioxide

Sulphur Hexafluoride (SF6) (Correct Answer)

Argon

Detailed Explanation & Context

SF6 is widely used in Gas-Insulated Switchgear (GIS) and high-voltage circuit breakers due to its superior dielectric strength and rapid arc-quenching recombination properties.

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

Practice Full HV Set 5

Test yourself with 30 interactive questions, live timer, and instant score.

Launch Practice Simulator →

Question Discussion & Notes

Have a doubt, memory trick, or exam update? Share your insights with fellow mariners.

Loading mariner discussions...

« Previous Question Next Question »

More Questions in HV Set 5

View All 30 →

Q1 In electrical safety standards (such as NFPA 70E), crossing the Prohibited Approach Boundary is considered equivalent to making direct: Q2 Under standard electrical installation codes, the minimum allowable clear workspace depth in front of electrical switchboards and control gear is typically: Q3 The secondary winding of an energized Current Transformer (CT) must never be _______ while the primary is carrying current. Q4 What range of 50/60 Hz AC electrical current flowing through the human body is generally recognized as the 'can't let go' threshold (tetanic muscle contraction)? Q5 When performing high-voltage testing using portable instruments, proving the voltmeter (live-dead-live check) is mandatory on all voltage levels above: Q6 Which of the following is a generally recognized primary hazard of working on High Voltage electrical systems? Q7 High-voltage insulating rubber gloves used for electrical protection must undergo routine electrical dielectric re-testing at least every: Q8 Corona discharge on high-voltage conductors in darkness is visually identified by a: Q9 The phenomenon of corona discharge on power transmission conductors is typically accompanied by: Q10 A Tesla coil is fundamentally classified as a: