HV Exit Exam • Set 7 Question 19 of 30
For electrical circuit breaker and switch contacts, which of the following parameters should ideally have the lowest possible value?
✓
Direct Answer
Option A: Electrical contact resistance
Low contact resistance is essential to prevent excessive I²R heating and thermal runaway, while high thermal conductivity, high heat capacity, and high erosion resistance are desired.
All Options
A
Electrical contact resistance
(Correct Answer)
B
Thermal heat capacity
C
Thermal conductivity
D
Arc erosion resistance
Detailed Explanation & Context
Low contact resistance is essential to prevent excessive I²R heating and thermal runaway, while high thermal conductivity, high heat capacity, and high erosion resistance are desired.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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