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- Subject
- Switchgear and Protectionelectrical-engineering-mcqs › switchgear-and-protection
- Published
- 17 Dec 2018
- Last updated
- 28 May 2026
Explanation
Air blast circuit breakers for 400 kV systems are engineered to function with an operating time around 50 milliseconds, which ensures rapid interruption of fault currents. Other listed times such as 100 microseconds or 0.5 seconds are either too fast or too slow for typical air blast circuit breaker operation at this voltage level.
More Switchgear and Protection MCQs
Practice related questions from the same subject.
- 1.What causes a fuse to blow?
- 2.Compared to a rewirable fuse, what advantages does an H.R.C. fuse offer?
- 3.Where is an isolator typically placed in relation to a circuit breaker?
- 4.Fuses are typically not employed for protection in circuits with current ratings exceeding which value?
- 5.Oil circuit breakers are primarily used in which type of electrical circuits?
- 6.What type of fault does a fuse in a motor circuit primarily protect against?
- 7.Which phenomenon caused by electric current is responsible for the operation of a fuse?
- 8.The rating of a fuse is specified based on which electrical parameter?
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