HV Exit Exam • Set 3 Question 4 of 30
In air blast circuit breakers, the compressed air pressure used for arc quenching is in the order of:
✓
Direct Answer
Option C: 20 to 30 kg/cm²
Air blast circuit breakers (ABCB) utilize high-pressure dry air at approximately 20 to 30 kg/cm² (2 to 3 MPa / 20 to 30 bar) directed across the contacts to rapidly cool and deionize the arc.
All Options
A
100 mm Hg
B
1 kg/cm²
C
20 to 30 kg/cm²
(Correct Answer)
D
200 to 300 kg/cm²
Detailed Explanation & Context
Air blast circuit breakers (ABCB) utilize high-pressure dry air at approximately 20 to 30 kg/cm² (2 to 3 MPa / 20 to 30 bar) directed across the contacts to rapidly cool and deionize 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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