HV Exit Exam • Set 3 Question 20 of 30
On high-voltage positive polarity conductors at elevated pressures, corona discharge visually appears as a:
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Direct Answer
Option A: Uniform bluish-white glowing sheath
Positive corona produces a smooth, uniform bluish-violet/white glow around the conductor surface, whereas negative corona forms concentrated reddish or purplish glowing tufts/spots.
All Options
A
Uniform bluish-white glowing sheath
(Correct Answer)
B
Reddish glowing spot
C
Uniform greenish spot
D
Yellow pulsating flame
Detailed Explanation & Context
Positive corona produces a smooth, uniform bluish-violet/white glow around the conductor surface, whereas negative corona forms concentrated reddish or purplish glowing tufts/spots.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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