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| Q. |
When a fault occurs in a high voltage transmission line, what happens first? |
| A. | Circuit breaker operates then the relay. |
| B. | Relay operates and then the circuit breaker. |
| C. | Relay operates, then successively the isolator and the circuit breaker. |
| D. | Isolator operates, then successively the relay and the circuit breaker. |
| Answer» B. Relay operates and then the circuit breaker. | |
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