HV Exit Exam • Set 5 Question 21 of 30
All of the following are desirable properties of an insulating dielectric gas EXCEPT:
✓
Direct Answer
Option C: Extremely low molecular weight and low electron affinity
Effective dielectric gases (like SF6) require high molecular weight and high electronegativity (high electron affinity) to capture free electrons and suppress electron avalanches.
All Options
A
High dielectric breakdown strength
B
Chemical and physiological inertness
C
Extremely low molecular weight and low electron affinity
(Correct Answer)
D
High thermal conductivity and non-flammability
Detailed Explanation & Context
Effective dielectric gases (like SF6) require high molecular weight and high electronegativity (high electron affinity) to capture free electrons and suppress electron avalanches.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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