Which of the following circuit breakers has high reliability & minimum maintenance? (A) Bulk oil type CB (B) Air blast CB (C) Vacuum CB (D) Sulphur hexafluoride CB Answer : Which of the following circuit breakers has high reliability & minimum maintenance? (A) Bulk oil type CB (B) Air blast CB (C) Vacuum CB (D) Sulphur hexafluoride CB ...
The following is/are the characteristics of SF6 circuit breakers: (A) It does not need an auxiliary breaking chamber (B) Short break time of 2 to 2.5 cycles (C) All of the above (D) None of the above Answer : The following is/are the characteristics of SF6 circuit breakers: (A) It does not need an auxiliary breaking chamber (B) Short break time of 2 to 2.5 cycles (C) All of the above (D) None of the above ...
Magnetic circuit breakers use _________ A) Permanent magnets B) Earth magnets C) Solenoid D) All the above Answer : Magnetic circuit breakers use Solenoid ...
Answer : Air blast circuit breakers for 400 kV power system are designed to operate in 50 millisecond. ...
Answer : The time of closing the cycle, in modern circuit breakers is 0.003 sec. ...
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