Oil Circuit Breaker - MCQs with answersQ1. When does the arc interruption in oil circuit breaker take place?
a. Contacts apart.
b. Voltages becomes zero
c. Current goes through zero
d. All of the aboveView Answer / Hide Answer
Q2. What is the advantage of using oil as the arc quenching medium?
ANSWER: c. Current goes through zero
a. Good cooling properties.
b. High dielectric strength.
c. Acts as an insulator.
d. All of these.View Answer / Hide AnswerQ3. What is the main purpose of oil in oil circuit breakers?
a. Provide insulation
b. Quenching arc.
c. Provide cooling of contacts.
d. None of the aboveView Answer / Hide Answer
4. What is/are the main disadvantage(s) of using oil as the quenching medium in the circuit breakers?
ANSWER: b. Quenching arc.
a. Need periodical replacement.
b. Risk of formation of explosive mixture with air.
c. Possibility of causing fire hazards.
d. All of the above.View Answer / Hide Answer
5. A three phase, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3s. What is its symmetrical breaking current?
ANSWER: d. All of the above.
a. 1200 A
b. 3600 A
c. 35 kA
d. 104.8 kAView Answer / Hide Answer