engineering recuitment PGCIL Diploma Trainee Mock Test 2024 Electrician and Wireman Power Systems Circuit Breakers
Which of the following statements is true regarding the sulfur hexafluoride (SF6) circuit breaker?
1
SF6 is a unstable gas.
2
The dielectric power of SF6 gas is much better than that of air.
3
This is an oil based circuit breaker.
4
This is a very weak arc extinction.